What are the slopes of the sides that make this quadrilateral a rectangle?

-2 and 1/2
-1/2 and 2
-1/3 and 3
-3 and 1/3

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?

Solve each quadratic equation by factoring and using the zero product property. 10x + 6 = -2x^2 -2

Atrain leaves little? rock, arkansas, and travels north at 90 kilometers per hour. another train leaves at the same time and travels south at 80 kilometers per hour. how long will it take before they are 680 kilometers? apart?