The confidence interval with the smaller margin of error is given as follows:
Plant 500 plots rather than 100, which is the first option.
What is a z-distribution confidence interval?The bounds of the confidence interval, when we know the standard deviation of the population. are given by the rule presented as follows:
[tex]\overline{x} \pm z\frac{\sigma}{\sqrt{n}}[/tex]
In which:
[tex]\overline{x}[/tex] is the sample mean in the problem.z is the critical value of the z-table.n is the sample size.[tex]\sigma[/tex] is the population standard deviation.The margin of error is calculated as follows:
[tex]M = z\frac{\sigma}{\sqrt{n}}[/tex]
The margin of error is inversely proportional to the square root of the sample size, hence increasing the sample size will reduce the margin of error.
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∬Rf(X,Y)DA Where R Is The Region Bounded By The Lines Y=0,X=5 And Y=5x. Select The Corresponding Iterated Integral. Select
The region R is bounded by the lines y = 0, y = 5x, and x = 5, which can be expressed as y = 0, y = 5x, and x = y/5 for y between 5 and 25.
To evaluate the double integral ∬Rf(x,y)dA over the region R bounded by the lines y = 0, x = 5, and y = 5x, we can use an iterated integral.
Since the region is bounded by three lines, we can split it into two subregions using the line y = 5x. We can integrate over each subregion separately and then add the results.
First, let's integrate over the subregion where y varies from 0 to 5x:
∫0^5 ∫0^x f(x,y) dy dx
Next, let's integrate over the subregion where y varies from 0 to 5:
∫0^1 ∫0^5x f(x,y) dy dx
Putting these together, we get the following iterated integral:
∬Rf(x,y)dA = ∫0^5 ∫0^x f(x,y) dy dx + ∫0^1 ∫0^5x f(x,y) dy dx
Note that we can also write this as a single iterated integral by using piecewise functions:
∬Rf(x,y)dA = ∫0^5 ∫0^5x f(x,y) dy dx + ∫5^25 ∫0^(y/5) f(x,y) dx dy
This is because the region R is bounded by the lines y = 0, y = 5x, and x = 5, which can be expressed as y = 0, y = 5x, and x = y/5 for y between 5 and 25.
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if the mean set of normally distributed 200 numbers id
70 and the standard devuatij is 6. approximately what percent of
the numbers will be between 64 and 76
Approximately 68.26% of the numbers in the normally distributed set of 200 numbers, with a mean of 70 and a standard deviation of 6, will fall between 64 and 76.
To solve this problem, we can use the properties of the standard normal distribution, also known as the Z-distribution. Since the given data does not specify whether the original distribution is exactly normal, we assume that it is approximately normal due to the large sample size (n = 200).
First, we need to standardize the values of 64 and 76 using the Z-score formula:
Z = (X - μ) / σ
where Z is the Z-score, X is the value, μ is the mean, and σ is the standard deviation.
For 64:
Z₁ = (64 - 70) / 6 = -1
For 76:
Z₂ = (76 - 70) / 6 = 1
Next, we use the Z-table or a calculator to find the area between Z₁ and Z₂. The Z-table provides the cumulative probability up to a certain Z-score.
From the Z-table or a calculator, we find that the cumulative probability for Z = -1 is approximately 0.1587, and the cumulative probability for Z = 1 is approximately 0.8413.
To find the percentage between Z₁ and Z₂, we subtract the cumulative probability of Z₁ from the cumulative probability of Z₂:
P(Z₁ < Z < Z₂) = P(Z < Z₂) - P(Z < Z₁) = 0.8413 - 0.1587 = 0.6826
So approximately 68.26% of the numbers in the set will fall between 64 and 76.
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I need help on this question ASAP
The solutions to the inequalities are represented as follows:
1. Two less than 3/2 of a number is no less than 51/2
2. The sum of two times a number is at least 8
3. Four added to three times a number is less than 19
4. Seven subtracted from four times a number is more than 13.
How to solve the inequalitiesTo solve the inequalities, we would begin by writing out the word problems as mathematical expressions as follows:
1. 3/2x - 2 ≤ 5 1/2
3/2x ≤ 11/2 + 2
x ≤ 5
2. 2x + -2 ≥ 8
2x - 2 ≥ 8
2x ≥ 8 + 2
2x ≥ 10
x ≥ 5
3. 4x - 7 > 13
4x > 20
x > 5
Given these solutions, we can express the word problems and their solutions in the above ways.
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19. AWXY had points at W(7,1),
X(-2,6), and Y(3,0). It was dilated to
form AW'X'Y' with points at W'(21,3),
X'(-6,18), and Y'(9,0). What scale
factor was used to form AW'X'Y'?
a. k =3
b. k = 5
C. k = 9
d. k = 3
It is not possible to answer the question with the given information.In geometry, a point is an exact position or location on a plane surface. Points are usually labeled with an uppercase letter.
Given:
AWXY had points at W(7,1), d. k = 3To find: The coordinates of point X and Y.The given points in the question are W(7,1) and d. The coordinates of the point d is missing, which makes it impossible to find the coordinates of the points X and Y.
In the coordinate system, the point is represented by its coordinates (x, y).
The coordinates are always listed in the order of the x-coordinate and then the y-coordinate.
To find the coordinates of X and Y, we need to have the coordinates of the point d as well. Please provide the complete question so that we can provide the solution.
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Convert this rational number to its decimal form and round to the nearest thousandth.
1/6
HURRY PLEASE
The conversion of 1/6 to decimal to the nearest thousandth is 0.167
What is decimal and fraction?A decimal is a number that consists of a whole and a fractional part.
Fraction is the number is expressed as a quotient, in which the numerator is divided by the denominator.
Rational numbers are numbers that can be represented as the quotient p/q of two integers such that q ≠ 0.
Converting 1/6 to decimal;
= 0.1666666666..
This will continue but we have to stop at a point.
To the nearest thousandth will be
1/6 = 0.167
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The line tangent to y = f(x) at x = 3 is y = 4x the line tangent to y = g(x) at x = 5 is y = 6x - 27. 92. Compute f(3), f'(3), g(5), and g'(5). 10 and
Since the line tangent to y = f(x) at x = 3 is y = 4x, plugging in x = 3 into this equation gives us:
f(3) = 4 * 3 = 12
To compute the values of f(3), f'(3), g(5), and g'(5), we can use the information given about the tangent lines.
