Question

Asked Oct 1, 2019

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Which of the following exponential functions represent growth and which represent decay?

**a. ** y=92⋅4x represents exponential

**b. f(t)=61⋅(25)t **represents exponential

**c. **w(r)=220⋅0.92r represents exponential

**d. ** g(r)=2⋅106⋅1.18r represents exponential

**e. ** y=7⋅109⋅0.6z represents exponential

**f. h(x)=130⋅(32)x **represents exponential

Step 1

The exponential function f(x)=a(b)^x represents

a) growth if a>0 and b>1

b) decay if a>0 and 1<b<1

Step 2

We compare the given function by f(x)=a(b)^x and find a and b

In case A, B,D and F , a>0 and b>1, so the functions represent growth

Step 3

In case C and E , a>0 and 0<b<1, so the functions represent decay

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