Given the system of linear equations:
fx+6y=6
(y=x-2
Part A: Graph the system of linear equations.
Part B: Use the graph created in Part A to determine the solution to the system.
Part C: Algebraically verify the solution from a Part B
Answers
Taking into account the definition of a system of linear equations, graphically and analytically it can be seen that the solution is (2.571, 0.571).
System of linear equationsA system of linear equations is a set of two or more equations of the first degree, in which two or more unknowns are related.
Solving a system of equations consists of finding the value of each unknown so that all the equations of the system are satisfied. That is, with which when replacing, they must give the solution proposed in both equations.
This caseIn this case, the system of equations to be solved is
x+6y=6
y=x-2
There are several methods to solve a system of equations, it is decided to solve it using the graphical method, which consists of representing the equations of the system to deduce its solution. The solution of the system is the point of intersection between the graphs, since they satisfy both equations.
The graph of the system of equations in this case is attached, where it can be seen that the intersection point, and therefore the solution, is (2.571, 0.571)
Algebraically, it is used the substitution method, which consists of clearing one of the two variables in one of the equations of the system and substituting its value in the other equation.
In this case, substituting the second equation in the first one you get:
x+6(x-2)=6
Solving:
x +6x -12=6
7x= 6+12
7x=18
x=18÷7
x= 2.571
Replacing in y=x-2, you get:
y= 2.571 - 2
y= 0.571
Finally, graphically and analytically it can be seen that the solution is (2.571, 0.571).
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Related Questions
a. Find the linear approximation for the following function at the given point.
b. Use part (a) to estimate the given function value.
f(x,y)= -4x^2 +y^2 ; (2,-2); estimate f(2.1, -2.02)
a. L(x,y) = ______
b. L(2.1, -2.02) = _________ (Type an integer or a decimal.)
Answers
a. to find the linear approximation for the given function f(x, y) = -4x² + y²; (2, -2) is given by L(x, y)
= f(2, -2) + fx(2, -2)(x - 2) + fy(2, -2)(y + 2). The linear approximation equation is denoted by L(x, y) which is the tangent plane to the surface of the function f(x, y) at (2, -2).L(x, y)
= f(2, -2) + fx(2, -2)(x - 2) + fy(2, -2)(y + 2)
= [-4(2)² + (-2)²] + [-16x] (x - 2) + [4y] (y + 2)
=-16(x - 2) + 8(y + 2) - 12The equation of the tangent plane is L(x, y)
= -16(x - 2) + 8(y + 2) - 12b.
to estimate the given function value using the linear approximation from part a is L(2.1, -2.02) = -16(2.1 - 2) + 8(-2.02 + 2) - 12.L(2.1, -2.02)
= -0.16.The estimate of the given function value is -0.16. Hence, the correct option is (a) L(x,y)
= [-4(2)² + (-2)²] + [-16x] (x - 2) + [4y] (y + 2)
= -16(x - 2) + 8(y + 2) - 12; (b) L(2.1, -2.02)
= -16(2.1 - 2) + 8(-2.02 + 2) - 12
= -0.16.
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Maris purchased a building for £10 m on 1 January 2020 and rented it out to an unassociated company. At 31 December 2020 it is estimated that the building could be sold for £10.8 m, with selling costs of £200,000. If Maris uses the fair value model, which of these statements concerning the fair value exercise for the year ended 31 December 2020 is true?
a. Gain of £600,000 to Statement of Profit or loss
b. Gain of £600,000 to Revaluation surplus and OCl
c. Gain of £800,000 to Statement of Profit or loss
d. Gain of £800,000 to Revaluation surplus and OCl
Answers
The correct answer is: c. Gain of £800,000 to Statement of Profit or loss.
Since Maris uses the fair value model, the gain from the increase in the fair value of the building is recognized in the Statement of Profit or Loss. In this case, the building's fair value increased from £10 million to £10.8 million, resulting in a gain of £800,000. Therefore, the gain of £800,000 should be recognized in the Statement of Profit or Loss.According to the fair value model, any gain or loss resulting from the change in fair value of the asset should be recognized in the financial statements. In this case, the increase in the fair value of the building is considered a gain.
Since the gain of £800,000 (the difference between the fair value of £10.8 million and the original purchase price of £10 million) is a result of the change in the asset's fair value, it should be recognized in the Statement of Profit or Loss. This gain represents the increase in the value of the building during the year.
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Find dy/dy for
e^cos y = x^6 arctan y
NOTE: Differentiate both sides of the equation with respect to
x, and then solve for dy/dx
Do not substitute for y after solving for dy/dx
Answers
Therefore, the expression for dy/dx is [tex](6x^5 * arctan(y)) / (-sin(y) * e^cos(y) - x^6 * (1/(1+y^2))).[/tex]
To find dy/dx for the equation[tex]e^cos(y) = x^6 * arctan(y[/tex]), we need to differentiate both sides of the equation with respect to x and solve for dy/dx.
