Marsha deposited $7,000 into a savings account 4 years ago. The simple interest rate is 2%. How much money did Marsha eam in interest?
Answer:
$560
Step-by-step explanation:
The formula for simple interest is:
I = Prt, where P is the principal, r is the interest rate, and t is the time (in years).
Plugging in the values, we get:
I = $7,000 * 2% * 4 years = $560
So, Marsha earned $560 in interest.
There are 20 packs of cookies with 10 in each. If these are shared equally among 8 children. How each child get?
Answer: 25 per child
Step-by-step explanation:
20 x 10 = 200
200/8 = 25
100 POINTS BRAINLIEST A business buys equipment with $300 cash and puts $425 on credit. What is the value of this asset?
A. $725
C. $425
B. $300
D. $125
Answer: A) $725
Step-by-step explanation:
The value of the asset that the business bought with $300 cash and $425 on credit is $725. The total amount that the business spent on the equipment is equal to the sum of the cash and the credit, which is $300 + $425 = $725.
Hey what is 10(4/24 - 9) - 7.45
Answer
[tex] - 95.783[/tex]
Which inequality's solution is graphed here?
x
A
B
X+2≤0
D
X-2≤0
CX-220
x+220
-10-9-8-7-6-5-4-3
E x = 0
-2 -1 0
1 2 3
4
5
6 7 8 9 10
The complete question:
Which inequality's solution is graphed here?
A) x + 8 < 5
B) x - 5 < 8
C) x + 5 < 8
D) x - 8 < 5
The given graph represents on the number line is represented by inequality x - 5 < 8. So option B is correct.
What is a number line?Real numbers are represented by a straight line known as a number line. The distance between the dots on the line, which correlates to the magnitude of the numbers, is how the numbers are typically represented. Positive or negative numerals can be used, and they are normally marked at regular intervals.
Given that,
A graph,
which has values less than 13,
In form of inequality it can be written as,
x < 13
And inequality x - 5 < 8,
can be written as x < 13
Hence, the option b is correct inequality.
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Use the information provided to answer Part A through Part D.
One method that can be used to prove that the diagonals of a parallelogram bisect
each other is shown in the given partial proof.
S
ven: Quadrilateral PQRS is a parallelogram
ove:
PT= RT
ST= QT
1.
2.
7.
3.
4.
Statements
Quadrilateral PQRS is a
parallelogram
PQ || SR
PS || QR
ZPQS = ZRSQ
ZQPR ZSRP
?
5. ASRT AQPT
6.
PT=RT
ST=QT
Q
I
R
PT = RT
ST=QT
1. Given
2. Definition of
parallelogram
3.
4.
5.
Reasons
6.
2
?
Opposite sides of a
parallelogram are
congruent
?
Corresponding par
of congruent
triangles are
congruent
7. Definition of
congruent line
erop segments
Answer:
the anwser is 5
Step-by-step explanation: 5
Given the function: calculate the following values.
The values of f(-1) , f(0) and f(2) are 0, 8 , 16 .
What is a function ?
Function can be defined in which it relates an input to output.
Given function ,
f ( x ) = 4x + 4 when x < 0
= 4x + 8 when x >= 0
f(-1) = 4x + 4
= 4 ( -1 ) + 4
= 0
f(0) = 4x + 8
= 4*0 + 8
= 8
f(2) = 4x + 8
= 4*2 + 8
= 8 + 8
= 16
Therefore, The value of f(-1) , f(0) and f(2) are 0, 8 , 16 .
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What is the value of x? enter your answer in the box. X = cm a bow tie shape polygon made of two bow ties that share a vertex. The shape is created by two segments intersecting forming two triangles with vertical angles. An alternate interior angle of the triangles are marked congruent to each other. The larger triangle is on the left and the smaller triangle is on the right. In the larger triangle, the left side of the triangle is 32 centimeters. The south side of the triangle is 40 centimeters. On the smaller triangle, the right side of the triangle is 4 centimeters. The north side of the triangle is labeled x.
By proving the two triangles as similar triangles , the value of x in the triangles is x = 5 cm .
By using the proportions, for the two triangles which are similar because they contain three equal angles ;
The One angle due to connected by the vertex (oppose by the vertex), another angle as marked with the tick, and
the third angle one has to be same because of the sum of the three internal angles of a triangle must equal 180 degrees.
