Answer these 3 questions, 20 points and brainliest :)

Measures of the angle of r, 31 s (x+4) t (3x+9)

Is the square root of 4 plus the square root of 16 rational?

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.