As a reward for achieving their goals, all students in the ninth grade are invited to an ice cream party.

1) Write an expression that could represent an estimated cost for the party. Use at least one letter. State what each part of the expression represents.

2) Choose a letter in your expression. Describe the values that would be reasonable for the quantity that the letter represents.

The expression that represents the estimated cost for the party is T=s*i

Step-by-step explanation:

1) We can get an estimated cost for the party by using the following expression:

T=s*i

where:

T: total cost of the ice cream party ($)

s: number of ninth students (person)

i: unit cost of ice cream ($/person)

2) If we choose the letter "s", it can take whole number values.

For example: s={1,2,3,4,5, ...,25}

If we choose the letter "i", it can take rational values (sometimes the price of the items are not expresed as a whole number).

For example: s={1.25,2.50,3.00,4.75,5.00}