Simplify the given expression. Write your answer with positive exponents. (x−4y3)−5

This is the same as writing (x^20)/(y^15)

===================================================

Work Shown:

In the second step, I used the rule that (a*b)^c = (a^c)*(b^c)

In step 3, I used the rule (a^b)^c = a^(b*c)

In the last step, I used the rule a^(-b) = 1/(a^b)

f(x) = y

f(-3) = -5

step-by-step explanation:

the correct answer is 5 6 and 7