You are setting up a children;s painting class. Poster board paints cost $3.80 for each child, and a package of 100 sheets of poster board costs $66.50. Assuming that you only need one package of poster board, write an algebraic exprssion for the total cost of supplies. Find the total cost if 18 students sighn up for the class too.

(3.8 * 18) + 66.50 = ?

134.9

To find the total cost of supplies, we need to consider the cost of the poster board paints and the package of poster board.

Let's define the variables:
Cost of poster board paints for each student = $3.80
Cost of the package of poster board = $66.50
Number of students = 18

We only need one package of poster board, so the cost of the package of poster board remains the same regardless of the number of students.

Now, we can write the algebraic expression for the total cost of supplies:

Total Cost = (Cost of poster board paints per student x Number of students) + Cost of package of poster board

Plugging in the values:

Total Cost = ($3.80 x 18) + $66.50

Calculating:

Total Cost = $68.40 + $66.50
Total Cost = $134.90

Therefore, the total cost of supplies for 18 students signing up for the class is $134.90.

To find the total cost of supplies for the children's painting class, you can add the cost of poster board paints and the cost of poster board sheets together.

Let's break it down:

1. The cost of poster board paints for each child is $3.80. Since there are 18 students, the cost of poster board paints for all the students can be found by multiplying the cost per child by the number of students:
Cost of poster board paints = $3.80 * 18 = 68.40

2. The cost of one package of poster board sheets is $66.50.

To represent the total cost of supplies as an algebraic expression, you can use the variable 'C' to represent the total cost. Thus, the expression is:
C = Cost of poster board paints + Cost of poster board sheets
= $68.40 + $66.50
= $134.90

Therefore, the total cost of supplies for the children's painting class, with 18 students signed up, is $134.90.