Answer:
8/625
Step-by-step explanation:
bc i guessed and its says 8/625
Cos28 = x/4 so to get rid of the fraction , multiply each side by 4 so it'll be
4cos28 = x
x = 3.531790371
Hope this helps=)

Hope you could get an idea from here.
Doubt clarification - use comment section.
Wouldn't you use sin, cos, tan?
Answer:
I believe its -68 but i could be wrong, because that's not a rational number, but it could also be -4080/60