A ball dropped from the roof of a 120 foot high building took 4 seconds to reach the ground. What was the average speed of the ball during its fall? A
480 feet per second
B
124 feet per second
C
30 feet per second
D
130 feet per second

answer is C

average speed=distance÷time=120÷4=30

the first one is x^2+2x+2

the second one is x^2+4

the last one is x^2-4x+8

the solution is x=1

step-by-step explanation:

we are given our   equation as

let's assume

left side function is

right side function is

now, we can draw graph

and then we can get intersection point

the intersection point will be solution

so, the solution is

x=1