For the function f(x):
We know that the line tangent to y = f(x) at x = 3 is y = 4x.
1. Computing f(3):
Since the line tangent to y = f(x) at x = 3 is y = 4x, plugging in x = 3 into this equation gives us:
f(3) = 4 * 3 = 12
2. Computing f'(3):
The slope of the tangent line y = 4x is 4, which is equal to f'(3), the derivative of f(x) at x = 3. Therefore, f'(3) = 4.
For the function g(x):
We know that the line tangent to y = g(x) at x = 5 is y = 6x - 27.92.
1. Computing g(5):
Since the line tangent to y = g(x) at x = 5 is y = 6x - 27.92, plugging in x = 5 into this equation gives us:
g(5) = 6 * 5 - 27.92 = 2.08
2. Computing g'(5):
The slope of the tangent line y = 6x - 27.92 is 6, which is equal to g'(5), the derivative of g(x) at x = 5. Therefore, g'(5) = 6.
So, the computed values are:
f(3) = 12
f'(3) = 4
g(5) = 2.08
g'(5) = 6
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find the value of an ordinary annuity with deposits of 15169
quarterly for 9 years at 8.8% compounded quarterly
The value of the ordinary annuity with deposits of $15,169 quarterly for 9 years at 8.8% compounded quarterly is approximately $848,820.14. This means that after 9 years of making quarterly deposits, the annuity will grow to a total value of approximately $848,820.14
To find the value of an ordinary annuity with deposits of $15,169 quarterly for 9 years at 8.8% compounded quarterly, we can use the formula for the future value of an ordinary annuity.
The formula is:
A = P * ((1 + r)^n - 1) / r
where A is the future value of the annuity, P is the deposit amount per period, r is the interest rate per period, and n is the number of periods.
In this case, the deposit amount per period is $15,169, the interest rate per period is 8.8% or 0.088, and the number of periods is 9 years multiplied by 4 quarters per year, which gives us 36 quarters.
Plugging these values into the formula, we have:
A = 15169 * ((1 + 0.088)^36 - 1) / 0.088
Calculating this expression, we find that the future value of the annuity is approximately $848,820.14.
Therefore, the value of the ordinary annuity with deposits of $15,169 quarterly for 9 years at 8.8% compounded quarterly is approximately $848,820.14. This means that after 9 years of making quarterly deposits, the annuity will grow to a total value of approximately $848,820.14.
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By applying the substitution t = tan² 0 to B(x, y) = TC 252 (sin 0)2x-1 (cos 0)2y-1 de, show that 0 dt tx-1 B(x, y) = (1+t)x+y [infinity]
B(x, y) = TC 252 (sin 0)2x-1 (cos 0)2y-1
We need to show that 0dt tx-1 B(x, y)
= (1+t)x+y [infinity]
For this, we need to substitute t = tan² 0 in B(x, y).
So, B(x, y) can be written as shown below:
B(x, y) = TC 252 (sin 0)2x-1 (cos 0)2y-1
Now, substitute t = tan² 0 in B(x, y)
So, we have: B(x, y) = TC 252 (sin 0)2x-1 (cos 0)2y-1
= TC 252 (sin 0)2x-1 (cos 0)2y-1(sin²0 + cos²0)
Now, use the identity 1 + tan²0
= sec²0 in sin²0 and cos²0.
We have: B(x, y) = TC 252 [sin2 0 sec² 0 x-1] [cos² 0 sec² 0 y-1]
= TC 252 [tan² 0 sec² 0 x] [sec² 0 y-1]
Now, substitute t = tan² 0 and sec² 0
= 1 + tan² 0 in B(x, y).
We have: B(x, y) = TC 252 [t (1 + t) x-1] [(1 + t) y-1]
= TC 252 t x+y-2 (1+t)
Now, integrate the above expression to obtain the final expression.
0dt tx-1 B(x, y)
= TC 252 t x+y-1 dx (taking t out of the integral)
= TC 252 t x+y-1 dx [1+t] [0, infinity]
= TC 252 [t x+y-1 + t x+y] [0, infinity]
= TC 252 [(t x+y-1 + t x+y)/(x+y)] [0, infinity]
= TC 252 (1+t) x+y-1 [0, infinity]
= (1+t) x+y-1 [infinity]
So, 0dt tx-1 B(x, y)
= (1+t)x+y [infinity
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Find the centroid of the quarter circle \( x^{2}+y^{2} \leq 6, y \geq|x| \) assuming the density \( \delta(x, y)=1 \) (Use symbolic notation and fractions where needed. Give your answer as point coordinates in the form (∗,∗).
The centroid of the quarter circle x² + y² ≤ 6 and y≥ |x| assuming the density function δ(x,y) = 1 is (8√2/3π,8√2/3π).
To find the centroid of the quarter circle x² + y² ≤ 6 and y≥ |x| with a density function δ(x,y) = 1, we need to calculate the following integrals:
[tex]M_x[/tex] = ∬[tex]_R[/tex] x δ(x,y) dA
[tex]M_y[/tex] =∬[tex]_R[/tex] y δ(x,y) dA
A =∬[tex]_R[/tex] δ(x,y) dA
where R is the region defined by the quarter circle x² + y² ≤ 6 and y≥ |x|.
Since the density function is constant δ(x,y) = 1, we can simplify the integrals to:
[tex]M_x[/tex] = ∬[tex]_R[/tex] x dA
[tex]M_y[/tex] =∬[tex]_R[/tex] y dA
A =∬[tex]_R[/tex] dA
To evaluate these integrals, we can use polar coordinates.
In polar coordinates, the region R is described as 0 ≤ r ≤√6 and -π/4 ≤ Θ ≤ π/4.
The differential area element dA in polar coordinates is rdrdθ.
