Question for big math test please answer

Simplify the expression and find the missing terms. the simplest form of has in the numerator and in the denominator.

What is the solution to the equation? k/6.4=8.7 2.3 5.568 15.1 55.68

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.