For 4 or more songs, the cost varies directly as the number of songs. How much does it cost to master 6 songs?

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?

If f(x)= sqrt4x+9+2, which inequality can be used to find the domain of f(x)?

Which expression is the factorization of x^2+10+21