Advanced MathVery hardTotal growth over four doublings
Advanced Math practice question
The value of a collectible is modelled by V(t) = 5 · 2ᵗ hundred dollars, where t is the number of years since purchase. By how many hundred dollars does the value increase over the first 4 years?
Answer: 75
V(4) − V(0) = 80 − 5 = 75.
Common wrong answers
- If you answered 20
- 20 uses linear growth of 5 per year.
- If you answered 40
- 40 is V(3).
- If you answered 80
- 80 is V(4) itself.
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