What is the equation of this graph

With #! i’ve tried to figure it out but i can’t.

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?

You deposit $5000 each year into an account earning 3% interest compounded annually. how much will you have in the account in 30 years?