Answer:
The answer is C.
Step-by-step explanation:
Given formula h(t)=−16t2+v0t+h0 , where v0 is the initial velocity and h0 is the initial height.
In this case, the initial postion is a platform 30ft above ground so h0=+30
The initial velocity is 38 ft/s straight up into the air so v0=+38
h(t)=-16t2+38t+30
When the object hits the ground, h=0.
h=-16t2+38t+30=0
Simplifying 8t2-19t-15=0
(8t+5)(t-3)=0
t=-5/8 or 3
As time cannot be -ve, t=3s. The answer is C.
Answer:
Step-by-step explanation:
2.
y=kx
8=-4k
k=-2
so y=-2x
3.

4.
eq. of line is y-5=4(x+2)
Answer:
-5y + 8x
Step-by-step explanation:

Answer:
12
Step-by-step explanation:
(5x+5)+(115)=180
180-120=60
60/5=12