Question 325766
Use the same rules that apply to regular multiplication of fractions. You must also use the rules for division of exponents. 

(5y^6/3v^4) * (9v^6/25y) = 
 
25/5 = 5

y^6/y = y^5

9/3 = 3

v^6/v^4 = v^2

The left side fraction becomes (y^5/1) and the right side fraction becomes
(3v^2/5).

We now multiply numerator with numerator and denominator with denominator.

(y^5/1) * (3v^2/5) = (3v^2y^5)/5

Did you follow?