What is the GCF and how is it used to find the simplest form of a fraction

Jackie purchased 3 bottles of water and 2 cups of coffee for a family for $7.35. brian bought 4 bottles of water and 1 cup of coffee for his family for $7.15. how much does each bottle of water cost? how much does each cup of coffee cost? i need this done

Find the greatest common factor of -30x 4 yz 3 and 75x 4 z 2.

How do i put 3(x+7) in distributive property