Maggie's drink coaster has a radius of 4 centimeters. What is the coaster's area?

Isaac wants the equation below to have no solution when the missing number is placed in the box. which number should he place in the box?

What are linear equations? could'ya explain too me, ? ! and how do you see what graph is a proportional relationship?

If the equation of a line containing the midsegment of a triangle is y = -1/4x -11, what is the slope of the triangle side that is opposite the midsegment (the one not touching it). explain how you know.