If f(x)=2x to the second power what is f(x) when x=3

Factor this polynomial completely x^2-64

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.

Find the value of x for which line a is parallel to line b