Exercise 16 Page 457

Using the function y, we want to evaluate for the given value, x=3. To do this, we need to substitute 3 for x.

y=20 * 0.5^x

Substitute

x= 3

y=20 * 0.5^3

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Evaluate right-hand side

WriteAsFrac

Write as a fraction

y=20 * (1/2)^3

PowQuot

(a/b)^m=a^m/b^m

y=20 * 1^3/2^3

CalcPow

Calculate power

y=20 * 1/8

MoveLeftFacToNumOne

a* 1/b= a/b

y=20/8

CalcQuot

Calculate quotient

y=2.5