How the greatest common factor of the numbers 10 and 15 can be used to reduce the fraction 10/15

Katlyn made 4 dresses with 7 yards of fabric. how many yards did she use on 1 dress?

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 expression is equivalent to 3^3 + 2^2?