So , the proportions of the sides are written as :
⇒ 4/32 = x/40 ;
Cross multiplying , and solving for "x" ,
we get ;
⇒ x = (4 × 40)/32 ;
⇒ x = 5 .
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The given question is incomplete , the complete question is
What is the value of x in the polygon given below ?
What is the quotient and remainder, written as partial fractions, of
15x²+52x +43
3x²+5x-8
The quotient and remainder, written as partial fractions, of 15x²+52x+43/3x²+5x-8 would be A/(3x + 8) + B/(x - 1) where A is -8/3 and B is 1.
What in mathematics is a partial fraction?
The fractions that are utilized to break down a rational expression are called partial fractions.
Any component of an algebraic expression that is divided into a sum of two or more rational expressions is referred to as a partial fraction.
15x²+ 52x + 43/3x²+5x-8
15x²+52x +43/3x² + ( 8 -3)x - 8
15x²+52x +43/3x² + 8x -3x - 8
15x²+52x +43/3x(x - 1) +8(x - 1 )
15x²+52x +43/(3x + 8)(x -1 )
A/(3x + 8) + B/(x - 1)
To find the value of A;
3x + 8 = 0
x = -8/3
To find the value of B;
x - 1 = 0
x = 1
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The
ages
of 5 women are
48, y, 52, 50 and (2y-5).
If their average is
47 years,
Find the age of the oldest woman
Given the information that the average of the ages of 5 women is 47 years and that their ages are 48, y, 52, 50, and (2y-5), we can set up the following equation:
(48 + y + 52 + 50 + 2y - 5) / 5 = 47
Expanding the equation and simplifying, we get:
5y = 244
y = 48.8
So the age of the woman whose age is represented by the variable y is 48.8 years.
The oldest woman is represented by the age of 52 years, which is the largest of all the ages.
Therefore, the age of the oldest woman is 52 years.
In the diagram below, AD EB, m/ABD = 115° and m/D = 27°.
Find m < ABE
The value of angle ABE is 52°
What are interior angle of a triangle ?A triangle is a polygon with three edges and three vertices. It is one of the basic shapes in geometry. A triangle with vertices A, B, and C is denoted by triangle ABC.
The interior angles of a triangle are the inside angles formed where two sides of the triangle meet.
The sum of interior angle in a triangle is 180°
Angle EBD = 180-(90+27)
= 180-117
= 63°
angle ABE + EBD = ABD
ABE = ABD - EBD
ABE = 115-63
= 52°
Therefore the value of angle ABE is 52°
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This is a number sequence
2,3,5,9,17,33,65
what are the next two terms?
The next two terms of the number sequence 2,3,5,9,17,33,65 are given as follows:
129, 257.
How to obtain the next two terms of the number sequence?This is a recursive number sequence, as each term is obtained multiplying the previous term by 2 and then subtracting one.
Then the term after 65 is given as follows:
65 x 2 - 1 = 130 - 1 = 129.
The term after 129 is given as follows:
2 x 129 - 1 = 257.
Then the next two terms are 129 and 257.
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Find dy/dx by implicit different iation xy^2= 4.
The value of after differentiation dy/dx will be ( 4 - y² ) / ( 2xy ).
What is differentiation by parts?By using the concept of differentiation by parts the differential will be done in two parts. In the first part, it is done with respect to y and in the second part the differentiation is done for x.
Given function is xy²= 4. The given expression will be different as below,
dy / dx ( xy² ) - 4 = 0
2xy( dy / dx) + y² = 0
dy / dx = -y / 2x
Therefore, the value of dy/dx upon differentiation will be (4 - y2) / ( 2xy ).
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Mrs. Hamada has 15 paintbrushes and wants to put the same number into each of 5 water cups. Complete the equation below to show how many paintbrushes will be in each cup.
Answer:
3 paintbrushes
Step-by-step explanation:
15 divided by 5 is 3.
So, Mrs. Hamada will put 3 paintbrushes in each cup.
The function f (x) = 125,000 (1.028)x models the change in population of Pool City, where x represents the number of years since 2010. Which statement is NOT true?
A.) The domain of the function includes all real values of x .
B.) The point (1, 128500) represents the population of Pool City in 2011.
C.) The population of Pool City in 2010 is 125,000.
D.) The function has an asymptote at y = 125,000 .
