Advanced MathEasyEvaluating a quadratic model
Advanced Math practice question
The height, in metres, of a drone t seconds after it is launched is modelled by h(t) = 4t − t². What is the drone's height, in metres, 3 seconds after launch?
Answer: 3
h(3) = 4(3) − 3² = 12 − 9 = 3.
Common wrong answers
- If you answered 6
- 6 is 4(3) − 3 × 2 or a similar slip; t² is 9.
- If you answered 9
- 9 is 3² alone; the 4t term contributes 12.
- If you answered 21
- 21 is 12 + 9, adding t² instead of subtracting it.
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For x > 0, which of the following is equivalent to ∛(x⁵) ? - Easy
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