An object is dropped from the top of a tall building. The height S of the object after t seconds I’d given by the equation S = -16t^2+324. Find how many seconds pass before the object hits the ground.

Step-by-step explanation:

   0 = -16t² + 324

16t² = 324

  t²  = 20.25

    t = 4.5 s

step-by-step explanation: h: (- 3, 6)

m: (1, - 2)

o: (7, 6)

r: (- 9, - 2)

midpoint of hm: (- 1, 2)

midpoint of or: (- 1, 2)

therefore, b is the midpoint of both diagonals bisect each other !

to prove the diagonals are perpendicular, show that the product of the slopes = - 1

i dont know sorry

step-by-step explanation: