Answer:
1. 15t + 30 ≥ 90
2. t ≥ 4
3. 4, 4.5, 5
Step-by-step explanation:
1.
She starts by charging a fixed fee of $30.
cost = ... + 30
She charges $15 per hour. For t hours, she charges 15t.
total charge = 15t + 30
She needs to make at least $90. That means the amount she makes has to be equal to or greater than $90.
15t + 30 ≥ 90
2.
15t + 30 ≥ 90
15t ≥ 60
t ≥ 4
She needs to work at least 4 hours.
3.
All values that are 4 or greater work: 4, 4.5, 5
