Ms. donahue uses 4 essays as the basis for her grading. each essay counts as a percent of the final average.
essay 1 10%
essay 2 15%
essay 3 25%
essay 4 50%
joel had the following scores for his work: essay 1, 85; essay 2, 90; essay 3, 80; and, essay 4, 100.
what is joel's expected final average?
a) 86
b) 89
c) 90
d) 92

This is NOT the case of adding up the sums of scores and dividing by 4.

This is a weighted average where we take each score and multiply by its weight (% worth) and then do the sum. We finally divide by sum of percentage (10%+15%+25%+50%=100%=1).

So, weighted average =

Joel's expected final average is D (92).

ANSWER: D

-7

step-by-step explanation:

x^2 + 18x + 74 = (x + 9)^2 - 81 + 74

= (x + 9)^2 - 7.

so q = -7.