exam Maths Puzzle Numerical Ability

In a 10 foot wide alley, two ladders lean against opposite walls. One Ladder reaches 30 feet up on the wall, while the other reaches 20 ffet up on the opposite wall. How high above the ground will the two ladders cross?

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I have been helping my son with his homework and I myself need help w/ this problem.

Points X,Y, and Z are collinear, w/ point X between points Y and Z. If XY = 14.8 and YZ = 18.2, find XZ.

Thank you for the help.

Angela 2*sqrt{3y^3} + y*sqrt{27y} - 2y*sqrt{3}