Question 1:

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This one should be simple, I already have the answers to a, b and c. But for some reason I can't seem to remember how to calculate d. That is if the motion of an object (in this case a ball) can be modeled by a parabola, then what was the initial angle the ball was fired at (in radians)? Any pointers on this one would be vastly appreciated.

Question 2:

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This is how I worked through the problem:

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But obviously my answer is incorrect, so if anyone could help explain where in my steps to solve the question I went wrong, that would be fantastic.

Question 3:

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This question is flooring me at the moment, I have no clue where to start or even what the notation in the second line of the question is referring to. If someone could set me on the path to solving for a, b and c I would be most thankful