Ten less than 40% of a number is -4. Please just write out equation >~

Factor this polynomial completely x^2-64

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?

Find the area of an equilateral triangle with a side of 6 inches