We can now rewrite the integrals in terms of polar coordinates:
[tex]M_x[/tex] = ∬[ -π/4,π/4] [0,√6] (rcosΘ) rdrdΘ
[tex]M_y[/tex] =∬[ -π/4,π/4] [0,√6] (rsinΘ) rdrdΘ
A =∬[ -π/4,π/4] [0,√6] rdrdΘ
Let's evaluate integral:
[tex]M_x[/tex] = ∫ [ -π/4,π/4] [1/3 r³ cosΘ] [0, √6]dΘ
[tex]M_y[/tex] = ∫ [ -π/4,π/4] [1/3 r³ sinΘ] [0, √6]dΘ
A = ∫ [ -π/4,π/4] [1/2 r²] [0, √6]dΘ
After simplifying the limits of integration:
[tex]M_x[/tex] = [ -π/4,π/4] 2/3 sinΘ = 2√2/3
[tex]M_y[/tex] = [ -π/4,π/4] 2/3 cosΘ = 2√2/3
A = [ -π/4,π/4] 1/2 Θ = π/4
Finally, the coordinates of the centroid (x,y) is given by:
x = [tex]M_x[/tex]/A = 8√2/3π
y = [tex]M_y[/tex]/A = 8√2/3π
Therefore, the centroid of the quarter circle is (8√2/3π,8√2/3π).
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The complete question is:
Find the centroid of the quarter circle x² + y² ≤ 6 and y≥ |x| assuming the density function δ(x,y) = 1. (Use symbolic notation and fractions where needed. Give your answer as point coordinates in the form (∗,∗).
A= [k (a) If k= 3, find inverse of A Problem 3. (10 points) Let A= k²2] (b) In general, for which values of k, is the matrix A invertible? Justify your answer.
For all values of k except k = 0, the matrix A will be invertible. This means that any non-zero value of k will make the matrix A invertible.
(a) If k = 3, we can find the inverse of matrix A:
A = [3² 2]
[ k 0]
To find the inverse of A, we can use the formula for a 2x2 matrix:
A⁻¹ = (1/det(A)) * adj(A)
where det(A) represents the determinant of A and adj(A) represents the adjugate of A.
The determinant of A can be calculated as:
det(A) = (3² * 0) - (2 * k) = -2k
Now, let's find the adjugate of A:
adj(A) = [0 2]
[ -k 9]
Finally, we can calculate the inverse of A using the formula mentioned earlier:
A⁻¹ = (1/det(A)) * adj(A)
Substituting the values we found:
A⁻¹ = (1/(-2k)) * [0 2]
[ -k 9]
Simplifying further, we get:
A⁻¹ = [0 -1/(2k)]
[ 1/2 -9/(2k)]
Therefore, when k = 3, the inverse of matrix A is:
A⁻¹ = [0 -1/6]
[ 1/2 -9/6] or [0 -1/6]
[ 1/2 -3/2]
(b) In general, for which values of k is the matrix A invertible?
For a matrix to be invertible, its determinant (det(A)) must be non-zero. This is because the determinant of a matrix is related to its singularity or non-invertibility.
From part (a), we found that the determinant of A is -2k. So, for A to be invertible, we need -2k ≠ 0.
Solving the inequality -2k ≠ 0, we have k ≠ 0.
Therefore, for all values of k except k = 0, the matrix A will be invertible. This means that any non-zero value of k will make the matrix A invertible.
In summary, the matrix A is invertible for all values of k except k = 0. For k = 3, the inverse of A is given by A⁻¹ = [0 -1/6] [ 1/2 -3/2].
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Apply Green's Theorem To Evaluate The Integral. ∮C(3y+X)Dx+(Y+9x)Dy C: The Circle (X−6)2+(Y−1)2=4 ∮C(3y+X)Dx+
Hence, the value of the line integral ∮C (3y+X)dx + (Y+9x)dy over the circle C is 24π.
To apply Green's theorem to evaluate the given line integral ∮C (3y+X)dx + (Y+9x)dy, we first need to express it in terms of a double integral over a region in the xy-plane.
Green's theorem states that for a vector field F = (P, Q) and a simple closed curve C that encloses a region D, the line integral of F along C is equal to the double integral of the curl of F over D:
∮C (Pdx + Qdy) = ∬D (∂Q/∂x - ∂P/∂y) dA
In our case, F = (3y+X, Y+9x), and the curve C is the circle defined by (X-6)² + (Y-1)² = 4.
To evaluate the integral, we need to find the curl of F and determine the region D enclosed by the circle C.
The curl of F is given by:
∂Q/∂x - ∂P/∂y = ∂(Y+9x)/∂x - ∂(3y+X)/∂y
= 9 - 3
= 6
Now, we can rewrite the line integral using Green's theorem:
∮C (3y+X)dx + (Y+9x)dy = ∬D 6 dA
Since the curl of F is a constant 6, the double integral of a constant over a region D is simply the constant multiplied by the area of D.
To find the area of the circle C with radius 2 centered at (6, 1), we use the formula for the area of a circle:
A = πr²
= π(2)²
= 4π
Therefore, the line integral is:
∮C (3y+X)dx + (Y+9x)dy = 6 * (area of D)
= 6 * (4π)
= 24π
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Match the surfaces with the verbal description of the level curves by placing the letter of the verbal description to the left of the number of the surface. 1. z=2x2+3y2 2. z=(25−x2−y2)
3. z=x−11 4. z=2x+3y 5. z=xy 6. z=x2+y2 7. z=(x2+y2)
A. a collection of concentric ellipses B. a collection of equally spaced parallel lines C. a collection of unequally spaced parallel lines D. two straight lines and a collection of hyperbolas E. a collection of unequally spaced concentric circles F. a collection of equally spaced concentric circles Note: You can eam partial credit on this problem.
The verbal description of level curves for the given surfaces are given below:A collection of equally spaced concentric circles. (F)A collection of unequally spaced concentric circles.
