Identify each function as linear or exponential.

1) \(f(x)=3x\)

2) \(f(x)= \left( \Large \frac{2}{3} \right) ^x\)

3) \(f(x)=-4^x\)

4) \(f(x)=7(2)^x\)

5) \(f(x)=7(0.5)x\)

Key:

1) Linear

2) Exponential, decay \(0<\Large \frac{2}{3}\normalsize<1\)

3) Exponential, growth \(4>1\)

4) Exponential, growth \(2>1\)

5) Linear

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