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3 years ago

Help plssssssssssssssssssss

Mathematics

1 answer:

Whitepunk [10]3 years ago

5 0

Answer: -74

Step-by-step explanation:

First you have to solve - 2y - 9 = 7 to find what "y" equals so we can plug that into 9y - 2

1. Solve -2y - 9 =7:

-2y = 16

y = -8

2. Plug -8 into the expression 9y - 2:

9(-8) - 2

-72 -2

-74!

Im sorry if i didnt do this correctly :/

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Answer:

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Step-by-step explanation:

We are given the following in the question:

Quantity, q

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This means that 13000 yards of fabric is sold when the selling price is 20 dollars per yard.

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This means that increasing the selling price by 1 dollar per yards there is a decrease in fabric sales by 550.

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Differentiating the above expression, we have,

$R'(p) = \displaystyle\frac{d(R(p))}{dp} = \frac{d(pf(p))}{dp} = f(p) + pf'(p)$

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$R'(p) = f(p) + pf'(p)\\\\R'(20) = f(20) + 20(f'(20))\\\\R'(20) = 13000 + 20(-550) = 2000$

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