Factors, common factors and GCF of number 12 & 16?

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

Does the point (1, sqrt 7) lie on circle shown.

If the sales price of a dvd is $20 and the markup is 34%, what is the cost of the dvd?