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Product = multiply.
The two numbers you are looking for are -15 and 4. When you multiply -15 and 4, you get -60, and when you add them together, you get -13.
to multiply by 10 just add a zero
3,3,1,1,1,1,1,1,1,1.
no 3 numbers add to equal 10 and multiply to equal 40.