Help, physics Im supposed to throw a ball in the air And Calculate the destince with Only a?

The equation for all thrown objects is s = (1/2)at^2. That equation calculates the height s as a function of time. If you want the range then you have to calculate vertical and horizontal velocities according to the angle and muzzle velocity, get the time for the vertical travel, and use that to calculate the horizontal range. You need to understand this process perfectly.