A chef cooks 4 pounds of pasta. She serves 1/8 pound of pasta on each plate. What is the total numbers of plates the chef serves with 4 pounds of pasta

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