Ihave 6 surfaces. 2 0f my surfaces are smaller than the others. i can stand up tall. what shape am i?

Simplify (a/b - b/a) times (a - a^2/a+b) a - a^2/a=b is a mixed number

Find the sum of the given arithmetic series. 24 + 17 + 10 + 3 + + (–39)

An angle bisector ac divides a trapezoid abcd into two similar triangles ? abc and ? acd. find the perimeter of this trapezoid if the leg ab=9 cm and the leg cd=12 cm.