A scientist dropped an object from height of 320 feet. The height of the object is modeled by the equation h=320 - 16t^2 . After how much time will the object hit the ground? v/20 seconds

10 seconds

40 seconds

20 seconds

√20

Step-by-step explanation:

hit the ground means h = 0

0 = 320 - 16t²

16t² = 320

t² = 320/16 = 20

t = √20

set each factor equal to 0

4x-3 = 0

2x-1 = 0

solve for x.

4x-3=0

4x=3

x= 3/4

solve for x. 

2x-1= 0

2x= 1

x= 1/2

eventually after a few more steps, your answer should be 1/2 is less than or equal to x and 3/4 is greater than or equal to x

according to the triangle sum theorem, all the angles in a triangle must add up to 180 degrees. if we know one angle is already 90, we do 180-90=90. the other 2 angles must add up to 90, exactly.

step-by-step explanation: