What is the slope intercept form

The graph below shows the height of a projectile t seconds after it is launched. if acceleration due to gravity is -16 ft/s2, which equation models the height of the projectile correctly?

When 142 is added to a number the result is 64 more times the number my options are 35 37 39 41

How much would it be worth in 5, 10, 20 years