Answer:
21/28 please put that in your calc cause im not gonna bother
(hopefully that did not come across as condesending)
Explanation:
But the reason why is because when you flip the triangle to find the tan of angle z, you are looking for the opposite and adjacent sides to angle z
Given that the opposite side is 21 and the adjacent side is 28
and tan is equal to opp/adj
so your answer is 21/28