Urgent...Trig...help please!!!!

Problem 1

If tan (theta) = 4, find

a. tan (- theta)

b. tan (theta + pi)

c. tan (pi - theta)

d. cot (pi/2 - theta)

Problem 2

The terminal ray for the angle theta is in the second quadrant. Which quadrants are the following rays in?

a. neg theta

b. theta + pi

c. pi - theta

d. pi/2 - theta

Problem 3

The terminal ray for the angle theta is in the third quadrant. Which quadrants are the following rays in:

a. neg. theta

b. theta + pi

c. pi - theta

d. pi/2 - theta

Please explain!!!

Please help!!! I have no idea where to start. This is homework due tomorrow and I am scheduled to meet a tutor tomorrow so I can learn this stuff.