In exercises 25 – 28, define a variable to represent the unknown quantity and write an expression to describe the situation.

25. The unit cost represents the quotient of the total cost and number of items purchased. Write an expression to represent the unit cost of the following: The total cost is $14.50 for n objects.

26. The area of a square is the side length squared.

27. The total length of ribbon needed to make dance outfits is 15 times the number of outfits.

28.What is the remaining amount of chocolate squares if you started with 16 and have eaten some?