Answer:
40
Step-by-step explanation:
A x B = 10 x 4 = 40
ab=40
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7x + 12 = 47
7x = 35
x = 5
C-1/64
(1/4)(1/4)(1/4)=1/64
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x = 5.6
5x - 7 = 21
5x = 28
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