9.1 Notes Intro - Exponential Functions

What is 5/8 written as a percent?

• 75%
• 50%
• 80%
• 62.5%

Answer explanation

To change a fraction into a percent:

First, turn the fraction into decimal form.

Then, multiply the decimal by 100.

Does the second graph show exponential growth or decay?

• Exponential Growth

• Exponential Decay

What is the y-intercept shown on the second graph?

What is the horizontal asymptote for the second graph?

Answer explanation

We can see where they horizontal asymptote is by looking for where the function starts to "flatten" out.

What is the domain and range of the second graph?

• Domain: All Real Numbers

  Range: y > -4

• Domain: x > -4

  Range: All Real Numbers

• Domain: x > -2

  Range: y > -4

• Domain: x > -2

  Range: All Real Numbers

Answer explanation

Unless there are clear endpoints marked (dots at each end), the domain should always be all real numbers for an exponential function.

The range will use the number from the horizontal asymptote. If the function is above the horizontal asymptote, the range is y > #, and if it is below, the range will be y < #.