Question

18. A student scored 78 and 95 on his first two quizzes. Use a compound inequality to find the possible values for a third quiz score that would give him an average between 80 and 90, inclusive. (1 point)67 ≤ x ≤ 9778 ≤ x ≤ 9580 ≤ x ≤ 9086 ≤ x ≤ 87

Answer 1

WEll, let the third score be x... so avg= (78+95+x)/3 .

Answer 2

Now equate this average to 80, to get the lower bound of x, and 90 to get the higer bound of x.

Answer 3

67<x<97