The questions are: (calculators allowed)

1. If sec theta=-(5/4) and sin theta>0, then tan theta=???

2. If x is an angle in quadrant III and tan(x-30(degrees))=cotx, find x

3.Expressed as a function of an acute angle, cos 310(deg.)+cos 190(deg.)=???

I can list the multiple choice answers if that helps, and when explaining, use diagrams if possible to help me understand better, thank you.