Question

Which expression is equivalent to 3^4 x 3^-9?

Answer 1

1/3^5

When multiplying exponents you just add them. X^a x X^b = X^a+b

If you have a negative exponent, you flip it to be the denominator (if originally numerator) or numerator (if originally denominator.

So, 3^-5 = 1/3^5