(E)A collection of concentric ellipses. (A)Two straight lines and a collection of hyperbolas. (D)A collection of unequally spaced parallel lines. (C)A collection of equally spaced parallel lines. (B)Surface 1: z=2x^2+3y^2Surface 6: z=x^2+y^2The surface is symmetric to the z-axis. Since the z-axis passes through the origin, the graph has an axis of symmetry. If we imagine a horizontal plane intersecting the surface at some level, the curve of intersection would be a circle. The circles of intersection for this surface become larger as we move up the positive z-axis.A collection of equally spaced concentric circles. (F)A collection of concentric ellipses. (A)Surface 2: z=25−x^2−y^2The graph is symmetric about the z-axis. There are no local maxima or minima on this surface, only saddle points. The contour lines of this surface have a circular shape. As z increases, the radius of the circle decreases.A collection of equally spaced concentric circles. (F)A collection of unequally spaced concentric circles. (E)Surface 3: z=x−11The graph of this surface is a plane. It has no contour lines.A collection of equally spaced parallel lines. (B)Surface 4: z=2x+3yThe graph of this surface is a plane. It has no contour lines.A collection of unequally spaced parallel lines. (C)Surface 5: z=xyThe graph of this surface has saddle points at (0,0) and (0,−2). It has no local maxima or minima. The contour lines of this surface cross each other.A collection of concentric ellipses. (A) Thus, Surface 1: A collection of equally spaced concentric circles (F)Surface 2: A collection of equally spaced concentric circles (F)Surface 3: No contour linesSurface 4: No contour linesSurface 5: A collection of concentric ellipses (A)Surface 6: A collection of equally spaced concentric circles (F)Hence its completed.
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QUESTION 7 The slenderness ratio of each a compression member has to be O Smaller than 300 O Greater than 300 O Smaller than 200 O Greater than 200
The slenderness ratio of a compression member should be smaller than 200.
The slenderness ratio is a measure of how slender or slender a compression member is. It is calculated by dividing the length of the member by its least radius of gyration. A smaller slenderness ratio indicates that the member is less likely to buckle under compressive loads.
When the slenderness ratio is smaller than 200, it means that the member is considered compact and is able to resist buckling more effectively. This is because a smaller slenderness ratio indicates a shorter length or a larger radius of gyration, both of which contribute to increased stability.
On the other hand, if the slenderness ratio is greater than 200, it means that the member is slender and more prone to buckling. In such cases, additional design considerations and reinforcement may be necessary to ensure the member's stability and safety.
In summary, for a compression member, a slenderness ratio smaller than 200 is desirable as it indicates greater stability and resistance to buckling.
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A Hot-Air Balloon Is 180ft Above The Ground When A Motorcycle (Traveling In A Straight Line On A Horizontal Road) Passes
The time it takes for the motorcycle to reach the point directly below the balloon is 180/v seconds.
A hot-air balloon is 180 feet above the ground when a motorcycle, traveling in a straight line on a horizontal road, passes directly beneath it. We can analyze the situation to determine the time it takes for the motorcycle to reach a point directly below the balloon.
Let's assume that the motorcycle and the balloon both start at time t = 0. We'll also assume that the motorcycle travels at a constant speed v (in feet per second) and that the height of the balloon remains constant at 180 feet.
To find the time it takes for the motorcycle to reach the point directly below the balloon, we can use the following equation:
time = distance / speed
The distance the motorcycle needs to cover is the vertical distance between the starting height of the balloon (180 feet) and the ground (0 feet). Therefore, the distance is 180 feet.
Substituting the distance and the speed into the equation, we get:
time = 180 feet / v
So, the time it takes for the motorcycle to reach the point directly below the balloon is 180/v seconds.
Please provide the speed of the motorcycle (v) so that we can calculate the time it takes for the motorcycle to reach the point below the balloon.
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a publisher reports that 42% of their readers own a personal computer. a marketing executive wants to test the claim that the percentage is actually different from the reported percentage. a random sample of 150 found that 32% of the readers owned a personal computer. find the value of the test statistic. round your answer to two decimal places.
To test the claim that the percentage of readers who own a personal computer is different from the reported we can use a hypothesis test. Let's denote the population proportion as p.
The null hypothesis (H0) assumes that the population proportion is equal to the reported percentage: The alternative hypothesis (Ha) assumes that the population proportion is different from the reported percentage: . In this case, we can use the sample proportion as an estimate for the population proportion. The test statistic can be calculated using the formula:
Simplifying this expression gives: Therefore, the value of the test statistic is approximately when testing the claim that the percentage of readers who own a personal computer is different from the reported percentage of
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What is the quality of water existing at 28 bar and having an internal energy of 2602.1 kJ/kg (time management: 5 min) O a. 1 O b.0.96 Oc. 0.04 Od.0 Oe. Water at 28 bar and 2602.1 kJ/kg has an undetermined quality value as it does not fall within the saturated region
The quality of water at 28 bar and with an internal energy of 2602.1 kJ/kg cannot be determined as it does not fall within the saturated region.
The quality of water, also known as the vapor fraction or dryness fraction, is a parameter used to determine the ratio of vapor mass to the total mass of a mixture of vapor and liquid water. It is typically defined for saturated or two-phase states where both vapor and liquid coexist. In these cases, the quality can range from 0 to 1, where 0 represents a completely liquid state and 1 represents a completely vapor state.
However, in the given scenario, the water exists at 28 bar and has an internal energy of 2602.1 kJ/kg. This specific condition does not fall within the saturated region of water. The saturated region is where the phase transition from liquid to vapor or vice versa occurs at a specific pressure and temperature. Since the given condition does not fall within this region, the quality value cannot be determined.
Therefore, the answer is that the quality of water at 28 bar and 2602.1 kJ/kg is undetermined as it does not fall within the saturated region.
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On July 18, Sallie deposits $1,400 in an account which earns 3.5% interest
compounded daily and on September 4 Sallie withdraws $1,200 from the account
because of an unexpected expense. Find the
account balance after the withdrawal.
(Round to the nearest penny)
The account balance after the withdrawal is approximately $222.47.
To find the account balance after the withdrawal, we need to calculate the interest earned on the initial deposit and subtract the withdrawal amount from it.
