What is the perimeter of the shape formed by the points (0,0), (7,0), (10,4), and (3, 4)?

Can someone me and plz do the problem

Fanny mendelssohn manages all the magazines and paperback books at a local grocery store. she prices many paperbacks to sell at $7.99. the cost to the store is $5.29. what is the markup rate on a paperback book, based on its cost?

Ineed to know the answer to this algebra question.