F(x) = x^2 - 8x + 5
f(-1) = -1^2 - 8(-1) + 5
f(-1) = 1 + 8 + 5
f(-1) = 14 <==
800 is 10% of 8,000. So half of 800 is 400. That makes the percent of her sale that is Avery's commision is 5%.
The value of 2 in 2,783 is thousand. The value of 2 in 7,283, is hundred.
So it is one times the value.
225 miles / 45 miles/hr = 5hr
