Problema Solution
On her last three tests, Elise scored 84, 96, and 88. What grade must she get on her next quiz to have an average of 90 on all four quizzes?
Answer provided by our tutors
let x = the grade that Elise must get on her next quiz to have an average of 90 on all quizzes
(84 + 96 + 88 + x)/4 = 90
by solving the equations we find
x = 92
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t Elise must score 92 on her next quiz to have an average of 90 on all quizzes.