Which of these polar ordered pairs does NOT describe the point graphed below? (4

Question

Which of these polar ordered pairs does NOT describe the point graphed below? (4, pi/4) (-4, 5pi/4) (-4, 9pi/4) (4, -7pi/4) The path of a train is described by this set of parametric equations, in terms of h hours. x(h) = 20h y(h)=75h+100 A second train departs a station from location (-30, 94) at the same time as the first train. After 3 hours, the trains collide. What is the location of the crash? Which set of parametric equations describes the path of the second train? (60, 325); (x, y) = (30h - 30, 77h + 94) (235, 60); (x, y) = (77h + 4, 30h - 30) (60, 325); (x, y) = (77h + 4, 30h - 30) (235, 60); (x, y) = (30h - 30, 77h + 94)

Explanation / Answer

A is correct
angle from 4 is indeed pi/4

B is correct
Angle from -4 to that point is indeed pi+pi/4 = 5*pi/4

C is wrong

D is correct
angle from 4 is indeed pi/4 which is also same as pi/4 - 2pi = -7*pi/4

Answer: C

I am allowed to answer only 1 question at a time

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