I’m having a hard time with problems 3 thru 7 and was hoping i could get some

34 cup. a serving of vegetable soup is 23 cup. the restaurant sold 20 servings of chicken noodle soup and 18 servings of vegetable soup. how many more cups of chicken noodle soup did they sell than cups of vegetable soup?

Simplify a7/a4 a) 1/a3 b)-a/a2 c)a4/a3 d)a3

Prove that the sum of two consecutive exponents of the number 5 is divisible by 30.if two consecutive exponents are 5n and 5n + 1, then their sum can be written as 30.