Can someone please help me? I'm on test (number 3)

Can someone answer it, and plot it, for 20 points and brainliest answer? p.s. they're the same ! : )

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?

How do you find the circumfrance of a circle?