I need help. idk how to do ratios

Me because some of question i don’t understand

When the solutions to each of the two equations below are graphed in the xy-coordinate plane, the graphs of the solutions intersect at two places. write the y-cordninates of the points of intersection in the boxes below in order from smallest to largest. y=2x y=x^2-3

Simplify (1/2)4th power a. (1/16) b.(1/8) c.(1/4)