nicole charges a flat fee of $3 to babysit, as well as $4 per hour. She earned $15 on Friday night. How many hours did she work?

3 hours

Step-by-step explanation:

Number of hours worked = x

Write an equation

$3 + 4x = $15

Subtract $3 from both sides

4x = $12

Divide both sides by 4

x = 3

Hope this was useful to you!

Answer: 3 hours

Step-by-step explanation: Subtract the flat fee first. 15-3=12. She earned $12 without the flat fee, so divide that by 4. $12/$4 per hour = 3 hours.