in mei lins school, her science teacher gives tests that are marked out of 100. mei lin has an average of 60 marks on her first four science tests. on the fifth test she got 80 marks. what is the average of mei lins marks in science after all five tests?

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

Solve the equation -9p - 17 =10 a -3 b. 16 c. 18 d -16

Becca wants to mix fruit juice and soda to make a punch. she can buy fruit juice for $3 a gallon and soda for $4 a gallon. if she wants to make 28 gallons of punch at a cost of $3.25 a gallon, how many gallons of fruit juice and how many gallons of soda should she buy?