Which problem is solved using this model? a. 2 divided by 1/8 b. 1/4 divided by 2 c. 8 divided by 1/4 d. 2 divided by 1/4

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?

An angle that measures between 90 and 180° is called a(,

What is the rate of change of a line that passes through (2,-5) and (6,-2)?