The expression 12x+15x-11x can be combined because of which property

The figures below are made out of circles, semicircles, quarter circles, and a square. find the area and the perimeter of each figure and give your answers as a completely simplified exact value in terms of π (no approximations).

Asequence is defined recursively using the formula f(n + 1) =f(n) - 5. which sequence could be

Acircus act has 3 times as many elephants as acrobats. jorge noticed that all together there were 56 legs in the circus ring. how many elephants were in the show?