Should students learn alternate interior angles in 8th grade

Jackie purchased 3 bottles of water and 2 cups of coffee for the family for $7.35. ryan bought 4 bottles of water and 1 cup of coffee for his family for 7.15. how much does each bottle of water cost? how much does each cup of coffee cost?

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?

The square root of 9x plus 7 plus the square rot of 2x equall to 7