13 Show that the equation (p+1)x² + (2p+3)x+ (p+2)=0 has real roots for all real values of p.
The equation (p+1)x² + (2p+3)x+ (p+2)=0 has real roots for all real values of p at x = -1, -2
What is a polynomial?A polynomial equation is a mathematical equation in which the polynomial is set to zero. The equation is made up of variables, non-negative integer exponents, coefficients, arithmetic operations, and an equal sign.
Given that:
(p+1)x² + (2p+3)x + (p+2) = 0
Open brackets;
px² + x² + 2px + 3x + p + 2 = 0
Move all terms not containing p to the right side of the equation.
px² + 2px + p = −x² − 3x − 2
Factor p out of px² + 2px + p.
p(x² + 2x + 1) = −x² − 3x − 2
Factor using the perfect square rule.
p(x+1)² = −x² − 3x − 2
Divide each term in p( x + 1 )² = −x² − 3x − 2 by (x + 1)² and simplify.
[tex]p= - \dfrac{x^2}{(x+1)^2}-\dfrac{3x}{(x+1)^2}-\dfrac{2}{(x+1)^2}[/tex]
Set [tex]p= - \dfrac{x^2}{(x+1)^2}-\dfrac{3x}{(x+1)^2}-\dfrac{2}{(x+1)^2}[/tex] to be equal to zero;
[tex]- \dfrac{x^2}{(x+1)^2}-\dfrac{3x}{(x+1)^2}-\dfrac{2}{(x+1)^2}=0[/tex]
Solve for x;
-x² - 3x - 2 = 0
Factor the left side of the equation.
-(x + 1) (x + 2) = 0
x = -1
x = -2
The final solution is all the values that make -(x + 1) (x + 2) = 0 true
x = -1, - 2
Exclude the solutions that do not make [tex]- \dfrac{x^2}{(x+1)^2}-\dfrac{3x}{(x+1)^2}-\dfrac{2}{(x+1)^2}=0[/tex] true.
Therefore, x = -2
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prove that sin51 + sin81 - cos21 = 0
Answer:
Step-by-step explanation:
To prove that sin(51) + sin(81) - cos(21) = 0, we can use the trigonometric identity:
sin(A + B) = sin(A)cos(B) + cos(A)sin(B)
We can rewrite 51 and 81 as the sum of two angles:
51 = 45 + 6
81 = 90 - 9
Using the above identity, we can write:
sin(51) = sin(45 + 6) = sin(45)cos(6) + cos(45)sin(6) = (2/2)sin(6) + (2/2)cos(6) = sin(6) + cos(6)
and
sin(81) = sin(90 - 9) = sin(90)cos(9) - cos(90)sin(9) = 0 + (-1)sin(9) = -sin(9)
Finally,
sin(51) + sin(81) - cos(21) = sin(6) + cos(6) - sin(9) - cos(21) = (sin(6) + cos(6)) - (sin(9) + cos(21))
We know that sin(90 - x) = cos(x) and cos(90 - x) = sin(x), so we can rewrite the right-hand side as:
(sin(6) + cos(6)) - (cos(90 - 9) + sin(90 - 21)) = (sin(6) + cos(6)) - (cos(9) + sin(69))
We also know that sin(180 - x) = -sin(x) and cos(180 - x) = -cos(x), so we can rewrite the right-hand side as:
(sin(6) + cos(6)) - (cos(9) + -sin(111)) = (sin(6) + cos(6)) - (-sin(111) + cos(9))
Since sin(6) + cos(6) = sin(6 + 90) = sin(96) and -sin(111) + cos(9) = sin(69 - 180) = -sin(111), we can simplify the expression further to:
sin(6) + cos(6) - (-sin(111)) + cos(9) = sin(96) + cos(9)
Since sin(x + y) = sin(x)cos(y) + cos(x)sin(y), we can write:
sin(96) + cos(9) = sin(60)cos(36) + cos(60)sin(36) = (2/2)sin(36) + (√3/2)cos(36) = sin(36) + (√3/2)cos(36)
Finally, since sin(2x) = 2sin(x)cos(x), we can write:
sin(36) + (√3/2)cos(36) = 2sin(18)cos(18) + (√3/2)cos(36) = 2(√2/2)(√2/2) + (√3/2)(√2/2) = (√2 + √6)/2 + (√6/2) = (√2 + √6)
So, sin(51) + sin(81) - cos(21) = (√2 + √6) ≠ 0.
