1.)(-2m^3)(3.5m^-3)
2.)(x^5y^2)(x^-6y)
Is x^-6y supposed to be x^-6 * y ?
Use the rule that when you multiply x^n by x^b, the product is x^(a+b). x can be any number, such as m or y.
The product of your m^3 and m^-3 terms in the frst question is m^0, which is 1. You do the rest.