I need help with this pls

Which sum or difference identity would you use to verify that cos (180° - ∅) = -cos ∅? a. sin (α -β) = sin α cos β – cos α sin β b. cos (α -β) = cos α cos β – sin α sin β c. cos (α -β) = cos α cos β + sin α sin β d. sin (α + β) = sin α cos β + cos α sin β

Create a data set with 8 points in it that has a mean of approximately 10 and a standard deviation of approximately 1.

Which graph represents the linear function below? y-3=1/2(x+2)