List all possible rational roots of x4 – 13x3 – x + 15 = 0.

Which statement about perfect cubes is true

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?

Which one ? is the answer and how to find this answer