Answer:

Step-by-step explanation:
We are given the following in the question:
Quantity, q
Selling price in dollars per yard, p

Total revenue earned =

f(20)=13000
This means that 13000 yards of fabric is sold when the selling price is 20 dollars per yard.
f′(20)=−550
This means that increasing the selling price by 1 dollar per yards there is a decrease in fabric sales by 550.
We have to find R'(20)
Differentiating the above expression, we have,

Putting the values, we get,

5 equals the whole number 5?
650* 2/100* 6
= 78
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3x+5y=10 and 5x-3y=-6 is perpendicular.
$60, Because 2% of $1000 is $20, and 20 x 3 is 60.