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

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

To simplify the expression y^5 * y^10, we can use the rule of exponents that says when multiplying the same base, you add the exponents. Here's how you can solve it step by step:

1. Start with the expression y^5 * y^10.
2. According to the rule of exponents, add the exponents together: 5 + 10 = 15.
3. Rewrite the expression using the new exponent: y^15.

Therefore, the simplified expression is y^15.