Is it a linear function or exponential function

Evaluate 4 a for a = 5 2/3 . express your answer in simplest form.

One of the same side angles of two parallel lines is 20° smaller than the other one. find the measures of these two angles.

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?