Express the sum of each pair of numbers as a product of greatest common factor of the numbers and another sum

Florence price's brownies and more sells all types of cookies and pastries. on tuesdays, they markdown all brownies 75% to a sale of $1.50 a dozen. find the selling price and the markdown of a dozen brownies.

How can you tell when x and y are not directly proportional?

The volume of a box varies directly with its length if a box in the group has a length of 30inches and k=24 what is its volume