Exercise 40 Page 422

To evaluate the given expression for r = -3 and s = 5, we should substitute these values into the expression and simplify as much as possible.

s^0/r^(-2)

SubstituteII

r= -3, s= 5

5^0/( -3)^(-2)

ExponentZero

a^0=1

1/(-3)^(-2)

NegExponentToFrac

a^(- m)=1/a^m

1/1/(-3)^2

DivByFracD

a/b/c= a * c/b

1*(-3)^2/1

DivByOne

a/1=a

1 * (-3)^2

IdPropMult

Identity Property of Multiplication

(-3)^2

CalcPow

Calculate power

9