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Practice Test #3
Directions:
Use this practice test as a guide for your study for Test #3. This exam is
not
comprehensive, so study your class notes and homework problems in addition to completing this
exam. Solutions are posted on the course website under “Solutions”.
Directions:
Show all work for full credit. Correct answers without work shown to support the
answer will be awarded 0 points. Partial credit will be given where appropriate.
1)
The revenue function of a company is
10
4000
)
(
2
x
x
x
R
, where x is the number of units
produced and sold.
a)
Find the revenue for 20 units and for 21 units and the difference of revenues.
R(20) = _______________
R(21) = _______________
R(21) – R(20) = _____________
b)
Find the marginal revenue R’(x) and R’(20).
R’(x) = _______________
R’(20) = ____________
c)
What does R’(20) mean in terms of the situation?
d) Which is more accurate? R’(20) or R(21) – R(20)
(circle one)
Why?
2)
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 Spring '10
 Staff
 Calculus, Addition

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