You can't compare apples and orange

Write a recursive sequence that represents the sequence defined by the following explicit formula:

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?

Ateacher noticed 5/8 of the students were wearing either blue shorts or white shorts. write two different ways this could be done.