PLEASE HElp with math ... please and thank you

y = -1/5x + 2

Step-by-step explanation:

y = mx + b

m (slope) = -1/5

b (y-intercept) = 2

y = -1/5x + 2

To convert miles per hour to meters per second divide by 2.237

128 miles per hour / 2.237 = 57.22 meters per second.

Using the first equation:

57.22 = sqrt(2 x 9.81 x h)

Remove the sqrt by raising both sides to the second power:

57.22^2 = (2 x 9.81 x h)

Simplify Both sides:

3274.1284 = 19.62h

Divide both sides by 19.62:

H = 3274.1284/ 19.62

H = 166.88 meters