Answer:
Option 4 is correct
Step-by-step explanation:
The formula of the Trigonometric Identity Sine is,

8 - 45k - 40 = 3k - 1
-32 - 45k = 3k - 1
+ 1 +45k +45k + 1
_________________
-31 = 48k
-0.689 = k
Answer:
I believe the answer is C.
Step-by-step explanation:
The others are not Parent functions. I honestly don't know about D. But, I really doubt that is the answer. So, ruling out the others, I would go with C. I hope this helps!
Answer:
∠AFB = Acute
∠DFB = Obtuse
∠CFD = Right
Step-by-step explanation:
∠AFB is acute b/c its less than 90°
∠DFB is obtuse b/c it more than 90°
∠CFD is right b/c it's exactly 90°