How are you idiots failing ONLINE school lol​

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?

Sum is 17 and their difference is 3

Atriangle with all sides of equal length is a/an triangle. a. right b. scalene c. equilateral d. isosceles