Characterize Exponential Functions

Identify the y-intercept (initial value) of the function f(x)=2(4)^x.

• 2

• 4

• (2)^x

• 8

Suppose the population of a species of insects doubles every year. There are 1600 insects initially. The function for the scenario would be?

Which function models this table?

Is the pictured graph increasing, decreasing, or neither?

• Increasing

• Decreasing

• Neither

Identify the common ratio (multiplier) of the function f(x)=2(4)^x.

• 2

• 4

• (2)^x

• 8

This is an exponential function.

• True

• False

What is the y-intercept of the function?

• 2

• 3

• 1

• -2

This is an exponential function.

• True

• False

Which equation is represented by the table?

• y = 40(2)^x

• y = 40(1/2)^x

• y = 40 - 2x

• y = 40 - 1/2x

What type of pattern do exponential functions have?

• Adds or subtracts by the same number every time

• Multiplies or divides by the same number every time

• Square roots all the inputs