'simplify 3(a^2)(b^2) x 4(a^3)b.' is my answer correct?

i got 3ab^6 x 4ab^4, which was then 12ab^10.

i'm confused about multiplying a and b when both have different powers.

Np4=12np2 with clear explanation.

Adam drew two same size rectangles and divided them into the same number of equal parts. he shaded 1/3 of one rectangle and 1/4 of the other rectangle. what is the least number of parts into which both rectangles could be divided into?

Hiroaki wants to find 3 3/4 - 7/8 explain why he must rename 3 3/4 to do the subtraction.