Therefore, we have shown that sin(51) + sin(81) - cos(21) ≠ 0, and the statement "sin(51) + sin(81) - cos(21) = 0" is false.
(Q) John has 25 red marbles, 15 blue marbles and 10 yellow marbles. He wants to make similar groups using all the marbles.
(a) Work out the highest number of groups he can make.
(b) Also work out how many, of each color marble, will be in each group.
Answer:
(a) highest number of groups = 5
(b) out how many, of each color marble, will be in each group.
5 red
3 blue
2 yellow
Step-by-step explanation:
The GCF of 25, 15, 10 gives you the greatest number of groups you can form with those numbers
GCF of 25, 15 and 10 can be found as follows by finding factors of each number:
25 = 5 x5
15 = 5 x 3
10 = 5 x 2
Choose the highest number that is common in each group and this is 5
So John can make a maximum number of 5 groups
Divide each number by the GCF to find how may in each group
25/ 5 = 5 red marbles
15/5 = 3 blue marbles
10/5 = 2 yellow marbles
So there are 5 groups max possible each group containing 5 red, 3 blue and 2 yellow marbles
If the radius of one of the semicircles is 7 meters, what is the circumference of one of the semicircle? asap 70 Ponits!!!!!!!!!!
10.99 m
21.98 m
87.92 m
43.96 m
Answer:
The circumference of one of the semicircles with a radius of 7 meters would be approximately 21.98 meters.
Step-by-step explanation:
The circumference of a circle can be calculated using the formula:
C = 2πr
where C is the circumference, π (pi) is approximately equal to 3.14, and r is the radius of the circle.
For a semicircle with a radius of 7 meters, the circumference can be calculated as follows: Because the semicircle is a half circle, then:
C = (2πr)/2= 3.14 × 7 = 21.98 meters
So, the circumference of one of the semicircles with a radius of 7 meters would be approximately 21.98 meters.
Answer:
The circumference of one of the semicircles is 21.98 m.
Step-by-step explanation:
The formula for the circumference of a circle is C = 2πr, where r is the radius of the circle.
A semicircle is half a circle, therefore the length of the curved part of the circumference of a semicircle is half the circumference of a circle: πr.
Given the radius of one of the semicircles is 7 m and π ≈ 3.14, the circumference of the semicircle is:
⇒ C = 3.14 · 7
⇒ C = 21.98 m
Based on previous sales, Ron predicted sales of 80 pen sets. He actually sold 100 pen sets. Find the error and absolute error for the pen sets. A 5-column table with 3 rows. Column 1 is labeled Item with entries folders, erasers, pen sets. Column 2 is labeled Approximate Value with entries 25, 220, 80. Column 3 is labeled Exact value with entries 30, 200, 100. Column 4 is labeled Error with entries negative 5, 20, a. Column 5 is labeled Absolute Error with entries 5, 20, b.
The error is 20 and absolute error for the pen sets is also 20. Absolute error is the difference between a quantity's observed or inferred value and its actual value.
What is a absolute error statement?Absolute error is the difference between such a quantity's observed or assumed value and its real value. Because it doesn't indicate the error's magnitude, the absolute inaccuracy is insufficient.
What are absolute and relative error?The difference between a quantity's measured value and its actual value is known as absolute error. The difference between the measurement's absolute error and the quantity's actual value is referred to as relative error.
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Answer:
15%
Step-by-step explanation:
flip edge
How to I arrive at this number using a common factor?
The common factor is 6[tex]e^{6x}[/tex] (2x - 5)⁸.
What is a common factor?
These are the "common factors" when we determine the factors of two or more numbers and discover some of those factors are the same (or "common").
Given that
d/dx[[tex]e^{6x}[/tex](2x - 5)⁹]
The formula of the product rule is d/dx(uv) = uv' + vu'.
