Help me with this and I will give brainliest

He that is measured at 220° is a reflex angle. the opposite angle is obtuse. find the measure of obtuse .

Find the midpoint m of z1=(8+5i) and z2=(12+3i)

Last month, a 770 g box of cereal was sold at a grocery store for $3.10. however, this month, the cereal manufacturer launched the same cereal in a 640 g box, which is being sold at $2.50. what is the percent change in the unit price?