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7 December, 16:22

Dan uses a remote control to make his drone take off from the ground. Function h represents the height, in feet, of the drone t seconds after it begins flying.

Which statement correctly describes this situation?

A.

The drone is on the ground at 0 and 16 seconds.

B.

The drone is on the ground at 0 and 4 seconds.

C.

The drone is on the ground at 2 and 4 seconds.

D.

The drone is on the ground at 0 and 2 seconds.

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Answers (2)
  1. 7 December, 17:49
    0
    I think it's c I am not sure
  2. 7 December, 19:36
    0
    Answer: C. The drone is on the ground at 0 and 4 seconds.

    Step-by-step explanation:

    Here the function that shows the height of the drone,

    h (t) = - 16 (t-2) ^2+64

    Where t is the time in seconds.

    Since, the drone is ground when, h (t) = 0

    -16 (t-2) ^2+64=0

    -16 (t-2) ^2 = - 64 (by subtracting 64 from both sides 64)

    (t-2) ^2 = 4 (dividing both sides by - 16)

    t^2-4t+4 = 4

    t^2-4t = 0 (by subtracting 4 from both sides)

    t (t-4) = 0

    ⇒ t = 0 or t = 4

    Thus, Option C is correct.
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