3 years ago

What is the solution to this system of equations? a+b=9 a-b=3

Mathematics

1 answer:

ladessa [460]3 years ago

8 0

Answer:

A. (6,3)

Step-by-step explanation:

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Answer:

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Step-by-step explanation:

revenue → f(x) = 3x ,where x is the number of downloads.

the statement “Your profit p is $20 less than 90% of the revenue for x downloads”

means

$p=90\% f\left( x\right) -20$

means

$p=\frac{90}{100} \times f\left( x\right) -20$

means

$p=\frac{9}{10} \times (3x) -20$

means

$p=\frac{9}{10} \times (3x) -20$

means

$p=2.7x -20$

………………………………

the profit for 90 downloads :

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