Answer:
392.
Explanation:
7m + 3mn Substitute the variables.
7(8) + 3(8)(14) Multiply from left to right.
56 + 24*14 Multiply 24 by 14.
56 + 336 Add the products.
392 is the answer.
392
7(8) + 3(8)(14)
56 + 24(14)
56 + 336
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