exam Maths Puzzle Numerical Ability

find any rational roots for the equation: x^4 + 3x^2 - 8x + 10 =0

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exam Other Question

There is a pool of water. One Pipe empties the pool in 45 minutes. The other pipe empties it in 67.5 minutes. How long would it take to empty the pool if both pipes were used together?

This is from a worksheet my son brought home. Willis scores an average of 7 foul shots out of every 10 attempts. At the same rate how many shots would he score in 200 attempts?