Hello! :) Please help me solve this + explain your answer :)

I will indeed give you Brainlst <3

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.

Graph the equationy= x+3[tex]y = x + 3[/tex]

If you have 12 feet of string and you cut it into equal length of 5 inches each how much string will be left