PLS HELP ME! I NEED A 100! HELP!

Parabolas y=−2x^2 and y=2x^2 +k intersect at points a and b that are in the third and the fourth quadrants respectively. find k if length of the segment ab is 5.

If the equation of a perpendicular bisector of a triangle is y = 2x + 7, what is the slope of the side that it is bisecting? explain how you know. 

What is the slope of the line? the graph shows the relationship between the volume of a rectangular prism and the volume of a square pyramid with an identical base and height. prism vs. pyramid prism volume (cubic units) + 1 2 3 4 5 6 7 8 9 10 pyramid volume (cubic units)