AlgebraHardStarting fee from two totals
Algebra practice question
A courier's charge is a linear function of distance. A 4-kilometre delivery costs $14 and an 8-kilometre delivery costs $26. What is the charge, in dollars, for a delivery of 0 kilometres, that is, the fixed fee?
Answer: 2
The rate is 12/4 = 3 dollars per km, so the fixed fee is 14 − 12 = 2.
Common wrong answers
- If you answered 3
- 3 is the rate per kilometre.
- If you answered 14
- 14 is the 4-kilometre charge.
- If you answered 3.5
- 3.5 divides 14 by 4.
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