You get scores of 85 and 91 on two history tests. Write and solve an inequality to find the scores you can get on your next history test to have an average of at least 90.
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Let x be the score on the next test then (85+91+x)/3≥90.

Multiply each side by 3: 85+91+x≥270.

So 176+x≥270 and x≥270-176, x≥94. The score on the next test must be at least 94.

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