Simplify (8m - 4n) + (6m + 3n).
someone me.

A20? -foot ladder is placed against a vertical wall of a? building, with the bottom of the ladder standing on level ground 19 feet from the base of the building. how high up the wall does the ladder? reach?

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

In the xy-plane, if the parabola with equation passes through the point (-1, -1), which of the following must be true?