Question

could anyone help me with these im lost :P
1. find the radian measure of an angle of -280 degrees
A. 9/-14pi
B. -14pi/9
C. 9pi/-14
D. -14/9pi

2. find the degree measure of an angle 3p/5 radians.
A.1.88 degrees
B. 108 degrees pi
C. 108 degrees
D. pi/300

3. find the exact values of cos( 3pi/4 radians) and sin(3pi/4 radians)

A. sqr(2)/2, sqrt(2)/2
B. -1/2, sqrt(3)/2
C. - sqrt(2)/2, sqrt(2)/2
D. - sqrt(3)/2, 1/2