Answer:
A. 
Step-by-step explanation:
Applying the leg rule which is:

Hypotenuse = 4 + 8 = 12
Leg = x
Part = 8
Plug in the values

Cross multiply





The correct answer is b I believe
Answer:
hello : (f-g)(x) = -5^x +3x-2
Step-by-step explanation:
(f-g)(x) = f(x) - g(x) = (-5^x-4) - (-3x-2) = -5^x-4 +3x+2
(f-g)(x) = -5^x +3x-2
Cos(arcsin(u)) = √(1 - u²)
_____
You want cos(α) where sin(α) = u.
You know that
cos(α)² + sin(α)² = 1
cos(α)² = 1 - sin(α)² = 1 - u²
cos(α) = √(1 - u²)