I don’t understand what to do?

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?

What is the solution to the equation? k/6.4=8.7 2.3 5.568 15.1 55.68

Awasher and a dryer cost $701 combined. the washer costs $51 more than the dryer. what is the cost of the dryer?