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Calculus help marginal demand

label Calculus
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suppose demand for certain item is modeled f(x) = -3p + 21p +10 where p is price of item in dollars.

current the price of item is $5.

Use marginal demand to estimate the change in demand when price is increased by 1 dollar. 

i got -12 

A. -9

B. -12

C. 28

D. 40

Apr 13th, 2015

suppose demand for certain item is modeled f(x) = -3p + 21p +10 where p is price of item in dollars.

current the price of item is $5.

Use marginal demand to estimate the change in demand when price is increased by 1 dollar. 


df/dp = -6p+21 

p= 5 

df/dp = -30+21 = -9


Apr 13th, 2015

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Apr 13th, 2015
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Apr 13th, 2015
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