AlgebraEasy–MediumEvaluating a linear cost model
Algebra practice question
A van rental costs $55 per day plus $0.20 per mile. What is the cost, in dollars, of renting the van for one day and driving 150 miles?
Answer: 85
Cost = 55 + 0.20(150) = 55 + 30 = 85.
Common wrong answers
- If you answered 30
- 30 is the mileage charge alone.
- If you answered 205
- 205 comes from 55 + 150, ignoring the per-mile rate.
- If you answered 355
- 355 comes from 55 + 2 × 150, misplacing the decimal in $0.20.
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