Find the measure of each angle indicated

Aiden drives to school and back each day. the school is 16 miles from his home. he averages 40 miles per hour on his way to school. if his trip takes 1 hour, at approximately what speed does aiden drive home?

Negative 5 1/12 + negative 4 1/4 + 6 3/4

Points a, b, and c form a triangle. complete the statements to prove that the sum of the interior angles of triangle abc is 180