I need the steps of solve ​

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angle measure.

This stem-and-leaf plot represents the heights of the students on ralph's basketball team. one student's height is missing from the plot. if the mean height of all the students on the team is 61 inches, what is the missing height? a. 55 in. b. 59 in. c. 61 in. d. 65 in.

Im literally having a mental breakdown