The ages of nine people in an elevator were as follows: 17, 27, 2, 9, 48, 22, 65, 17, 22. What is the mode of the data? Type a numerical answer in the space provided. If there is more than one answer, use a comma to separate your answers. Do not use any spaces. (example: 12,13

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 speed is the fastest (use 1 mile ≈ 1.6 kilometers)? a. 12 miles/hour b. 18 feet/second c. 19 kilometers/hour d. cannot be determined

Aubrey read 29 books and eli read 52 books what number is equal to the number of books aubrey read?