Simplify each expression. only use positive exponents.
1) 5m^5 m^-8
2.) (4.5)^4(4.5)^-2
3.) (x^2 n^4) (n^-8)

1)  5/m^3

2)  (4.5)^2

3) x^2/n^4

Step-by-step explanation:

1) 5m^5 m^-8  = 5m^(5 +(-8)) = 5m^-3 = 5/m^3

2.) (4.5)^4(4.5)^-2  = (4.5)^(4 + (-2)) = (4.5)^2

3.) (x^2 n^4) (n^-8)  = x^2 n^(4 - 8) = x^2n^-4 = x^2/n^4

y/x=18

step-by-step explanation: