Lexi rides her bike 21 miles in 3 hours. write each as a unit rate.

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

This is about circle theorems. someone asap : (

If f(x) = 2x + 8 and g(x) = x4, what is (gº)?