Ron took a photograph of his car and then measured the length of the car in the photograph. The length was 4 1/2 inches. If the scale of the photograph is 1 inch = 4 feet, how long is Ron's actual car? A: 2 feet
B: 9 feet
C: 16 feet
D: 18 feet

Here is their argument. given the obtuse angle x, we make a quadrilateral abcd with ∠dab = x, and ∠abc = 90◦, and ad = bc. say the perpendicular bisector to dc meets the perpendicular bisector to ab at p. then pa = pb and pc = pd. so the triangles pad and pbc have equal sides and are congruent. thus ∠pad = ∠pbc. but pab is isosceles, hence ∠pab = ∠pba. subtracting, gives x = ∠pad−∠pab = ∠pbc −∠pba = 90◦. this is a preposterous conclusion – just where is the mistake in the "proof" and why does the argument break down there?

Which expression gives you the distance between the points (5,1)and(9,-6)

What’s 8y+48 and factor each expression completely