Sydney and Neil went picking strawberries. Sydney picked 137 fewer strawberries than Neil did. Together, they picked 223 strawberries. How many strawberries did Neil pick?

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