Sue has taken four exams so far in her History course. Her scores are 84.0, 78.2, 93, and 87.5. What is the average of these sco
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-px + r = - 8x - 2
-px + r + 8x +2 = 0
-px +8x = -r -2
x(8-p) = -r -2
x= =