Consider the standard form equation 2x-ry=30. what value of r causes the graph to have a y-intercept of 5?

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 of the fallowing best completes the sequence 5,10,15, a) 30 b) 22 c)25 d)35

What is the order of magnitude for the number of liters in a large bottle of soda served at a party