Use an addition or subtraction formula to find the exact value of the expression sin(285°)

The price of a dozen eggs was $1.63. suppose the price increases m dollars per dozen and then the price decreases $0.12 per dozen. which expression represents the current price of eggs after the two price changes?

What is the angle measure, or angle of depression, between this bird and the bird watcher?

If cos(θ)=2853 with θin q iv, what is sin(θ)?