Answer:
D
Step-by-step explanation:
If the arrow is in the air, then when it hits the ground, h(t)=0. So:
0=-16t²+63t+4
16t²-63t-4=0
(16t+1)(t-4)=0
t= -1/16 or 4
Using the positive result of 4, we get t=4 seconds as the time the arrow was in the air
☺☺☺☺
Answer:
u^2+4u-12
Step-by-step explanation:
u x u + 6u -2u - 2 x 6
Last one u can use a cac lol