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

df/dp = -6p+21

p= 5

df/dp = -30+21 = -9

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