Answer:
angle b = 25°
for angle A = 180 - 50 (ie 25 + 25)
angle a =130°
No because if you plug in 4 for x and 5 for y you get -4 not 36
This is the answer the x=3 and the y=2
We have:

Then we use trigonometric identities to change the negative sign of the trigonometric functions, so:

We clear f(x):

we simply what we can:

Thus, the correct answer is;