What is the supplementary angle to an angle that has 112 degrees?

Quick translate "x is 12 units from 20" into an equation. what are the values of x being described? if you can answer any of my other questions that'd be great too

A25- foot ladder leans against a building and reaches a point of 23.5 feet above the ground .find the angle that the ladder makes with the building

What are the coordinates of the image of p for a dilation with center (0, 0) and scale factor 2