Subtract 79 from both sides to isolate variable b.
b = 159 - 79
b = 80
Answer:
The answer is 4
Step-by-step explanation:
Cos θ = adj/hyp = 5/sqrt(5^2 + (-12)^2) = 5/sqrt(25 + 144) = 5/sqrt(169) = 5/13
Here is a general rule for sin and cos
sin x = cos (90 - x)
cos x = sin (90 - x)
These rules are complementary, so for your problem
cos 75 = sin (90 - 75) = sin 15 as your answer.