=(2x - 5)⁹d/dx([tex]e^{6x}[/tex]) + [tex]e^{6x}[/tex]d/dx(2x - 5)⁹
Now applying the formula d/dx(x^n) = nx^(n-1), d/dx e^(mx) = m e^(mx)
=(2x - 5)⁹ 6[tex]e^{6x}[/tex] + [tex]e^{6x}[/tex]×2×9 × (2x - 5)⁸
= 6[tex]e^{6x}[/tex] (2x - 5)⁹ + 18[tex]e^{6x}[/tex](2x - 5)⁸
Now taking common 6[tex]e^{6x}[/tex] (2x - 5)⁸
= 6[tex]e^{6x}[/tex] (2x - 5)⁸ [(2x - 5) + 3]
= 6[tex]e^{6x}[/tex] (2x - 5)⁸ [2x - 5 + 3]
= 6[tex]e^{6x}[/tex] (2x - 5)⁸(2x - 2)
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Rounded to 3 decimal places, what is the value of r for this data set?
The correlation coefficient r of the data given is 0.938
What is the correlation coefficient?The correlation coefficient is a statistical measure of the strength of a linear relationship between two variables.
Given that a set of data showing the values of variables x and y, we are asked to find the correlation coefficient r of the data given,
We know that,
The correlation coefficient r is a number between and calculated to represent the linear dependence of two variables or sets of data.
Using an Excel tool :- (CORREL function) = CORREL(B3:B10,C3:C10)
We get, r = 0.938
Hence, the correlation coefficient r of the data given is 0.938
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Determine the truth value of the following statements if the universe of discourse of each variable is the set of real numbers. Enter your answer as Tor F.
1.∃x∀y(xy = 0)
2. ∃x (x^2 = -1)
The truth value for the logical proposition is 1) T 2) F 3) T 4) F 5) T
The rules of mathematical logic specify methods of reasoning mathematical statements. Greek philosopher, Aristotle, was the pioneer of logical reasoning. Logical reasoning provides the theoretical base for many areas of mathematics and consequently computer science. It has many practical applications in computer science like the design of computing machines, artificial intelligence, the definition of data structures for programming languages etc.
Propositional Logic is concerned with statements to which the truth values, “true” and “false”, can be assigned. The purpose is to analyze these statements either individually or in a composite manner
the truth value of the following statements if the universe of discourse of each variable is the set of real numbers. Enter your answer as T or F.
1) there exists x for all y xy=0 is true T
2) there exist x x2=-1 F
3) for all x2=y T
4) for all x there exist x=y2 F
5) for all x not equal to zero xy=1 T
The complete question is -
the truth value of the following statements if the universe of discourse of each variable is the set of real numbers. Enter your answer as T or F.
1) there exists x for all y xy=0 is true
2) there exist x x2=-1
3) for all x2=y
4) for all x there exist x=y2
5) for all x not equal to zero xy=1
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A bag contains 8 green marbles and 32 blue marbles. If a representative sample con
Because the ratio of green marbles to blue males is 1:4 in the population, the e
be 8 blue marbles.
Answer:
The expected number of blue marbles in a sample of 8 marbles would be 4 times the number of green marbles, so 4 * 8 = 32. Thus, the expected number of blue marbles in a sample of 8 marbles is 32.
Step-by-step explanation:
SOMEONE PLEASE HELP ASAP!!!! Solve the triangle round to the nearest tenth.
Answer:
s = 13.6
m∠T = 35.7°
m∠U = 61.3°
Step-by-step explanation:
• Solving for side s:
To find the length of side s, we have to use the cosine rule:
[tex]\boxed{a^2 = b^2 + c^2 - 2bc \ cosA}[/tex],
where:
a = unknown sideb, c = adjacent sidesA = angle opposite to the unknown side.In this case, the unknown side is s, and the sides adjacent to it have lengths of 8 and 2. The angle opposite to s is ∠S = 83°. Therefore,
[tex]s^2 = 8^2 + 12^2 -2(8)(12) \cdot cos(83^{\circ})[/tex]
⇒ [tex]s = \sqrt{8^2 + 12^2 -2(8)(12)\cdot cos(83^{\circ})}[/tex]
⇒ [tex]s = \bf 13.6[/tex]
• Solving for m∠T:
In order to find m∠T, we can use the sine rule:
[tex]\boxed{\frac{sinA}{a}= \frac{sinB}{b} =\frac{sinC}{c}}[/tex],
which means that the ratios of the sines of angles and their opposite sides are equal for a triangle.
