A ball is dropped from the top of a building that is 250 feet tall. The height h of the ball in feet after t seconds is modeled by the function h =
- 16t2 + 250. How long will it take for the ball to reach a height of 75
feet? Round to the nearest tenth.

hi

-16t²+250 = 75

-16t² = 75 -250

-16t² = -175

  t² = -175 /-16

 t² = 175/16

Here there si two solutions :  t =   and  t =  -

However, as time cannot rewind,  we will  keep only positive solution

So t =

     t≈ 5.47  

in seconds  it will be  :  5.28 seconds

answer for #1 is c

answer for #2 is d

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