Which is the correct form of the quadratic formula? a) x = b ± b2 - 4ac a b) x = b ± b2 - 4ac 2a c) x = - b ± b2 - 4ac a d) x = - b ± b2 - 4ac 2a

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?