Can someone me? how do i solve for the exact value?

sin(α + β) = sin(α) cos(β) + cos(α) sin(β)

sin(α – β) = sin(α) cos(β) – cos(α) sin(β)

These are the sine identities that we have to use 

The angle here is 255, we have to use differnet angles so that we know their sine and cosine. 

255=45+210
210=180+30
This is enough to solve the problem, you need to use algebra now and search for the sine/cosine of 30,45,180 degree.

costs the what? what is the cost of the pants?

step-by-step explanation:

if it is $10, then the price is 14.

take 40% of the cost, and then add the cost.

40% of 10 = 4

4+10 = 14.