Is this correct? (checking answers)

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.

Each side length of the hexagons is 1, what’s the area of abc

If f(x)=1/x and g(x)=x+4 which of the following is the graph