Math test please help

Plz hurry evaluate the expression a+b where a=8 and b=19

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

700 miles the train takes 5 hours to a travel the distance at what unit rate is the train traveling?