Two more than a certain numbers 15 less than the product of 7/8 and the number

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?

Express in the simplest form: (x^2+9x+14/x^2-49) / (3x+6/x^2+x-56)

How is the interquartile range calculated?