Name: SUMMER II, 2014 MATH 142:203 QUIZ - 7

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Name:
SUMMER II, 2014
MATH 142:203
QUIZ - 7
• This is a group quiz, in class, open notes, open books.
• Read each question carefully, answer each question completely, box your answers.
• Show all of your work; no credit will be given for unsupported answers.
1) Find the derivatives of these functions:
a) (3 pts)
√
f (x) = π
2x+1
.
b) (3 pts)
g(x) = log5 (xe3x ).
2) Given
E(p) =
p
.
50 − p
a) (2 pts) Is the demand elastic or inelastic when p = 30?
b) (2 pts) If the price is decreased by 20%, what is the approximate change in demand?
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