Mathematics, 30.09.2019 21:40 julissav28346

On his first two social studies tests, billy made an 86 and a 93. what grade must billy make on the third test to have an average of 90 for all three tests? a. 91 c. 85 b. 87 d. 90

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On his first two social studies tests, billy made an 86 and a 93. what grade must billy make on the...