Could anyone help me with some basic math questions?

Question 3 and 4 on sample sheet 4 of this website have got me stumped - i think question 4 is z=31 as it is parallel to the other 31 degree angle but question 3 has me stumped - please help! a href="http://www.naplan.edu.au/verve/_resources/NAP08_num_y9_calc_web_v10.pdf" rel="nofollow"http://www.naplan.edu.au/verve/_resource…/a