The sum of two, x and y

The parabola x= √y-9 opens: a.)up b.)down c.)right d.)left

Write 17/20 as a decimal and as a percent.

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?