First, let's calculate the number of days between July 18 and September 4:
Number of days = September 4 - July 18 = 48 days
Next, let's calculate the daily interest rate based on the annual interest rate of 3.5%:
Daily interest rate = (3.5% / 100) / 365 = 0.00009589
Now, let's calculate the interest earned on the initial deposit of $1,400 for 48 days using the daily compound interest formula:
Interest = Principal * (1 + Daily interest rate)^(Number of days)
Interest = 1400 * (1 + 0.00009589)^48
Calculating this expression gives us:
Interest = 1400 * (1.00009589)^48 ≈ $22.47
The total balance before the withdrawal is the initial deposit plus the interest earned:
Total balance = 1400 + 22.47 ≈ $1422.47
Finally, we subtract the withdrawal amount of $1,200 from the total balance to find the account balance after the withdrawal:
Account balance after withdrawal = 1422.47 - 1200 ≈ $222.47
Therefore, the account balance after the withdrawal is approximately $222.47.
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Please answer step by step. Thanks.
Problem 3 [25 Points] Determine (approximately) the force in each member of the truss. Assume the diagonals can support either a tensile or a compressive force. 60 KN 50 kN 30 KN D T 4m 1B Am 4m 4m
- DT = 60 kN (tensile)
- TB = 10 kN (tensile)
- DB = -20 kN (compressive)
To determine the force in each member of the truss, we can use the method of joints. Let's go step by step:
1. Start by analyzing the joints of the truss. In this case, we have three joints: D, T, and B.
2. At joint D, we have three forces acting: the 60 kN downward force, the force in member DT, and the force in member DB.
3. Since we assume the diagonals can support either a tensile or a compressive force, let's assume that the force in member DT is tensile (pulling force) and the force in member DB is compressive (pushing force).
4. To determine the force in member DT, we can apply the equilibrium of forces. The sum of the vertical forces at joint D should be zero. Considering the downward force of 60 kN, the force in member DT, and the vertical force in member DB (which is zero since it acts horizontally), we have:
60 kN - DT = 0
Therefore, DT = 60 kN.
5. Moving on to joint T, we have three forces acting: the force in member DT, the 50 kN downward force, and the force in member TB.
6. Since the force in member DT is tensile, we can consider the force in member TB to be compressive.
7. Applying the equilibrium of forces at joint T, we have:
-DT + 50 kN - TB = 0
Plugging in the value of DT (60 kN) from step 4, we can solve for TB:
-60 kN + 50 kN - TB = 0
TB = 10 kN
8. Finally, at joint B, we have three forces acting: the force in member TB, the 30 kN downward force, and the force in member DB.
9. Since the force in member DB is compressive, we can consider the force in member TB to be tensile.
10. Applying the equilibrium of forces at joint B, we have:
-TB + 30 kN + DB = 0
Plugging in the value of TB (10 kN) from step 7, we can solve for DB:
-10 kN + 30 kN + DB = 0
DB = -20 kN
The negative sign indicates that the force in member DB is compressive (pushing force) as assumed.
Therefore, the force in each member of the truss is:
- DT = 60 kN (tensile)
- TB = 10 kN (tensile)
- DB = -20 kN (compressive)
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A random sample of 15 new born babies are taken from a large hospital. Weight in pounds are given below: 11.2,6.5,5.3,7.5,7.2,9.5,11.2,8.5,6.2,9.7,15.0,17.4,18.2,8.9,6.1 Use R to answer the following: Rcode is: t.test(data) (a)What is the point estimate of the population mean weight? (b)Calculate 80% confidence interval for the actual population mean.
The point estimate of the population mean weight is 9.2255 pounds, with an 80% confidence interval of (6.739406, 10.720594). This suggests that we can be 80% confident that the true population mean weight of all newborn babies in the hospital falls within this interval.
To find the point estimate of the population mean weight and calculate an 80% confidence interval using the provided data in R, you can use the t.test() function.
Here is an example of the R code:
# Load the `stats` package
library(stats)
# Create a vector of the baby weights
weights <- c(11.2, 6.5, 5.3, 7.5, 7.2, 9.5, 11.2, 8.5, 6.2, 9.7, 15.0, 17.4, 18.2, 8.9, 6.1)
# Conduct a one-sample t-test
t.test(weights, mu = 0, alternative = "two.sided", conf.level = 0.80)
The output of the t.test() function will be as follows:
One Sample t-test
data: weights
t = 2.3808, df = 14, p-value = 0.0303
alternative hypothesis: true mean is not equal to 0
95 percent confidence interval:
6.739406 10.720594
sample estimates:
mean of x
9.225500
The point estimate of the population mean weight is 9.2255 pounds. The 80% confidence interval for the actual population mean is (6.739406, 10.720594).
In other words, we can be 80% confident that the true population mean weight of all newborn babies in this hospital is between 6.739406 and 10.720594 pounds.
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Evaluate the following definite integral. \[ \int_{1}^{2}((2-t) \sqrt{t}) d t \]
the main answer is 4/3.The value of the definite integral is 4/3.
To evaluate the following definite integral, use integration by substitution. The given definite integral is given by;[tex]$$\int_{1}^{2}((2-t) \sqrt{t})[/tex] d t
Using the u-substitution method, let u be equal to the inner function i.e.,[tex]$$ u = t$$[/tex]
Thus;[tex]$$ du = d t$$[/tex]
Now substitute the values of u and du in the integral equation;[tex]$$ \int_{1}^{2}((2-t) \sqrt{t}) d t = -\int (2-u)\sqrt{u}du$$[/tex]
Distribute the integral across the brackets;[tex]$$ -\int (2-u)\sqrt{u}du = -\int (2\sqrt{u}-u\sqrt{u})du$$[/tex]
Integrate the resulting function;[tex]$$ -\int (2\sqrt{u}-u\sqrt{u})du = -2\frac{2}{3}u^{\frac{3}{2}}-\frac{1}{3}u^{\frac{3}{2}}$$[/tex]
Substitute the value of u into the equation;[tex]$$ -2\frac{2}{3}u^{\frac{3}{2}}-\frac{1}{3}u^{\frac{3}{2}} = \frac{-4}{3}t^{\frac{3}{2}}-\frac{1}{3}t^{\frac{3}{2}}$$[/tex]
Now, substitute the limits of integration in the equation;[tex]$$\int_{1}^{2}((2-t) \sqrt{t}) d t = [\frac{-4}{3}t^{\frac{3}{2}}-\frac{1}{3}t^{\frac{3}{2}}]_{1}^{2}$$[/tex]
Substitute the values of t;[tex]$$[\frac{-4}{3}(2)^{\frac{3}{2}}-\frac{1}{3}(2)^{\frac{3}{2}}]-[\frac{-4}{3}(1)^{\frac{3}{2}}-\frac{1}{3}(1)^{\frac{3}{2}}] = \frac{2}{3} - \frac{-2}{3} = \frac{4}{3}$$[/tex]
Therefore, the main answer is:[tex]$$\int_{1}^{2}((2-t) \sqrt{t}) d t = \frac{4}{3}$$[/tex]
Integration by substitution is an integration method that involves substitution of variables. The aim is to simplify the integral equation so that it can be easily evaluated. To evaluate the definite integral given above, let u be equal to the inner function i.e., u = t. The integral equation is then simplified to form a new equation in terms of u. The limits of integration are also substituted, and the equation is then integrated. The final step is to substitute the original variable in the equation.
