What is the mean of the following numbers?

x-3a, x-2a, x-a, x,x+a

72 the length of a side of a triangle is 36. a line parallel to that side divides the triangle into two parts of equal area. find the length of the segment determined by the points of intersection between the line and the other two sides of the triangle.

Find the dimensions of the circle. area = 64π in.² r= in.

Matt had 5 library books. he checked out 1 additional book every week without retuening any books. whats the matching equation