AlgebraEasy–MediumValue of a linear function from a rate and a start
Algebra practice question
A snow depth gauge read 3 centimetres at midnight, and snow fell steadily at 0.5 centimetres per hour. What did the gauge read, in centimetres, at 4 p.m. the same day?
Answer: 11
Midnight to 4 p.m. is 16 hours: 3 + 0.5 × 16 = 11.
Common wrong answers
- If you answered 5
- 5 uses 4 hours (reading '4 p.m.' as 4 hours after midnight).
- If you answered 8
- 8 is 0.5 × 16, the snowfall alone, without the starting 3 cm.
- If you answered 19
- 19 uses 0.5 × 32, doubling the hours.
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