Answer: 
Step-by-step explanation:
Given
The area of the square is 
Suppose a is the side length of the square
The area of the square is given by

So, we can write

length of each side is 
The answer would be 79.64
I circled the formula for the area of a sector.
Answer:
p = 2.7x - 20
p(90) = $223
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”
<u><em>means</em></u>

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<u><em>means</em></u>

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………………………………
the profit for 90 downloads :
= p(90)
= 2.7×(90) - 20
= $223
Answer:
John answered 50 questions.
Step-by-step explanation:
Although five of John's answers were incorrect, 90% of his answers were correct.
This means that 5 is 100 - 90% = 10% of the total number of questions, n. So



John answered 50 questions.
2/5 ≥ x - (4/5). add 4/5 to each side
6/5 ≥ x