Answered

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Brett earned scores of 74, 90, and 84 on his first three quizzes this term. What score
does he need on his next test to raise his average to 85?

Sagot :

Clarch19idn

Answer:

x ≥ 92

Step-by-step explanation:

let 'x' = necessary score

(74 + 90 + 84 + x) / 4 ≥ 85

(248 + x) / 4 ≥ 85

cross-multiply:

248 + x ≥ 340

x ≥ 92

Answer:

92

Step-by-step explanation:

(74 + 90 + 84 + 92) / 4 = 85

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