Please help I have till tomorrow to finish this :(

Standard deviation of 19,29,21,22,23

If two angles of a triangle have equal measures and the third angle measures 90°, what are the angle measures of the triangle? a. 60°, 60°, 60° b. 45°, 90°, 90° c. 30°, 30°, 90° d. 45°, 45°, 90°

Astudent showed the steps below while solving the inequality |x-4|< 1 by graphing.