Differentiating [tex]e^cos(y) = x^6 * arctan(y[/tex]) with respect to x using the chain rule, we get:
[tex]-d(sin(y)) * dy/dx * e^cos(y) = 6x^5 * arctan(y) + x^6 * d(arctan(y))/dy * dy/dx[/tex]
Simplifying the equation, we have:
[tex]-dy/dx * sin(y) * e^cos(y) = 6x^5 * arctan(y) + x^6 * (1/(1+y^2)) * dy/dx[/tex]
Now, let's solve for dy/dx:
[tex]-dy/dx * sin(y) * e^cos(y) - x^6 * (1/(1+y^2)) * dy/dx = 6x^5 * arctan(y)[/tex]
Factoring out dy/dx:
[tex]dy/dx * (-sin(y) * e^cos(y) - x^6 * (1/(1+y^2)))) = 6x^5 * arctan(y)[/tex]
Dividing both sides by (-sin(y) * e^cos(y) - x^6 * (1/(1+y^2)):
[tex]dy/dx = (6x^5 * arctan(y)) / (-sin(y) * e^cos(y) - x^6 * (1/(1+y^2)))[/tex]
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A store has determined that the number of Blu-ray movies sold monthly is approximately n(x)=6250(0.927x) movies re x is the average price in dollars. (a) Write the function for the model giving revenue in dollars, where x is the average price in dollars. R(x)= dollars (b) If each movie costs the store $10.00, write the function for the model that gives profit in dollars, where x is the average price in dollars. P(x)= dollars (c) Complete the table. (Round your answers to three decimal places.) Rates of Chanae of Revenue and Profit (d) What does the table indicate about the rate of change in revenue and the rate of change in profit at the same price? There is a range of prices beginning near $14 for which the rate of change of revenue is (revenue is ) while the rate of change of profit is ____).
Answers
(a) The function for the model giving revenue in dollars is R(x) = 6250(0.927x).
(b) If each movie costs the store $10.00, the function for the model that gives profit in dollars is P(x) = R(x) - 10x.
(c) Without the table provided, it is not possible to complete the rates of change of revenue and profit.
(d) The table indicates that there is a range of prices beginning near $14 for which the rate of change of revenue is constant (revenue is increasing at a steady rate), while the rate of change of profit is positive (profit is increasing). The specific values for the rates of change would need to be obtained from the provided table.
a) The function for the model giving revenue in dollars can be found by multiplying the number of movies sold (n(x)) by the average price per movie (x). Therefore, the function is R(x) = 6250(0.927x).
b) The profit in dollars can be calculated by subtracting the cost per movie from the revenue. Since each movie costs $10.00, the function for the model giving profit is P(x) = R(x) - 10n(x), where R(x) is the revenue function and n(x) is the number of movies sold.
c) Without a specific table provided, it is not possible to complete the table of rates of change of revenue and profit.
d) Based on the information given, we can observe that there is a range of prices beginning near $14 where the rate of change of revenue is decreasing (revenue is decreasing) while the rate of change of profit is positive. This indicates that although the revenue is decreasing, the profit is still increasing due to the decrease in cost per movie. The exact values for the rates of change cannot be determined without additional information or specific calculations.
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An LII system has an impulse response: \( \backslash\left(h(t)=e^{\wedge}\{\cdot(t-1)\} u(t-3) \cup\right. \) This system is: Select one: Not causal but stable Causal and stable Not causal and not sta
Answers
The correct answer is: Causal and stable. To analyze the causality and stability of the LTI (Linear Time-Invariant) system with impulse response [tex]\(h(t) = e^{-(t-1)}u(t-3)\)[/tex].
\(u(t)\) is the unit step function, which is 1 for [tex]\(t \geq 0\)[/tex] and 0 for [tex]\(t < 0\)[/tex].
1. Causality: A system is causal if the output at any given time depends only on past and present inputs, not on future inputs. In other words, the impulse response must be zero for \(t < 0\) since the system cannot "see" future inputs.
From the given impulse response, we see that \(h(t) = 0\) for \(t < 1\) (due to \(e^{-(t-1)}\)) and for \(t < 3\) (due to \(u(t-3)\)). This means that the system is causal.
2. Stability: A system is stable if its output remains bounded for all bounded inputs. In simpler terms, if the system does not exhibit unbounded growth when presented with finite inputs.
For stability, we need to check if the impulse response \(h(t)\) is absolutely integrable, which means that the integral of \(|h(t)|\) over the entire time axis should be finite.
Let's compute the integral of \(|h(t)|\) over the entire time axis:
[tex]\(\int_{-\infty}^{\infty} |h(t)| dt = \int_{-\infty}^{1} |e^{-(t-1)}u(t-3)| dt + \int_{1}^{\infty} |e^{-(t-1)}u(t-3)| dt\)[/tex]
Since \(u(t-3) = 0\) for \(t < 3\), the first integral becomes:
[tex]\(\int_{-\infty}^{1} |e^{-(t-1)}u(t-3)| dt = \int_{-\infty}^{1} |0| dt = 0\)[/tex]
For \(t \geq 1\), \(u(t-3) = 1\), so the second integral becomes:[tex]\(\int_{1}^{\infty} |e^{-(t-1)}u(t-3)| dt = \int_{1}^{\infty} |e^{-(t-1)}| dt\)[/tex]
Now, \(e^{-(t-1)}\) is a decaying exponential function for \(t \geq 1\), which means it converges to 0 as \(t\) approaches infinity. Therefore, the integral above is finite.
Since the integral of \(|h(t)|\) over the entire time axis is finite, the system is stable. So, the correct answer is: Causal and stable.
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I need the answer please
Answers
The magnitude of the resultant force is approximately 57.60 pounds, and the direction is approximately -85.24 degrees (measured counterclockwise from the positive x-axis).
To find the magnitude and direction of the resultant force when the three force vectors are added together, we can use vector addition.
Convert the angles to radians.
Angle of wolf 1 = 45 degrees = π/4 radians
Angle of wolf 2 = 90 degrees = π/2 radians
Angle of wolf 3 = 230 degrees = (230/180)π radians
Resolve the forces into horizontal and vertical components.
