Can someone help me please I don’t understand

Adding and subtracting matricesfind the value of each variable. x = and y = would

The standard distance between studs in a house is 1.5 feet. if you have a set of blueprints for a house that mark every 1.5 feet with 2 in., by how many inches will a 13-foot wall be represented?

The measure of one angle of an octagon is two times smaller that of the other seven angles. what is the measure of each angle?