Do you know this please

If the scale factor between two circles is 2x/5y what is the ratio of their areas?

Which is the focus of a parabola with equation y2=4x

Will mark determine whether the conjecture is true or false. give a counterexample for any false conjecture. given: points r, s, and t conjecture: r, s, and t are coplanar. a) false; the points do not have to be in a straight line. b) true c) false; the points to not have to form right angles. d) false; one point may not be between the other two.