Solve the problem.Let f(x) compute the cost of a rental car after x days of use 
per day. What does 
compute?
A. The cost of rental for 42 days
B. The number of days rented for 42 dollars
C. The cost of rental for x days
D. The number of days rented for x dollars
Answer: D
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Solve.
n = 4
A. 8 B. 0 C. 20 D. 9
Find the unit tangent vector of the given curve.r(t) = (4t cos t - 4 sin t)j + (4t sin t + 4 cos t)k
A. T = - 
(sin t)j + 
(cos t)k
B. T = (4 cos t)j - (4 sin t)k
C. T = (-4 sin t)j + (4 cos t)k
D. T = (-sin t)j + (cos t)k
Find the extreme values of the function subject to the given constraint.
A. Maximum: 77 at 
minimum: 13 at 
B. Maximum: 81 at 
minimum: 9 at 
C. Maximum: 49 at 
minimum: 41 at 
D. Maximum: 77 at 
minimum: 13 at 
Solve the problem.The intensity I of light varies inversely as the square of the distance D from the source. If the intensity of illumination on a screen 5 feet from a light is 4 foot candles, find the intensity on a screen 20 feet from the light.
A. 
foot-candles
B. 1
foot-candles
C. 
foot-candles
D. 2 foot-candles