Horizontal component of wolf 1 = 150 * cos(π/4) ≈ 106.07 pounds
Vertical component of wolf 1 = 150 * sin(π/4) ≈ 106.07 pounds
Horizontal component of wolf 2 = 200 * cos(π/2) = 0 pounds
Vertical component of wolf 2 = 200 * sin(π/2) = 200 pounds
Horizontal component of wolf 3 = 300 * cos((230/180)π) ≈ -112.36 pounds
Vertical component of wolf 3 = 300 * sin((230/180)π) ≈ -248.69 pounds
Sum the horizontal and vertical components of the forces.
Horizontal component of resultant force = 106.07 + 0 - 112.36 ≈ -6.29 pounds
Vertical component of resultant force = 106.07 + 200 - 248.69 ≈ 57.38 pounds
Find the magnitude of the resultant force using the Pythagorean theorem.
Magnitude of resultant force = √((-6.29)^2 + (57.38)^2) ≈ 57.60 pounds
Find the direction of the resultant force using the inverse tangent function.
Direction of resultant force = atan(57.38 / -6.29) ≈ -85.24 degrees
Therefore, the magnitude of the resultant force is approximately 57.60 pounds, and the direction is approximately -85.24 degrees (measured counterclockwise from the positive x-axis).
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Form 1: \( 2 e^{-i / 1}+1 e^{-1 / n}+3 \) Form 2: \( \operatorname{Cte}^{-1 / n}+3 e^{-1 / \pi}+3 \) Form 3: \( 3 e^{-1 / t} \) con \( (\omega f)+e^{-1 / 7} \sin (\omega t)+3 \) exponential time const
Answers
The three forms given represent exponential time constants and a rational frequency.The rational frequency term in these forms represents the frequency of the oscillation. For example, in Form 3, the rational frequency term is ωf, which means that the frequency of the oscillation is ω times the frequency of the input signal f.
Form 1: 2e ^−i/1 +1e ^−1/n +3 is a sum of two exponential terms, one with a time constant of 1 and one with a time constant of n. The time constant of an exponential term is the rate at which the term decays over time.
Form 2: Cte ^−1/n +3e ^−1/π +3 is a sum of three exponential terms, one with a time constant of n, one with a time constant of π, and a constant term.
Form 3: 3e ^−1/t con (ωf)+e ^−1/7 sin(ωt)+3 is a sum of an exponential term with a time constant of t, a sinusoidal term with frequency ω, and a constant term. The frequency of a sinusoidal term is the rate at which the term oscillates over time.
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write the following expression as a function of an acute angle. cos (125°) -cos55° cos35° cos55°
Answers
The expression cos (125°) - cos 55° cos 35° cos 55° can be written as cos (55°) + cos (55°) cos (35°) cos (55°).
cos (125°) can be rewritten as cos (180° - 125°). Similarly, cos (35°) can be rewritten as cos (180° - 35°). Therefore, the expression can be written as:
cos (180° - 125°) - cos (55°) cos (180° - 35°) cos (55°)
Simplifying further, we have:
cos (55°) - cos (55°) cos (145°) cos (55°)
Since 145° is the supplement of 35°, we can rewrite it as:
cos (55°) - cos (55°) cos (180° - 35°) cos (55°)
Now, cos (180° - 35°) is equal to -cos (35°). Therefore, the expression becomes:
cos (55°) + cos (55°) cos (35°) cos (55°)
Hence, the expression as a function of an acute angle is:
cos (55°) + cos (55°) cos (35°) cos (55°)
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There are only blue counters, red counters and green counters in a box. The probability that a counter taken at random from the box will be blue is 0.4 The ratio of the number of red counters to the number of green counters is 7 : 8 Sameena takes at random a counter from the box. She records its colour and puts the counter back in the box. Sameena does this a total of 50 times. Work out an estimate for the number of times she takes a green counter.
Answers
Based on the given information, we estimated that the probability Sameena takes a blue counter 20 times and takes a green counter approximately 27 times out of 50 draws.
Let's break down the problem step by step to estimate the number of times Sameena takes a green counter.
Probability of drawing a blue counter:
Given that the probability of drawing a blue counter is 0.4, we can estimate that Sameena takes a blue counter approximately 0.4 * 50 = 20 times.
Ratio of red counters to green counters:
The ratio of red counters to green counters is given as 7:8. This means that for every 7 red counters, there are 8 green counters. We can use this ratio to estimate the number of green counters.
Let's assume there are 7x red counters and 8x green counters in the box. The total number of counters would then be 7x + 8x = 15x.
Probability of drawing a green counter:
To estimate the probability of drawing a green counter, we need to calculate the proportion of green counters in the total number of counters. The proportion of green counters is 8x / (7x + 8x) = 8x / 15x = 8/15.
Estimating the number of times Sameena takes a green counter:
Using the estimated probability of drawing a green counter (8/15), we can estimate the number of times Sameena takes a green counter as approximately (8/15) * 50 = 26.7 (rounded to the nearest whole number).
Therefore, an estimate for the number of times Sameena takes a green counter is 27.
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Let f(x)=4x2−3x−7. The secant line through (2,f(2)) and (2+h,f(2+h)) has slope 4h+13. Use this formula to compute the slope of the given lines.
Find the slope of the secant line through (2,f(2)) and (3,f(3)). (Give your answer as a whole or exact number.)
Answers
The slope of the secant line through the points (2, f(2)) and (3, f(3)) is 17.
Given the function f(x) = 4[tex]x^{2}[/tex] - 3x - 7, we are asked to find the slope of the secant line passing through the points (2, f(2)) and (3, f(3)). To find the slope using the formula provided, we need to substitute the values into the formula 4h + 13, where h represents the difference in x-coordinates between the two points.
