Todd wants to put 1/8 of a kilogram of bird seed in each of the bird cages in his pet shop. He has 7/8 of a kilogram of bird seed left. How many cages can he refill with bird seed?

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