Question

Rewrite the expression using positive exponents:
1.) y^-3 2.) x^-5 3.) 3x^4

Answer 1

Negative exponents work like this: you have to consider the multiplicative inverse of the positive exponent.

So you have

$y={-3} = \dfrac{1}{y^3},\quad x^{-5} = \dfrac{1}{x^5}$

The third expression already contains positive exponents only, you don't have to do anything.