In the first one the answer is letter B, if you divide 255 by 3 is gonna give you 85 then multiply 85 x 50 and its gonna give you 4,250. Let me know if im good or wrong. Have a great day :)
You can multiply opposite sides, like so:
y*7 = 8*3
7y = 24
y = 24/7
By definition of the trig functions,


We have
, so
, and
, so
.
Just to check: we should have

by the Pythagorean theorem. Indeed,