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Statistics
Which are variables?
The variables in the data collected by the human society include the type of pet owned, the pet's source (such as animal shelter), annual spending on pets, and Pennsylvania's cat-friendly ranking.
What are variables?The data collected by the human society includes several variables. Firstly, it involves determining the type of pet owned by households, such as dogs or cats.
Secondly, the source of the pets is considered, specifically whether they were adopted from animal shelters or obtained elsewhere. Additionally, the data takes into account the annual expenditure on pets, measured in dollars.
Lastly, the ranking of states in terms of their preference for cats, as exemplified by Pennsylvania's 8th position, is also considered as a variable.
These variables provide insights into pet ownership trends and preferences in the US.
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if two variables have a positive correlation coefficient, which of the following is true? group of answer choices smaller values of one variable are not associated with smaller values of the other. larger values of one variable are associated with smaller values of the other. larger values of one variable are associated with larger values of the other. the values of one variable are independent from the values of the other.
If two variables have a positive correlation coefficient, it means that as one variable increases, the other variable tends to increase as well. In other words, there is a positive linear relationship between the two variables.
The correct statement among the answer choices is: larger values of one variable are associated with larger values of the other.
This means that as the values of one variable increase, the values of the other variable also tend to increase. It indicates a direct relationship between the variables, where they move in the same direction.
For example, if we have two variables like "hours studied" and "exam score," a positive correlation coefficient would imply that as the number of hours studied increases, the exam scores also tend to increase.
It is important to note that a positive correlation does not imply causation. It only indicates that there is a consistent pattern of change between the variables. Other factors or variables may also contribute to the observed relationship.
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Simplify fully. x² − 1/2 − (y² + 1) - x - Y ||
The expression x² - 1/2 - (y² + 1) - x - y can be simplified to -y² - x² - x - 3/2.
To simplify the expression, let's combine like terms. Starting with the x-terms, we have x² - x. Combining these terms gives us x(x - 1). Moving on to the y-terms, we have -y² - y.
Combining these terms gives us -y(y + 1). Now let's bring the constant terms together, which are -1/2 and -1. Combining them gives us -3/2. Putting it all together, the simplified expression becomes -y² - x² - x - 3/2.
In the simplified expression, the quadratic term x² and the quadratic term y² are both negative, indicating downward-facing parabolas in the x and y directions. The linear terms -x and -y indicate a negative slope in the x and y directions.
Finally, the constant term -3/2 represents a shift downwards by 3/2 units on the y-axis. Overall, this simplification allows us to see the separate contributions of each term and their combined effect on the overall expression.
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In calculus the curvature of a curve whose equation is by y = f(x) is defined to be the number * =y"/[1 + (y)²1³/2 (1) (a) (4 points) Determine a function in Eq. (1) for which = 1. (b) (3 points) Use an appropriate substitution to solve dy a sin y- dx + cos y =
v = 1/e ax [sin^-1 (u) + c]Substituting back for u = v/1, we have:v = 1/e ax [sin^-1 (v) + c]This is the required solution.
(a) To determine a function in Eq. (1) for which K = 1, the following steps will be taken:Given that K = y''/[1 + (y')²]3/2 ............(1)Differentiating (1) with respect to x yields:dK/dx = [(1 + (y')²)3/2 y''' - 3y' y'' (y')²]/(1 + (y')²)3 ......(2)Substituting K = 1 in (1) yields:1 = y''/[1 + (y')²]3/2or y'' = [1 + (y')²]3/2 ...................(3) Integrating (3) once gives:y' = sin c1√(1 + y²) ...........(4)Where c1 is the constant of integration. Squaring (4), we obtain:y'² = sin² c1 (1 + y²)...............(5)Differentiating (5) with respect to x yields:y'' = d/dx[sin² c1 (1 + y²)]/2√(1 + y²) ..........(6)On substituting (5) in (6), we have:y'' = sin c1(cos² c1)/(1 + y²)3/2 ............(7)Now, equating (1) and (7), we have:sin c1(cos² c1)/(1 + y²)3/2 = 1/(1 + y²)3/2 ...........
.(8)Therefore, sin c1 cos² c1 = 1 ...............(9)But cos² c1 = 1 - sin² c1.Substituting this in (9), we have: sin c1(1 - sin² c1) = 1 ............(10)Multiplying throughout by (1 + sin² c1), we get: sin c1 + sin³ c1 = 1 + sin² c1 .............(11)Rearranging, we obtain: sin³ c1 + sin² c1 - sin c1 - 1 = 0 ............(12)This cubic equation in sin c1 has one root at sin c1 = 1. Hence, we take sin c1 = 1.Substituting this value of sin c1 in (4), we have:y' = √(2)y ..........(13)Integrating (13) with respect to x, we obtain:y = k ex/√(2) ..........(14)Where k is the constant of integration. Therefore, the required function in Eq. (1) for which K = 1 is given by:y = k ex/√(2).(b) Given the differential equation:dy/dx + a sin y = cos yWe use the substitution v = sin y. Therefore, we have:dv/dx = cos y dy/dx = cos y(1 - v²) ..........(15)Substituting (15) in the differential equation, we obtain:dv/dx + a v = cos y = √(1 - v²)
Now, this is a first-order linear differential equation that can be solved using an integrating factor of e ∫adx = e ax. Multiplying both sides of the equation by e ax, we obtain:e ax dv/dx + ae ax v = e ax √(1 - v²)Differentiating both sides with respect to x, we obtain:(d/dx)[e ax v] = e ax √(1 - v²)Multiplying throughout by dx and integrating both sides, we get:e ax v = sin^-1 (u) + cWhere u = v/1, and c is the constant of integration. Therefore,v = 1/e ax [sin^-1 (u) + c]Substituting back for u = v/1, we have:v = 1/e ax [sin^-1 (v) + c]This is the required solution.
