Question

Each day that a library book is kept past its due date, a $0.30 fee is charged at midnight. Which ordered pair is a viable solution if x represents the number of days that a library book is late and y represents the total fee?

(–3, –0.90)
(–2.5, –0.75)
(4.5, 1.20)
(8, 2.40)

Answer 1

The fee is y = 0.30x with x ≥ 0. Check the options:
- (-3, -0.90) and (-2.5, -0.75): x is negative (not possible).
- (4.5, 1.20): 0.30×4.5 = 1.35, not 1.20.
- (8, 2.40): 0.30×8 = 2.40 and x ≥ 0.

So (8, 2.40) is the viable solution.