Three plus the reciprocal of a number equals 7 divided by that number. what is the number

These question are hard can you me with answers

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?

Use the elimination method to solve the systems of equations.choose the correct ordered pair. 7x+4y=39