What is the missing x-coordinate for a line that has a slope of -2 and goes through the points (5, 1) and (x, -3)

The coordinates r(1, -3), s(3, -1) t(5, -7) form what type of polygon? a right triangle an acute triangle an equilateral triangle an obtuse triangle

Factor and solve to find roots x squared -x - 90 =0

Whats are the trickiest steps to do when adding or subtracting rational expressions? how does knowledge of rational numbers u in adding and subtracting rational expressions?