Question

A boy drops a coin off a 64-foot cliff. If the equation of the height, h, of the coin t seconds after it drops is h = -16t2 + 64, about how many seconds will the coin take to reach the bottom of the cliff?


1 second


1.5 seconds


2 seconds


2.5 seconds

Answer 1

To be frank I dont think the equation is quite right.

Answer 2

lol that wouldnt be a first.... book is riddled with errors.

Answer 3

Why am I not surprised :D

Answer 4

Any ida how this is suppose to go?

Answer 5

If you substitute h=64, you get t=0. Thats baseless coz the coin would be on the ground the whole time. Well try other problems.

Answer 6

Solve the equation by graphing. x2 - 18x + 81 = 0


{-2, 9}


{9/2, 3}


{9}


no real solution

What about this one?

Answer 7

9 is the ans

Answer 8

Solve the equation by graphing. x2 + 5x + 8 = 0


{-5, 8}


{2, 4}


{-4, 5}


no real solution

Answer 9

Nope no solution

Answer 10

Solve the equation by graphing. 3x2 + 9x = 12


{-4, 1}


{-6, 2}


{-3, 4}


no real solution

Answer 11

{-4,1}

Answer 12

Solve the equation by graphing. x2 - 5x - 24 = 0


{4, 6}


{-2, 12}


{-4, 6}


{-3, 8}

Answer 13

{-3,8}

Answer 14

Estimate the roots of the equation by graphing. Round to the nearest tenth and write in set form, such as {-1.2,3.4}.

x2 - 6= 0