Hannah's electricity company charges her a flat rate and then a certain amount per kilowatt hour. Use the table to help you answer the following questions.

Hannah's Electric Bill

Kilowatt hrs 20 25 30 35 40 45 50
Electric bill

$17.20 $17.75 $18.30 $18.85 $19.40 $19.95 $20.50
1. This data can be modeled with a
exponential
regression equation.

2. Choose the appropriate regression equation.
y=15.34(1.01)^x

3. If Hannah's bill is $21.60, how many kilowatt hours did she use?

4. If Hannah uses 73 KwH, how much will her bill be?

5. If her bill is $67.80, how many kilowatt hours did she use?