In this case, the x-coordinates are 2 and 3, so the difference h is equal to 3 - 2 = 1. Plugging this value into the formula, we get 4(1) + 13 = 17. Therefore, the slope of the secant line passing through the points (2, f(2)) and (3, f(3)) is 17.
The formula for the slope of a secant line, 4h + 13, represents the difference in the function values divided by the difference in the x-coordinates. By substituting the appropriate values, we can calculate the slope. In this case, we consider the points (2, f(2)) and (3, f(3)), where the x-coordinates differ by 1. Plugging this value into the formula yields 4(1) + 13 = 17, which gives us the slope of the secant line. Therefore, the slope of the secant line through the given points is 17.
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Use the Laplace transform to solve the given system of differential equations.
dx/dt = 3y+e ^t
dy/dt =12x-t
x(0)=1 , y(0)=1
x(t)= ______
y(t)= ______
Answers
Applying the inverse Laplace transform, we get:
[tex]y(t) = 4sin3t + 4cos3t + (1/3)(1 + 3t + 3e^-3t)[/tex]
Now, substituting the value of L(x) from equation (5) into equation (3), we get: [tex]x(t) = [3L(y) - e/s] / s2[/tex]
Applying the Laplace transform to the first equation (1), we get:[tex]sL(x) - x(0) = 3L(y) / s - e/s[/tex]
where x(0) = 1
and y(0) = 1.
Substituting the initial condition in the above equation, we get:[tex]sL(x) - 1 = 3L(y) / s - e/s ....[/tex] (3)
Similarly, applying the Laplace transform to the second equation (2),
we get: [tex]sL(y) - y(0) = 12L(x) / s2 + 1 - 1/s[/tex]
where[tex]x(0) = 1 and y(0) = 1[/tex].
Substituting the initial condition in the above equation,
Substituting the value of L(x) from equation (5) into equation (6),
we get: [tex]12(3s/[(s2+1)(s2+3)] - 12e/s(s2+1)(s2+3)) = sL(y) - 1 + 12/s2+1[/tex]
We get:[tex]L(y) = s(576s2 + 1728)/(s4 + 6s2 + 9) + (s2 + 1)/[s(s2+3)(s2+1)][/tex]
Applying the inverse Laplace transform, we get:
[tex]y(t) = 4sin3t + 4cos3t + (1/3)(1 + 3t + 3e^-3t)[/tex]
Now, substituting the value of L(x) from equation (5) into equation (3), we get: [tex]x(t) = [3L(y) - e/s] / s2[/tex]
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Simplify (g(b)-g(a))/(b-a) for the function g(x) = 1/5x
Answers
The value of the expression (g(b)-g(a))/(b-a) when fucntion g(x) = 1/5x is
-1/(5ab).
The given function is,
g(x) = 1/5x,
Evaluate g(b) and g(a) as follows:
g(b) = 1/(5b)
g(a) = 1/(5a)
Substituting these values into the expression (g(b)-g(a))/(b-a), we get:
(g(b)-g(a))/(b-a) = ((1/(5b)) - (1/(5a))/(b-a)
Simplifying this expression,
Factor out 1/5 from the numerator:
((1/5 b) - (1/5 a))/(b-a) = (1/5) (1/b-1/a)/(b-a)
= (1/5)(a-b)/(ab(b-a))
= -(1/5)(b-a)/(ab(b-a))
= -1/(5ab)
Hence the value of the given expression is,
(g(b)-g(a))/(b-a) = -1/(5ab)
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The marginal cost of a product is given by 204+76/√x dollars per unit, where x is the number of units produced. The current level of production is 151 units weekly. If the level of production is increased to 271 units weekly, find the increase in the total costs. Round your answer to the nearest cent.
Answers
The increase in total costs, when the level of production is increased from 151 units to 271 units weekly, is approximately $24,677.10.
To find the increase in total costs, we need to calculate the total cost at the current level of production and the total cost at the increased level of production, and then subtract the former from the latter.
First, let's calculate the total cost at the current level of production, which is 151 units per week. We can find the total cost by integrating the marginal cost function over the range from 0 to 151 units:
Total Cost = ∫(204 + 76/√x) dx from 0 to 151
Integrating the function gives us:
Total Cost = 204x + 152(2√x) evaluated from 0 to 151
Total Cost at 151 units = (204 * 151) + 152(2√151)
Now, let's calculate the total cost at the increased level of production, which is 271 units per week:
Total Cost = ∫(204 + 76/√x) dx from 0 to 271
Integrating the function gives us:
Total Cost = 204x + 152(2√x) evaluated from 0 to 271
Total Cost at 271 units = (204 * 271) + 152(2√271)
Finally, we can calculate the increase in total costs by subtracting the total cost at the current level from the total cost at the increased level:
Increase in Total Costs = Total Cost at 271 units - Total Cost at 151 units
Performing the calculations, we have:
Total Cost at 271 units = (204 * 271) + 152(2√271) = 55384 + 844.39 ≈ 56228.39 dollars
Total Cost at 151 units = (204 * 151) + 152(2√151) = 30904 + 647.29 ≈ 31551.29 dollars
Increase in Total Costs = 56228.39 - 31551.29 ≈ 24677.10 dollars
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3. Consider the causal discrete system defined by the following differences equation: y(n)=5x(n)-2x(n-1)-x(n-2)-y(n-1) Assuming that the system is sleeping, determine the system response, with n up to 5, at the input x(n)= 28(n)+8(n-1)-8(n-3) (2 v.) Write the frequency response of the system, H(z). (1 v.) In the z plane, represent zeros, poles and the region of convergence (ROC). (1 v.) a) b) c)
Answers
The system response, y(n), for the given input x(n) up to n = 5 is as follows: y(0) = 5x(0) - 2x(-1) - x(-2) - y(-1), y(1) = 5x(1) - 2x(0) - x(-1) - y(0), y(2) = 5x(2) - 2x(1) - x(0) - y(1), y(3) = 5x(3) - 2x(2) - x(1) - y(2), y(4) = 5x(4) - 2x(3)-x(2) - y(3), y(5) = 5x(5) - 2x(4) - x(3) - y(4).
