contestada

Samantha threw an apple out of a window from the tenth floor of her apartment building.the equation y=-16t^2+120 can be used to represents the fruits height above the ground, where t represents time, in seconds, after she threw the apple. how long did it take the apple to hit the ground?Round your answer to the nearest hundredth

Respuesta :

sarah11703
0=16t^2+120
divided by 8
0=2t^2+15
do the quadratic formula
t=0+ or - square root of 0-4(2)(15) all over 4
t=0+ or - square root of -120 all over 4
t=0+ or - 2i square roots of 30 all over 4
reduce down
t=+ or - i square roots of 30 all over 2
only the positives work because of time
so t=+i square roots of 30 all over 2

Otras preguntas