URGENT please help A helicopter climbs at an angle of 20 with the ground. Find the ground distance the helicopter has traveled if it has moved 1780 m through the air.
(round your answer to the nearest tenth)

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?

(hurry! ) which expression is equivalent to the following complex fraction?

Which inequality is equivalent to -3x < -12? x < 4 , x < -4 , x > 4, x > -4