Ok I just need someone to explain. Evaluate 12.1p + 11.9r when p=6 & r=7
12.1(_) + 11.9(_) = __+ 83.3 =__
I Put
12.1(6) + 11.9(7) = 71.2 = 83.3 = 155.9
It said that 71.2 was wrong and said the correct one was 72.6
Can someone explain how to do this please and thank you

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Solve for x and select the correct answer