Please help 35 point

Let w=23 . what is the value of w + 45 ?

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

Iwill give ! if m∠a=59 and m∠3=81°, what is m∠b? m∠b= _[blank]_°