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OP warned about not using the homework template

A ball is shot from the ground into the air. At a height of 9.1 m, its velocity vector (in unit vector notation) is (7.6i - 4.9

What was the maximum height of of the ball above the ground?

I swear to god i have been working on this for 2 hours and got nowhere! >=[. i tried

-4.9 = -9.8(t)+vy0 and solved for t. i then plugged t into the position formula and got some crazy answer that makes no sense! Please give me a better understanding of this problem!!

*j*) m/s; that is, vx = 7.6 m/s and vy = -4.9 m/s.What was the maximum height of of the ball above the ground?

I swear to god i have been working on this for 2 hours and got nowhere! >=[. i tried

-4.9 = -9.8(t)+vy0 and solved for t. i then plugged t into the position formula and got some crazy answer that makes no sense! Please give me a better understanding of this problem!!