bn,mn,n.vn.

step-by-step explanation:

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Remark

You set this up as (75 + 81 + 77 + 83 + x)/5 = 80 Combine the left

(316 + x)/5 = 80 Multiply by 5

316 + x = 80 * 5

316 + x = 400 Subtract 316

316 - 316 + x = 400 - 316

x = 84 <<<< Answer

She should get 84 in her fifth test to have an average of 80

(75 + 81 + 77 + 83 + x)/5 = 80

(316 + x)/5 = 80

[(316 + x)/5] (5) = 80(5)

316 - 316 + x = 400

316 + x = 400 - 316

x = 84

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