Answer:
5 half-hour intervals.
Step-by-step explanation:
Let's break down the information given:
- Keisha's parents pay her $2.50 for each half hour she works in the yard.
- Keisha also receives a $1 tip.
- Keisha made a total of $13.50.
To find out how many hours Keisha worked, we can set up an equation. Let's denote the number of half hours she worked as "x":
Total earnings = Payment per half hour * Number of half hours worked + Tip
$13.50 = ($2.50 * x) + $1
Now, let's solve this equation to find the value of "x" (the number of half hours worked):
$13.50 - $1 = $2.50 * x
$12.50 = $2.50 * x
x = $12.50 / $2.50
x = 5
Therefore, Keisha worked for 5 half-hour intervals, which is equivalent to 2.5 hours.
