A and B can do the work in 8 days ; B and C can do the work in 12 days ;A ,B and C together can finish it in 6 days .In how many days A and C together will do the same work

Determine whether the set of whole numbers is closed under addition. explain why the set is or is not closed. give an example.

25 ! i need asap! ! ill mark brainliest!

Rhombus adef is inscribed into a triangle abc so that they share angle a and the vertex e lies on the side bc . what is the length of the side of the rhombus if ab=c, and ac=b.