What is the mean ? 50, 55, 58, 58, 90, 92, 99

Segment an is an altitude of right δabc with a right angle at a. if ab = 2, squared 5 in and nc = 1 in, find bn, an, ac.

If you have a set of parallel lines a and b cut by transversal x, if angle 1 = 167 degrees, what is angle 4 and why. also what is the measure of angle 5 and why? you need to use the names of the angle relationship and explain.

Find the length of the normal and the angle it makes with the positive x-axis. (see pictured below)