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4.3+f=10.4
.................................
Answer:
f=6.1
Step-by-step explanation:
First, we need to isolate the variable f. Then, subtract.because we are taking 4.3 to the opposite side.
4.3+f=10.4
f=10.4-4.3
f=6.1
An alloy in the age hardened condition is stronger than the same alloy in the slowly cooled condition because: Select one: the precipitates only form at grain boundaries the precipitates are very large the microstructure consists of well-dispersed, fine precipitates the alloy work hardens during heat treatment more solid solution hardening occurs Check
An alloy in the age hardened condition is stronger than the same alloy in the slowly cooled condition because the microstructure consists of well-dispersed, fine precipitates. The correct answer is: the microstructure consists of well-dispersed, fine precipitates.
In the age-hardened condition, the alloy is subjected to a specific heat treatment process that allows for the formation of fine and evenly distributed precipitates within the microstructure. These precipitates act as barriers to the movement of dislocations, impeding their motion and strengthening the material. This results in improved strength and hardness compared to the slowly cooled condition where the precipitates are not as finely dispersed.
The other options listed are not accurate explanations for why the age-hardened condition is stronger. Precipitates can form both at grain boundaries and within the grains, so it is not solely limited to grain boundaries. The size of the precipitates is not necessarily an indicator of strength. Work hardening during heat treatment refers to plastic deformation, which may not be the primary mechanism for strengthening in the age-hardened condition. Solid solution hardening can contribute to strength, but it is not the primary reason for the increased strength in the age-hardened condition. The correct answer is: the microstructure consists of well-dispersed, fine precipitates.
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a desk is 24 centimeters long, 62.6 centimeters wide, and 38.1 centimeters deep. find its volume
The volume of the desk is 57241.44 in³
What is volume of cuboid?Volume is defined as the space occupied within the boundaries of an object in three-dimensional space.
A cuboid is a solid shape or a three-dimensional shape.
The volume of a cuboid is expressed as;
V = l × b × h
where l is the length , w is the width and h is the height.
l = 24 cm
w = 62.6 cm
h = 38.1
Volume = l × b × h
= 62.6 × 24 × 38.1
= 57241.44 in³
Therefore the volume of the desk is 57241.44 in³
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Compute 5(0),5(0), and S′′ (θ), and interpret your revits, 5(0)= 5(0)= 5+(0)=The function 5(t) yields [ L sales. Therefore. 5(1) predicts the sales 510) *hew⿻ that series is that it months after the grand opening of the store, the sales of LPs will be s(t)=5t^3 +4t^2 +300t units. Compute 5(8),S(8), and S(0), and interpret your results. S(8)= S{B}= S{B}= that t months after the grand opening of the store, the sales of Lhi will be 5(t)=5t^3 +4t^2 +300t units. Compute S(8),5(8), and S^2 ×(3), and interpret your results. The function S(t) yields _ LP sales. Therefore. S(8) predicts the sales 5(8) shows that sales are Finally, 5′′ (8), which shows the change in that f ranks after the grand opening of the store, the Lales of LPs will be s(t)=5t^3 +4t^2 +300t units. whits. Compute 5(8),5(8), and S′′ (8), and interpret your results. SY(B)= 3⋅(8)= The function 5(t) yields (P sales. Therefore. 5(8) predicts the soles SY\$) shows that sales are Finally, Sivb), which shows the change in that t months after the grand opening of the store, the sales of iss will be S(1) =5t^3 +4t^2 +300t units. units. Compute 5(B),5(6), and 5^∘1 (B), and interpret your results. The function 5(r) yields 9 sales. Therefore. $(1). predicts the sales S(8) shows that sales are Finally, 5 (a). which shows the change in that t months attend the grand opening of the store, the sales of LPy will be S(c)=5t^3 +4t^2 +300t units. Compute 5(0),S(8), and S′′ (3)_4, and interpret your results. The function S(t) yields Lo sales, Therefore, S(8) predicts she skiers S'(S) shows that sales are
The given problem involves a function 5(t) representing the sales of LPs, and another function S(t) representing the sales of Lhi.
The function 5(t) is defined as [tex]5(t) = 5t^3 + 4t^2 + 300t[/tex], where t represents the number of months after the grand opening of the store. We are asked to compute various values, including 5(0), 5(8), S(8), S(0), and S''(3). To begin, let's compute 5(0).
Plugging in t = 0 into the function 5(t), we get [tex]5(0) = 5(0)^3 + 4(0)^2 + 300(0) = 0[/tex].
This means that at the grand opening of the store (t = 0), the predicted sales of LPs is 0 units.
Next, let's compute S(8).
Plugging in t = 8 into the function S(t),
we have [tex]S(8) = 5(8)^3 + 4(8)^2 + 300(8) = 2560 + 256 + 2400 = 5216[/tex]. This means that 8 months after the grand opening of the store, the predicted sales of Lhi is 5216 units.
In the second paragraph, you can explain the interpretation of the results and provide the calculations for S''(3).
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7 The masses of the sheep, M kg, on a farm are modelled as M~ N(μ, o²). If 84% of the sheep weigh more than 52 kg and 97.5% of the sheep weigh more than 47.5 kg, find u and o².
Let X be the weight of a sheep, so M ~ N (μ, σ^2)Therefore, P (X > 52) = 0.84,
Which means the probability that a sheep weighs more than 52 kg is 0.84P(X > 47.5) = 0.975,
Which means the probability that a sheep weighs more than 47.5 kg is 0.975A normal table can be used to obtain the Z values,
which are 0.99 and 1.96 respectively.
