The expression 4x + 3 represents the length of a rectangle. The expression 2x + 1 represents its width. Which expression represents the perimeter of the rectangle?
A.10x
B.21x
C.6x + 4
D.12x + 8

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.

Well if you have 20 bats you probably want 20 balls? you don’t have enough context to answer the question.