I am really having a hard time working this problem out. Any help would be great

Question

I am really having a hard time working this problem out. Any help would be great.. thank you..   
The projectile is fired at an angle of 30 degrees to the horizon with an initial speed of 150 meters per second. Find Range and Maximum height. Round to two decimal places. I am really having a hard time working this problem out. Any help would be great.. thank you..   
The projectile is fired at an angle of 30 degrees to the horizon with an initial speed of 150 meters per second. Find Range and Maximum height. Round to two decimal places.

Explanation / Answer

y-direction = 150sin(30) = 75 Useful Equations: 75 - 9.8T = 0 - Flight Time up T    2T - Flight Time up and down t 150cos(30) * (t) - Range 150sin(30)T - 4.9T2 = - Max. Height Flight time UP = 75/9.8 = 7.653... seconds Flight time TOTAL = 2 * (75/9.8) = 15.306... seconds Range = 150cos(30) * (150/9.8) = 1988.32 meters Max Height = 150sin(30) * (75/9.8) - 4.9 * (75/9.8)2 = 286.99 meters

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