SOLUTION: A student scored 71, 83, and 96 on threee algebra test. what must he score on the forth test in order to have an average grade of at least 85?

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Hi,

Let x represent the score on the forth test

(71 + 83 + 96 + x)/4 ≥ 85

(71 + 83 + 96 + x) ≥ 340

250 + x ≥ 340

x ≥ 90

he must score a least a 90 on his fourth test