Idk how to do this could someone asap and can they do the steps

What is this equation in point-slope form?

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.

Check all that apply. f is a function. f is a one-to-one function. c is a function. c is a one-to-one function.