Revenue Growth The demand for the Cyberpunk II arcade video game is modeled by the logistic curve q ( t ) = 10 , 000 1 + 0.5 e − 0.4 t , where q ( t ) is the total number of units sold t months after its introduction. a. Use technology to estimate q ' ( 4 ) . b. Assume that the manufacturers of Cyberpunk II sell each unit for $ 800 . What is the company’s marginal revenue d R / d q ? c. Use the chain rule to estimate the rate at which revenue is growing 4 months after the introduction of the video game.
Revenue Growth The demand for the Cyberpunk II arcade video game is modeled by the logistic curve q ( t ) = 10 , 000 1 + 0.5 e − 0.4 t , where q ( t ) is the total number of units sold t months after its introduction. a. Use technology to estimate q ' ( 4 ) . b. Assume that the manufacturers of Cyberpunk II sell each unit for $ 800 . What is the company’s marginal revenue d R / d q ? c. Use the chain rule to estimate the rate at which revenue is growing 4 months after the introduction of the video game.
Solution Summary: The author calculates the value of qprime (4) using technology.
(7) (12 points) Let F(x, y, z) = (y, x+z cos yz, y cos yz).
Ꮖ
(a) (4 points) Show that V x F = 0.
(b) (4 points) Find a potential f for the vector field F.
(c) (4 points) Let S be a surface in R3 for which the Stokes' Theorem is valid. Use
Stokes' Theorem to calculate the line integral
Jos
F.ds;
as denotes the boundary of S. Explain your answer.
(3) (16 points) Consider
z = uv,
u = x+y,
v=x-y.
(a) (4 points) Express z in the form z = fog where g: R² R² and f: R² →
R.
(b) (4 points) Use the chain rule to calculate Vz = (2, 2). Show all intermediate
steps otherwise no credit.
(c) (4 points) Let S be the surface parametrized by
T(x, y) = (x, y, ƒ (g(x, y))
(x, y) = R².
Give a parametric description of the tangent plane to S at the point p = T(x, y).
(d) (4 points) Calculate the second Taylor polynomial Q(x, y) (i.e. the quadratic
approximation) of F = (fog) at a point (a, b). Verify that
Q(x,y) F(a+x,b+y).
=
(6) (8 points) Change the order of integration and evaluate
(z +4ry)drdy .
So S√ ²
0
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