Step-by-step explanation:
12x - 16 = 2x - 21
10x - 16 = -21
10x = -5
x= -0.5
Answer:
x=1
Step-by-step explanation:
You just have to go through it thoroughly. You are probably making a small mistake somewhere.
Answer:

Step-by-step explanation:
u = Initial velocity of baseball
= Angle of hit = 
x = Displacement in x direction = 400 ft
y = Displacement in y direction = 15 ft
= Height of hit = 2.5 ft
= g = Acceleration due to gravity = 
t = Time taken
Displacement in x direction

Displacement in y direction

The minimum initial velocity needed for the ball to clear the fence is 
To work out the percent increase, we can use the following equation:
24 / 10 = 2.4
2.4 x 100 = 240%
Hope I helped!