Why would you use associate property of multiplication to solve (10x4)x2? how would you regroup the factors?

I would regroup them by having (4x2)x10. Because, all you do is add a zero to the product that you get in the parenthesis. 

Your answer would be ahere is how: perimeter is how long all the sides are. in a rectangle, there are two sets of parallel sides. so, to find this, we would to the following.(15x2)+(4x2)30+838if you have questions ask! and mark me brainliest! i really wanna level up : 3