1 is your answer. subtract 2 from -4 which is -6. since you have to do the same to both sides then 2-2=0. now your equation is -3=9-6x. -3+9=6. 6=6x is 1
Yes that statement is true.
This question is asking "Where does cosine equal

?"
Based on our unit circle values and the domain of the cos^{-1} function, we see that at 30 degrees, or

, cosine is equal to

.