Answer:
Ok
Step-by-step explanation:
He lifts for 11 more minuets each day.
51 + 11 = 62
He lifted for 62 minuets on Friday.
62 + 11 = 73
He lifted for 73 minuets on Saturday.
x = (d + b) / (2a - c)
2ax-b = cx+d
2ax - cx = d + b
x (2a-c) = d + b
the answer is x=-1/3
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