I have this statistic hw that has to do with fisher information. I don’t even know where to start and it’s 3 parts

What is the missing reason in step 5? linear pair postulategivendefinition of complementary anglescongruent complements theorem

If sec theta = 5/3 and the terminal point determined by theta is in quadrant 4, then

Solve for x and y a x= 13.3 y= 16.7 b x= 23.3 y= 12.5 c x= 7.5 y= 16.7 d x=7.5 y= 12.5