AlgebraMediumStarting fee from two readings
Algebra practice question
A courier's total charge is a linear function of the number of parcels. Three parcels cost $22 and seven parcels cost $34. What is the fixed part of the charge, in dollars, before any parcels are counted?
Answer: 13
The rate is 12/4 = 3 per parcel, so the fixed part is 22 − 9 = 13.
Common wrong answers
- If you answered 3
- 3 is the rate per parcel.
- If you answered 22
- 22 is the three-parcel charge.
- If you answered 7.33
- 7.33 divides 22 by 3.
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