What inverse operation would i use to solve 5x=45?

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 discriminant if a quadratic equation is 4 which statement describes the roots?

In a column proof the right column states your reasons