Answer:
Hope this helps!^^
Explanation:
1. 4^5/4^2
Apply exponent rule x^a/x^b=x^a-b
4^5-2
64
2. 8^-2
apply exponent rule a^-b =1/a^b
1/8^2
1/64
3. 19a(2y)^3(y)^0 y=3 a=2
First, lets complete the inside parenthesis
2*3=6
so
19a(6)^3(3)^0
19*2(6)^3(3)^0
8208