To calculate y(n), we substitute the given values of x(n) and solve the equations iteratively. The initial conditions y(-1) and y(0) need to be known to calculate subsequent values of y(n). Without knowing these initial conditions, we cannot determine the exact values of y(n) for n up to 5.
The frequency response of the system, H(z), can be obtained by taking the Z-transform of the given difference equation. However, since the equation provided is a time-domain difference equation, we cannot directly determine the frequency response without taking the Z-transform.
To represent the zeros, poles, and the region of convergence (ROC) in the z-plane, we need the Z-transform of the given difference equation. Without the Z-transform, it is not possible to determine the locations of zeros and poles, nor the ROC of the system.
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If the point (1, 4) is on the graph of an equation, which statement must be
true?
OA. The values x = 1 and y = 4 make the equation true.
B. The values x = 1 and y = 4 are the only values that make the
equation true.
C. The values x = 4 and y= 1 make the equation true.
D. There are solutions to the equation for the values x = 1 and x = 4.
Answers
The statement that must be true is (a) the values x = 1 and y = 4 make the equation true.
How to determine the statement that must be true?From the question, we have the following parameters that can be used in our computation:
The point (1, 4) is on the graph of an equation
This means that
x = 1 and y = 4
The above does not represent the only value that make the equation true.
However, the point can make the equation true
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Find the sum of the infinite geometric series below. k=1∑[infinity] 16(21)k
Answers
The sum of the infinite geometric series can be found using the formula S = a / (1 - r), where 'a' is the first term and 'r' is the common ratio. In this case, the first term 'a' is 16 and the common ratio 'r' is 1/21. Substituting these values into the formula, we have:
S = 16 / (1 - 1/21)
To simplify the expression, we need to find a common denominator:
S = 16 / (21/21 - 1/21)
= 16 / (20/21)
= 16 * (21/20)
= 336/20
= 16.8
Therefore, the sum of the infinite geometric series 16(1/21)^k is equal to 16.8.
In more detail, we can observe that the given series is a geometric series with a common ratio of 1/21. This means that each term is obtained by multiplying the previous term by 1/21. The first term of the series is 16.
To find the sum of an infinite geometric series, we can use the formula S = a / (1 - r), where 'a' is the first term and 'r' is the common ratio. Substituting the given values into the formula, we get:
S = 16 / (1 - 1/21)
To simplify the expression, we need to find a common denominator for the denominator:
S = 16 / (21/21 - 1/21)
= 16 / (20/21)
Now, to divide by a fraction, we can multiply by its reciprocal:
S = 16 * (21/20)
= 336/20
= 16.8
Hence, the sum of the infinite geometric series 16(1/21)^k is equal to 16.8.
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Find the derivative of the function.
f(x) = (5x3 + 4x)(x − 3)(x + 1)
Answers
The derivative of the function f(x) = (5x^3 + 4x)(x - 3)(x + 1) can be found using the product rule and the chain rule.
f'(x) = (15x^2 + 4)(x - 3)(x + 1) + (5x^3 + 4x)[1 + (x - 3) + (x + 1)]
First, let's apply the product rule to differentiate the function f(x) = (5x^3 + 4x)(x - 3)(x + 1). The product rule states that the derivative of the product of two functions u(x) and v(x) is given by u'(x)v(x) + u(x)v'(x).
Let u(x) = 5x^3 + 4x and v(x) = (x - 3)(x + 1).
Applying the product rule, we have:
f'(x) = u'(x)v(x) + u(x)v'(x)
To find u'(x), we differentiate u(x) = 5x^3 + 4x with respect to x:
u'(x) = 15x^2 + 4
To find v'(x), we differentiate v(x) = (x - 3)(x + 1) with respect to x:
v'(x) = (1)(x + 1) + (x - 3)(1)
= x + 1 + x - 3
= 2x - 2
Now, we substitute the values into the product rule formula:
f'(x) = (15x^2 + 4)(x - 3)(x + 1) + (5x^3 + 4x)(2x - 2)
Simplifying further, we get:
f'(x) = (15x^2 + 4)(x - 3)(x + 1) + (5x^3 + 4x)(2x - 2)
Therefore, f'(x) = (15x^2 + 4)(x - 3)(x + 1) + (5x^3 + 4x)(2x - 2).
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A golf ball is driven so that its height in feet
after t seconds is s (t) = -16t- + 48t + 20 . Find the maximum
height of the golf ball. O 56 feet O 20 feet O 1.5 feet O -88 feet
Answers
The maximum height of the golf ball is 56 feet, as determined by the equation s(t) = -16t^2 + 48t + 20.
To find the maximum height of the golf ball, we can determine the vertex of the parabolic function representing its height.
The function s(t) = -16t^2 + 48t + 20 is a downward-opening parabola since the coefficient of t^2 is negative.
The vertex of the parabola can be found using the formula t = -b / (2a),
where a and b are the coefficients of the quadratic equation. In this case, a = -16 and b = 48.
Calculating t = -48 / (2*(-16)) gives t = 1.5 seconds.
Substituting this value into the equation s(t) gives s(1.5) = -16(1.5)^2 + 48(1.5) + 20 = 56 feet.
