Advanced MathHardHeight at launch from a vertex-form model
Advanced Math practice question
The height h, in feet, of a firework t seconds after launch is modelled by h(t) = −(t − 4)² + 25 until it bursts at its highest point. From what height, in feet, was it launched?
Answer: 9
At t = 0, h = −16 + 25 = 9.
Common wrong answers
- If you answered 4
- 4 is the time of the burst.
- If you answered 16
- 16 is (0 − 4)² without the 25.
- If you answered 25
- 25 is the height at the burst.
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