Which of the following percents is more than 2 out of 6 but less than 3 out of 5?
a) 33%
b) 50%
c) 75%
d) 85%

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?

What is the length of the missing leg in this right triangle? 18 mm 24 mm 26 mm 32 mm

Which is the equation of a line perpendicular to the line with the equation 3x+4y=8