Use each digits 2,3,7,8 to make numbers from 20,21,22 so on all the way to 50 for example 2+3+7+8=20

Given the points a(-2, 1) and b(8, 6), find the coordinates of the point c on directed line segment ab, that partitions ab in the ration 2: 3.

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).

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)