At the end of your birthday party there were 8 glasses of juice left over . there was 1/4 cup of juice in each of those glasses. how many cups of juice were left?

M∠abc=138° and m∠def=31° . which statement is true about ∠abc and ∠def ? a: the angles are neither complementary nor supplementary. b: the angles are complementary. c: the angles are supplementary.