What is the domain of the graph to the left

The line containing the midpoints of the legs of right triangle abc where a(-5,5), b(1, 1), and c(3, 4) are the vertices.

There are 15 plates and each plate is either 7 or 12 inches diameter. which systems of equations do you use to find the number of 7 inch plates, x and 12 inch plates, y

Which is the solution to the inequality? 2 3/52 1/15 b< 3 2/15 b> 3 2/15