Help ehehshshhnhdhcbdnd

Simplify (a/b - b/a) times (a - a^2/a+b) a - a^2/a=b is a mixed number

What expression is equivalent to 42x-56y

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.