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Which choice shows (8· 4)· 2 0 correctly rewritten using the associative property and then correctly simplified?
a. 4· (8· 20)=4· 160=640 b. (84)· 20=1680 c. 8· (4· 20)=32· 20=640 d. 8· (4· 20)=8· 80=640
Sagot :
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