Therefore, the maximum height of the golf ball is 56 feet.
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Shane's retirement fund has an accumulated amount of $45,000. If it has been earning interest at 2.19% compounded monthly for the past 24 years, calculate the size of the equal payments that he deposited at the beginning of every 3 months.
Round to the nearest cent
Answers
The equal payments that Shane deposited at the beginning of every 3 months can be calculated to be approximately $218.47.
To find the size of the equal payments that Shane deposited, we can use the formula for the accumulated amount of a series of equal payments with compound interest. The formula is:
A = P * (1 + r/n)^(nt) / ((1 + r/n)^(nt) - 1),
where A is the accumulated amount, P is the payment amount, r is the interest rate, n is the number of times interest is compounded per year, and t is the number of years.
In this case, we are given A = $45,000, r = 2.19% (or 0.0219 as a decimal), n = 12 (since interest is compounded monthly), and t = 24 years.
We need to solve the formula for P. Rearranging the formula, we have:
P = A * ((1 + r/n)^(nt) - 1) / ((1 + r/n)^(nt)).
Substituting the given values, we can calculate P to be approximately $218.47. Therefore, Shane deposited approximately $218.47 at the beginning of every 3 months.
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A population of crabs is growing according to the logistic growth equation, with r=1.1 and carrying capacity of 500crabs. At which population size will the population grow the fastest? In a year tracking a population of widowbirds, you recorded that 150 individuals were born, 75 birds died. If λ=2, how many birds were there when you started tracking the population?
Answers
The population will grow the fastest at half of the carrying capacity, which is 250 crabs.
In the logistic growth equation, the population growth rate is highest when the population is at half of the carrying capacity. This is because, at this point, there is a balance between birth rates and death rates, maximizing the net population growth.
For the given logistic growth equation with a carrying capacity of 500 crabs, the population will grow the fastest at half of the carrying capacity, which is 250 crabs.
Regarding the second question, to determine the initial population size of widowbirds when tracking started, we can use the equation λ = (births - deaths) / initial population.
Given that 150 individuals were born and 75 birds died during the tracking period, and λ is equal to 2, we can solve the equation for the initial population.
2 = (150 - 75) / initial population
Multiplying both sides by the initial population:
2 * initial population = 150 - 75
2 * initial population = 75
Dividing both sides by 2:
initial population = 75 / 2
initial population = 37.5
Since population size cannot be a decimal, we round down to the nearest whole number.
Therefore, when tracking the population of widowbirds, the initial population size would be approximately 37 birds.
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You and your coworker together make $16 per hour. You know your coworker earns 10 percent more than you do. Your hourly wage is $ ___. After taking Math 1010 your hourly wage is raised to $12. This is a raise of ___ %. After returning to work you can't help mentioning casually to your coworker that now you make ___ % more than he does. He responds wistfully that this is as it should be since now you can figure problems like the ones on this assignment!
Answers
After taking Math 1010, their hourly wage increases to $12, which is a raise of 20%. They now make 20% more than their coworker. the person's new wage is $12 and the coworker's wage is $11, the person now makes ($12 - $11) / $11 * 100 ≈ 9.09% more than the coworker.the raise is 57.4%.
The hourly wage of the person is $10, while their coworker earns 10% more, making it $11 per hour.
Let's denote the person's hourly wage as x. According to the given information, the coworker earns 10% more than the person. This means the coworker's hourly wage is x + 0.10x = 1.10x.
Together, they make $16 per hour, so their combined wages are x + 1.10x = 2.10x. Since this equals $16, we can solve for x: 2.10x = $16, which gives x = $7.62.
After taking Math 1010, the person's hourly wage increases to $12. The raise amount can be calculated as the difference between the new wage and the previous wage, which is $12 - $7.62 = $4.38. To calculate the raise percentage, we divide the raise amount by the previous wage and multiply by 100: (4.38 / 7.62) * 100 ≈ 57.4%. Therefore, the raise is approximately 57.4%.
Since the person's new wage is $12 and the coworker's wage is $11, the person now makes ($12 - $11) / $11 * 100 ≈ 9.09% more than the coworker.
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A mineral deposit along a strip of length 6 cm has density s(x)=0.02x(6−x)g/cm for 0≤x≤6.
M=
Answers
To find the mass (M) of a mineral deposit along a strip of length 6 cm, with density s(x) = 0.02x(6-x) g/cm for 0 ≤ x ≤ 6, we can integrate the density function over the interval [0, 6]. the mass of the mineral deposit along the 6 cm strip, with the given density function, is 0.72 g.
The density of the mineral deposit is given by the function s(x) = 0.02x(6-x) g/cm, where x represents the position along the strip of length 6 cm. The function describes how the density of the mineral deposit changes as we move along the strip.
To find the total mass (M) of the mineral deposit, we integrate the density function s(x) over the interval [0, 6]. The integral represents the accumulation of the density function over the entire length of the strip.
Using the given density function, the integral for the mass is:
M = ∫[0, 6] 0.02x(6-x) dx
Evaluating the integral:
M = 0.02 ∫[0, 6] (6x - x^2) dx
M = 0.02 [(3x^2 - (x^3)/3)] |[0, 6]
M = 0.02 [(3(6^2) - (6^3)/3) - (3(0^2) - (0^3)/3)]
M = 0.02 [(3(36) - (216)/3) - (0 - 0)]
M = 0.02 [(108 - 72) - 0]
M = 0.02 (36)
M = 0.72 g
Therefore, the mass of the mineral deposit along the 6 cm strip, with the given density function, is 0.72 g.
