Me ! urgent needed! if 85c - 170a = 306, and 255a + 85b = 714, then what is the average of a, b and c?

What number should be added to both sides of the equation to complete this square? x^2-10x=7

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.

Which function has the domain x> -11?