Help please I need answers ASAP

Nneeedd 1.find the residual if you know the actual number is 5.2 and the predicted value is 4.8

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.

If the value of cos330°is√3/2 then find cos 165°.