6.) What is the quotient of 3 / 4ab² and 1 / 8b ?

7.) What is the sum of a/b and a/b ?

8.) The difference of 2x+3 / x+2 and 3x-6 / x+2 is equal to _____.

9.) Mark can paint the room in 6 hours, while Louie can paint the same room in 4 hours. If they will work together, in how many hours can they finish painting the room?​