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Use the intermediate Value theorem to guarantee that F(C)=11 on the given interval F(X) = x^2 + x - 1 Interval [0,5) F(C)=11
Answers
Since the function F(x) = x^2 + x - 1 is continuous on the interval [0, 5), and
F(0) < 11 < F(5), the Intermediate Value Theorem guarantees the existence of at least one value C in the interval (0, 5) such that
F(C) = 11.
To use the Intermediate Value Theorem to guarantee that F(C) = 11 on the interval [0, 5), we need to show that there exists a value C in the interval [0, 5) such that
F(C) = 11.
First, let's calculate the values of F(x) for the endpoints of the interval:
F(0) = (0)^2 + (0) - 1
= -1,
F(5) = (5)^2 + (5) - 1
= 29.
Since F(0) = -1 and
F(5) = 29, we have
F(0) < 11 and F(5) > 11.
Now, since the function F(x) = x^2 + x - 1 is continuous on the interval [0, 5), and F(0) < 11 < F(5),
the Intermediate Value Theorem guarantees the existence of at least one value C in the interval (0, 5) such that F(C) = 11.
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The information shown below gives the equation of a hyperbola and how many units up or down and to the right or left the hyperbola is to be shifted. Find an equation for the new hyperbola, and find the new center, foci, vertices, and asymptotes. y2−x2=1, right 1 , down 1 Write an equation for the new hyperbola in standard form. =1 Find the center of the new hyperbola. (Type an ordered pair.) The foci of the new hyperbola are (Type ordered pairs. Use a comma to separate answers as needed. Type an exact answer for each coordinate, using radicals as needed.) What are the vertices? (Type ordered pairs. Use a comma to separate answers as needed. Type an exact answer for each coordinate, using radicals as needed.) What are the equations of the hyperbola's asymptotes? A. y+1=±(x−1) B. x+1=±(y−1) C. x−1=±(y+1) D. y−1=±(x+1)
Answers
The equations of the hyperbola's asymptotes are:y + 1 = +/- (x - 1). The correct option is A.
The information given is:
y² - x² = 1
We can start with the initial standard equation of the hyperbola with center at (0, 0)
y² / a² - x² / b² = 1
We can also note that in the equation given that y² is positive, therefore a² is 1 and b² is -1.
We can substitute these values and the shifts given into the initial equation and get:
y² / 1 - x² / -1 = 1
So, the new equation of the hyperbola in standard form is:
y² - x² = -1
To find the center, we can note that the center shifted 1 unit to the right and 1 unit down from the origin.
Therefore, the new center is (1, -1).Next, we can use the formula to find the distance from the center to each focus:
c = sqrt(a² + b²)
= sqrt(1 - 1)
= 0
The distance from the center to each vertex is a = 1.
Now, we can find the foci, since we know that the foci lie along the axis of the hyperbola and are a distance c from the center. The distance from the center to each focus is 0, so the foci are at (1, -1) and (1, -1).
The vertices lie on the same axis as the foci and are a distance a from the center.
The vertices are at (1, 0) and (1, -2).
Finally, the equations of the asymptotes are:
y + 1 = +/- x - 1Or, written in slope-intercept form:
y = +/- x - 2
The center is (1, -1)
The foci are at (1, 0) and (1, -2)
The vertices are at (1, -1) and (1, -3)
The correct option is A.
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Find the particular solution to this equation:
\( x[n]=2: \) \( \quad y[n]-(9 / 16) y[n-2]=x[n-1] \)
Answers
The particular solution to the difference equation y[n] - (9/16) y[n-2] = x[n-1] with x[n] = 2 is y[n] = 2 - (3/4)^n. The first step to solving the difference equation is to find the homogeneous solution. The homogeneous solution is the solution to the equation y[n] - (9/16) y[n-2] = 0.
This equation can be solved using the Z-transform, and the solution is y[n] = C1 (3/4)^n + C2 (-3/4)^n, where C1 and C2 are constants. The particular solution to the equation is the solution that satisfies the initial condition x[n] = 2. The particular solution can be found using the method of undetermined coefficients. In this case, the particular solution is y[n] = 2 - (3/4)^n.
The method of undetermined coefficients is a method for finding the particular solution to a differential equation. In this case, the method of undetermined coefficients involves assuming that the particular solution is of the form y[n] = an + b. The coefficients a and b are then determined by substituting the assumed solution into the difference equation.
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Evaluate the step response given in Eq. (2.40) at \( t=t_{0}+\tau \) and compare it with Eq. (2.35).
\( \omega_{l}(t)=K A_{v}\left(1-e^{\left(-\frac{t-t_{0}}{\tau}\right)}\right)+\omega_{l}\left(t_{0
Answers
t = t0 + τ, the response of equation (2.40) is not equal to KAv, which is the case in equation (2.35).
Given, the step response is \(\omega_l(t)=K A_v\left(1-e^{(-\frac{t-t_0}{\tau})}\right)+\omega_l(t_0)\)............(2.40)
And, the equation (2.35) is given by \(\omega_l(t)=K A_v\)
Substituting \(t=t_0+\tau\) in equation (2.40), we get;$$\begin{aligned}\omega_l(t_0+\tau)&=K A_v\left(1-e^{(-\frac{(t_0+\tau)-t_0}{\tau})}\right)+\omega_l(t_0)\\\omega_l(t_0+\tau)&=K A_v\left(1-e^{(-\frac{\tau}{\tau})}\right)+\omega_l(t_0)\\\omega_l(t_0+\tau)&=K A_v\left(1-e^{-1}\right)+\omega_l(t_0)\\\omega_l(t_0+\tau)&=K A_v\times0.632+\omega_l(t_0)\end{aligned}$$
Therefore, the step response of equation (2.40) at \(t=t_0+\tau\) is given by:
$$\omega_l(t_0+\tau)=K A_v\times0.632+\omega_l(t_0)$$
Comparing it with equation (2.35), we have $$\omega_l(t_0+\tau)=0.632\omega_l(t_0)+\omega_l(t_0)$$
So, we see that the response of the equation (2.40) has some time delay because it contains exponential factor e^(-t/τ), while the response of equation (2.35) does not have any time delay.
