ERGENT PLS HELP Harvey is solving an equation. His work is shown below.
50 + (50 + 9) = 57
(5x + 50) + 9 = 57
100 + 9 = 57
Which statement describes the procedure Harvey used in his work and which property justifies the procedure?
O A.
Harvey regrouped the terms to add 5x and 5x and 9. This procedure is justified by the commutative property.
O B.
Harvey regrouped the terms to multiply 5x and 5x by 9. This procedure is justified by the associative property.
O C.
Harvey regrouped the terms to add 5x and 5x. This procedure is justified by the associative property.
Harvey regrouped the terms to multiply 5x and 5x. This procedure is justified by the commutative property.
OD
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