Answer:
D. 5(z/x)^10
Step-by-step explanation:
15/3 = 5
z^-5 gets moved to the top, and made positive z^5
x^-3 gets moved to the bottom, and made positive x^3
z^5 + z^5 = z^10
x^7 + x^3 = x^10
5(z/x)^10