Also, at t = t0 + τ, the response of equation (2.40) is not equal to KAv, which is the case in equation (2.35).
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"A clothing manufacturer has determined that the cost of producing T-shirts is $2 per T-shirt plus $4480 per month in fixed costs. The clothing manufacturer sells each T-shirt for $30
Find the break-even point."
Answers
The break-even point is 160 T-shirts.
Break-even point is a critical metric used to determine how many goods or services a business must sell to cover its expenses.
It is calculated by dividing the total fixed costs by the contribution margin, which is the difference between the selling price and the variable cost per unit.
Here's how to calculate the break-even point in this problem:
Variable cost per unit = Cost of producing one T-shirt = $2Selling price per unit = $30
Contribution margin = Selling price per unit - Variable cost per unit= $30 - $2 = $28Fixed costs = $4480
Break-even point = Fixed costs / Contribution margin= $4480 / $28= 160
Therefore, the break-even point is 160 T-shirts.
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The first five terms of the recursive sequence
a₁ = 4,a_n+1= -a_n
are
• 4,-4, 4, -4, 4
• 4, -16, 64, -256, 1024
• -4, 4, -4, 4, -4
• 4, 0, -4,-8, -12
Answers
The first five terms of the recursive sequence a₁ = 4, a_{n+1} = -a_n are:4, -4, 4, -4, 4.
To find the second term, we need to use the recursive formula a_{n+1} = -a_n. Since the first term is given as a₁ = 4, the second term is:
a₂ = -a₁ = -4
Using this value of a₂, we can find a₃:
a₃ = -a₂ = -(-4) = 4
Now we can use a₃ to find a₄:
a₄ = -a₃ = -4
Finally, using a₄, we can find a₅:
a₅ = -a₄ = -(-4) = 4
Therefore, the first five terms of the sequence are 4, -4, 4, -4, 4.
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There are 7 2500K LED luminaires and 5 4500K LED luminaires (ALL DIFFERENT). The assembly of 7 luminaires will be carried out. How many is feasible if you must have 4 DIFFERENT 2500K. and 3 DIFFERENT 4500K.
Answers
The number of feasible combinations can be calculated by selecting 4 different luminaires from the available 2500K LED luminaires (7 options) and selecting 3 different luminaires from the available 4500K LED luminaires (5 options).
To calculate the number of feasible combinations, we use the concept of combinations. The number of ways to select k items from a set of n items without regard to the order is given by the binomial coefficient, denoted as "n choose k" or written as C(n, k).
For the 2500K LED luminaires, we have 7 options available, and we need to select 4 different luminaires. Therefore, the number of ways to select 4 different 2500K LED luminaires is C(7, 4).
Similarly, for the 4500K LED luminaires, we have 5 options available, and we need to select 3 different luminaires. Therefore, the number of ways to select 3 different 4500K LED luminaires is C(5, 3).
To find the total number of feasible combinations, we multiply the number of combinations for each type of luminaire: C(7, 4) * C(5, 3).
Calculating this expression, we get the total number of feasible combinations of luminaires that satisfy the given conditions.
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Consider the one-country model of technology and growth. Suppose that L=1,μ=5, and γA=0.5. Further, assume the initial value of A is also 1 . (a) Calculate both the level of output per worker and the growth rate of output per worker. (b) Now suppose that YA is raised to 0.75. What would be the new levels of output per worker and the new growth of output per worker? (c) How many years will it take before output per worker returns to the level it would have reached if ψA had remained constant?
Answers
When YA is raised to 0.75, the level of output per worker remains 1, but the growth rate decreases to approximately 0.464.
To calculate the level of output per worker and the growth rate of output per worker in the one-country model of technology and growth, we'll use the following equations:
Output per worker (y) = A^(1/(1-μ))
Growth rate of output per worker (g) = γA^(1/(1-μ))
Given the values L=1, μ=5, γ=0.5, and initial value of A=1, let's calculate the initial level of output per worker and growth rate:
(y_initial) = A^(1/(1-μ)) = 1^(1/(1-5)) = 1
(g_initial) = γA^(1/(1-μ)) = 0.5 * 1^(1/(1-5)) = 0.5
(a) The initial level of output per worker is 1, and the initial growth rate of output per worker is 0.5.
Now, let's consider the case where YA is raised to 0.75:
(y_new) = A^(1/(1-μ)) = 1^(1/(1-5)) = 1
(g_new) = γA^(1/(1-μ)) = 0.5 * 0.75^(1/(1-5)) ≈ 0.464
(b) The new level of output per worker remains 1, but the new growth rate of output per worker decreases to approximately 0.464.
To determine the number of years it will take for output per worker to return to its initial level, we need to find the time it takes for A to reach its initial value of 1. Since the growth rate of output per worker is given by g = γA^(1/(1-μ)), we can rearrange the equation as follows:
A = (g/γ)^(1-μ)
To find the time it takes for A to reach 1, we need to solve for t in the equation:
1 = (g/γ)^(1-μ)t
(c) The number of years it will take for output per worker to return to its
initial level depends on the values of g, γ, and μ. By solving the equation above for t, we can determine the time it takes for output per worker to return to its initial level.
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