Calculating displacement, distance traveled, and max height

sugar1
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Hi I need help solving this problem. Thank you.

1. Homework Statement [/b]

Given:
assume g = 9.81 m/s2, and friction can be ignored.

A ball is thrown into the air at speed 43 m/s, at an angle of 53.7 o to the ground. The ball lands at the same elevation as it was thrown.

a) Find the time it took to hit the ground in seconds

b) Find the horizontal distance the ball traveled in meters

c) find the maximum height the ball reached in meters
 
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There are two things I don't understand about this problem. First, when finding the nth root of a number, there should in theory be n solutions. However, the formula produces n+1 roots. Here is how. The first root is simply ##\left(r\right)^{\left(\frac{1}{n}\right)}##. Then you multiply this first root by n additional expressions given by the formula, as you go through k=0,1,...n-1. So you end up with n+1 roots, which cannot be correct. Let me illustrate what I mean. For this...
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