A manufacturer produces bolts of a fabric with a fixed width. A quantity q of this fabric (measured in yards) that is sold is a function of the selling price p (in dollars per yard), so we can write q=f(p). Then, the total revenue earned with selling price p is R(p)=pf(p).

Find R'(20), given f(20)=11000, and f'(20)= -450. (What does this mean?)

R'(20) =

Question

A manufacturer produces bolts of a fabric with a fixed width. A quantity q of this fabric (measured in yards) that is sold is a function of the selling price p (in dollars per yard), so we can write q=f(p). Then, the total revenue earned with selling price p is R(p)=pf(p). 

Find R'(20), given f(20)=11000, and f'(20)= -450. (What does this mean?) 

R'(20) =

anonymous · Answer

never mind the equation is R'(20)=-450p+1100 answer is 2000 by plugging in 20 into the equation -450p+1100