Given the following use a Pythagorean identity to find sin(0) if 0 is in quadrant II

C.

Step-by-step explanation:

In trigonometry, we have an equation as following:

Replace θ into the above equation, we would have:

(sine θ)^2 + (cosine θ)^2 = 1

=> (sine θ)^2 = 1 - (cosine θ)^2 (1)

As given, we have cosine θ = -3/7. Replace it into the equation (1), we have:

(sine θ)^2 = 1 - (-3/7)^2

=>(sine θ)^2 = 1 - 9/49 = 40/49

=> sine θ = ± = ±

So sine θ = or  sine θ = -  

However, as θ is in quadrant II, sine θ has a positive value

=> sine θ =

So that the correct answer is C

x=30

step-by-step explanation:

the function makes a strait line horizontally with no x intercept but a y intercept at 9.