The side opposite to ∠T is US = 8. Therefore:
[tex]{\frac{sinT}{8} = \frac{sin(83^{\circ})}{13.6}}[/tex]
⇒ [tex]sinT= \frac{sin(83^{\circ})}{13.6} \times 8[/tex]
⇒ [tex]T = sin^{-1}( \frac{sin(83^{\circ})}{13.6} \times 8)[/tex]
⇒ [tex]T = \bf 35.7^{\circ}[/tex]
• Solving for m∠U:
Now that we know the values of two angles of the triangle, we can calculate the third angle using the fact that the angles in a triangle add up to 180°:
∠U + ∠S ∠T = 180°
⇒ ∠U + 83° + 35.7° = 180°
⇒ ∠U = 180° - 83° - 35.7°
⇒ ∠U = 61.3°
O Points: 0 of 1
Sav
Write the following phrase as an algebraic expression and simplify if possible. Let x represent the unknown number.
Two times the sum of a number and five
The required simplified expression for "Two times the sum of a number and five" is 2x + 10.
What is an algebraic expression?An algebraic expression is defined as when the expression is formed with help of variables such as x, y z, and so on. in the format of x + y + z or in any mathematical operation.
Here,
The phrase "Two times the sum of a number and five" can be written as
= 2(x + 5)
This is an algebraic expression that represents the value of two times the sum of the unknown number (represented by "x") and five.
We can simplify this expression by distributing the 2
= 2(x + 5) = 2x + 10
Therefore, the simplified expression for "Two times the sum of a number and five" is 2x + 10.
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plsss help i really need it
A unit can be used for measurement, and is commonly found in mathematics to describe length, size, etc.
First, we need to know the conversion rate between the two units (pounds lb and kilograms kg)
1 pound = 0.45359237 kilogramsNow, we can convert 90 pounds.
90 × 0.45359237 = 40.8233133 kgSo, 90lb ≈ 41kg
(If you were to round)
20% discount on $365 purchase
Answer:
To find the amount of the discount, we need to multiply the purchase price by 20% or 0.20.
Discount = $365 × 0.20 = $73
So, the discount on a $365 purchase is $73.
The price after the discount would be $365 - $73 = $292.
To calculate the discount on a $365 purchase with a 20% discount, you can follow these steps:
1. Calculate the discount amount:
Discount = 20% x $365 = $73
2. Subtract the discount from the original price:
Final price = $365 - $73 = $292
Therefore, the final price of the $365 purchase with a 20% discount is $292.
convert the following measurement
The value of expression after change its measurement as;
⇒ 3.4 × 10⁻⁴ kg . m²/ s²
What is Measurement unit?A measurement unit is a standard quality used to express a physical quantity. Also it refers to the comparison between the unknown quantity with the known quantity.
Given that;
The expression is,
⇒ 3.4 × 10⁵ g . cm² / s²
Now, We know that;
⇒ 1 cm = 1/1000 m
⇒ 1 cm = 1/10³ m
⇒ 1 g = 1/1000 kg
⇒ 1 g = 1/10³ kg
Hence, We get;
⇒ 3.4 × 10⁵ g . cm² / s²
⇒ 3.4 × 10⁵ (1/10³) kg . (1/10³)² m²/ s²
⇒ 3.4 × 10⁵ × 10⁻³ × 10⁻⁶ kg . m²/ s²
⇒ 3.4 × 10⁻⁴ kg . m²/ s²
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Assuming that b is positive, solve the following equation for b.
b
S
- 1
b≈
(2x-6)dx=13 Round your final answer to 4 decimal places.
(Give the positive answer only.)
The value of b is given as follows:
b = 8.4.
How to obtain the value of b?The value of b is obtained solving the definite integral in this problem.
The integral of the function 2x - 6 is given as follows:
x² - 6x.
At x = b, the numeric value of the integral is given as follows:
b² - 6b.
At x = -1, the numeric value of the integral is given as follows:
(-1)² - 6(-1) = 1 + 6 = 7.
Applying the Fundamental Theorem of Calculus, the equation to obtain the value of b is given as follows:
b² - 6b - 7 = 13.
b² - 6b - 20 = 0.
Which is a quadratic function with the coefficients given as follows:
a = 1, b = -6 and c = -20.
The discriminant is given as follows:
D = b² - 4ac
D = (-6)² - 4(1)(-20)
D = 116.
Hence the positive solution is given as follows:
b = (-b + sqrt(D))/2a
b = (6 + sqrt(116))/2
b = 8.4.
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