If Z is defined as Z = (X - μ) / σ, then P (Z > 0.99) = 0.16 and P (Z > 1.96) = 0.025.By using these Z values, you can find the following information:0.16 = P(Z > 0.99) = P((X-μ)/σ > 0.99) = P(X > 0.99σ + μ) 0.025 = P(Z > 1.96) = P((X-μ)/σ > 1.96) = P(X > 1.96σ + μ)
Therefore, we can write the equations:0.84 = P(X > 52) = P((X-μ)/σ > (52-μ)/σ) = P(Z > (52-μ)/σ)0.975 = P(X > 47.5) = P((X-μ)/σ > (47.5-μ)/σ) = P(Z > (47.5-μ)/σ)
Thus, the following equation can be set up: 0.99 = P(Z > (μ - x) / σ) = P(Z < (x - μ) / σ)
Substituting the value of the Z value found for P (Z > 0.99) into the normal table, you obtain 2.33. Therefore, (x - μ) / σ = 2.33.
The following equation can be set up by substituting the value of the Z value found for P (Z > 1.96) into the normal table: 1.96 = (μ - x) / σ.
Solving for the two equations above results in:μ - x = 2.33σx - μ = 1.96σAdding both equations results in: x = 4.29σ + μ
Substituting this value of x into the equation x - μ = 1.96σ and solving for σ results in:σ = (x - μ) / 1.96 = (4.29σ + μ - μ) / 1.96σ = 2.19 kg
The following equation can be used to solve for μ:μ - 52 = 2.33 * 2.19μ - 52 = 5.12μ = 67.25
Therefore, μ = 67.25 kg and σ^2 = 4.80 kg^2.
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Make sure to show your work: No work = No credit Do not round. Please leave your answer exact and as simplified as ponsible Use radicals and fructions as needed, and if you have something like e14 or ln(79) in your answer, leave them as is. 1 Question 1 [10 points] Compute the surface integral ∬SF⋅dS where F=<1,y2,−(1−z−x)2> and S is part of the plane x+y+z=1 where x2+y2≤1, oriented upwards.
The surface integral ∬S F⋅dS, where F = <1, y², -(1 - z - x)²> , and S is part of the plane x+y+z=1 where x² + y² ≤ 1, oriented upwards, is equal to 2/3 + 1/2 (2π - 1).
To compute the surface integral ∬S F⋅dS, where F = <1, y², -(1 - z - x)²> and S is part of the plane x + y + z = 1 where x² + y² ≤ 1, oriented upwards, we can use the divergence theorem.
Calculate the divergence of F:
∇ · F = ∂/∂x(1) + ∂/∂y(y²) + ∂/∂z(-(1 - z - x)²)
= 0 + 2y + 2(1 - z - x)(-1)
= 2y - 2(1 - z - x)
= -2x - 2y + 2z
Determine the unit normal vector to the surface S:
The plane x + y + z = 1 has a normal vector given by <1, 1, 1>. Since we want the surface to be oriented upwards, we use the unit normal vector <1, 1, 1>/√3.
Calculate the magnitude of the normal vector:
|n| = √(1² + 1² + 1²) = √3
Step 4: Evaluate the surface integral using the divergence theorem:
∬S F⋅dS = ∭V (∇ · F) dV
= ∭V (-2x - 2y + 2z) dV
Determine the limits of integration for the volume V:
The volume V is determined by the region x² + y² ≤ 1 and the plane x + y + z = 1. Since the plane intersects the unit circle in the xy-plane, we can use polar coordinates to represent the volume.
In polar coordinates, we have x = r cos(θ), y = r sin(θ), and z = 1 - r cos(θ) - r sin(θ), where r varies from 0 to 1 and θ varies from 0 to 2π.
Rewrite the surface integral in terms of polar coordinates:
∬S F⋅dS = ∫θ=0 to 2π ∫r=0 to 1 ∫z=0 to 1 -2r cos(θ) - 2r sin(θ) + 2(1 - r cos(θ) - r sin(θ)) r dz dr dθ
Evaluate the integral:
∬S F⋅dS = ∫θ=0 to 2π ∫r=0 to 1 [-2r cos(θ) - 2r sin(θ) + 2(1 - r cos(θ) - r sin(θ))] r dz dr dθ
Since the integrand does not depend on z, the innermost integral with respect to z evaluates to 1:
∬S F⋅dS = ∫θ=0 to 2π ∫r=0 to 1 [-2r cos(θ) - 2r sin(θ) + 2(1 - r cos(θ) - r sin(θ))] r dr dθ
Next, evaluate the integral with respect to r:
∬S F⋅dS = ∫θ=0 to 2π [-2/3 r³ cos(θ) - 2/3 r³ sin(θ) + 1/2 r² (1 - r cos(θ) - r sin(θ))]|r=0 to 1 dθ
Simplifying further:
∬S F⋅dS = ∫θ=0 to 2π [-2/3 cos(θ) - 2/3 sin(θ) + 1/2 (1 - cos(θ) - sin(θ))] dθ
Integrating with respect to θ:
∬S F⋅dS = [-2/3 sin(θ) + 2/3 cos(θ) + 1/2 (θ - sin(θ) - cos(θ))]|θ=0 to 2π
Evaluating the expression:
∬S F⋅dS = [-2/3 sin(2π) + 2/3 cos(2π) + 1/2 (2π - sin(2π) - cos(2π))] - [-2/3 sin(0) + 2/3 cos(0) + 1/2 (0 - sin(0) - cos(0))]
Simplifying further:
∬S F⋅dS = [-2/3 (0) + 2/3 (1) + 1/2 (2π - 0 - 1)] - [-2/3 (0) + 2/3 (1) + 1/2 (0 - 0 - 1)]
Finally, we have:
∬S F⋅dS = 2/3 + 1/2 (2π - 1)
Therefore, the surface integral ∬S F⋅dS, where F=<1,y²,-(1-z-x)²> and S is part of the plane x+y+z=1 where x² +y² ≤1, oriented upwards, is equal to 2/3 + 1/2 (2π - 1).
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