If someone throws a ball down from a height of 100 meters, the ball's distance from the ground can be modeled by the equation: d = − 9.8 t 2 − 15 t + 100 where t is the time in seconds and d is the distance in meters.

Question;

At what time (t) will the ball hit the ground?

The answer to the question is;

The ball will hit the ground at t = 2.52 s

Step-by-step explanation:

To answer the question we note the formula for distance from the gound is given by

d = − 9.8·t² − 15·t + 100

To find out the time when the ball hits the ground we have

The ball hits the ground at d = 0, therefore we have

0 = − 9.8·t² − 15·t + 100, solving by factorization gives

(t-2.52)(t+4.05)×(-9.8) = 0

Therefore the ball hits the ground at either 2.52 s or -4.05 s (imaginary)

Which gives t = 2.52 s.

stethere all not eveanp-by-step explanation:

there are 70 more legs than eyes at the dog show (196 – 126 = 70). dogs have two more legs than eyes, and humans have the same number of legs as eyes. thus 70 is twice the number of dogs at the show, so the number of dogs is half of 70, which is 35. to get the number of humans, subtract 35 from 63: 63 – 35 = 28.

step-by-step explanation: