Write your answer with only positive exponents. y^5y^10

Answer 1

I guess you meant to type:

y^-5 times y^-10.

Well, y^-5 becomes 1/y^5.

Also, y^-10 becomes 1/y^10.

We now have this:

(1/y^5) times (1/y^10) = 1/y^15