Hi, Selina.
I believe you are looking for the product of the sum of 64 and 17, and the difference of 56 and 39.
So the sum of two numbers is the total of them (addition):
64 + 17 = 81
The difference is the answer to a subtraction problem so the difference of 56 and 39 is:
56 - 39 = 17
Now, the product is the answer to a multiplication problem.So you would then need to multiply
81 and 17.
81 x 17 = 1377
Selina S.
Thank you very much01/19/19