Suppose you make $5 an hour as a dog walker. Let h represent the number of hours you work in a week. Write an expression that represents the amount of money you earn in a week and evaluate it for h = 20.
To write an expression that represents the amount of money you earn in a week based on the hourly rate and the number of hours you work (represented by h), you simply multiply the hourly rate by the number of hours:
Earnings = Hourly Rate * Number of Hours Worked
Earnings = $5 * h
So the expression for your weekly earnings as a dog walker is:
Earnings = 5h
To evaluate this for h = 20 hours:
Earnings = 5 * 20
Earnings = $100
So, if you work 20 hours in a week at a rate of $5 an hour as a dog walker, you would earn $100 that week.