### Home > CCAA > Chapter 7 Unit 6 > Lesson CC2: 7.2.2 > Problem 7-114

Write an equation to represent the situation below and answer the question. You may use the 5‑D Process to help you.

Andrew just opened a new office-supply store. He has been keeping track of how many customers visit his store. During his second week, he had

Create an expression to represent this problem using a variable, . Try to write and solve for an equation, or if necessary, use the 5-D Process you learned earlier.

Each of the weeks ultimately relates to the first week, so we can define the first week's customers as . Write expressions for each of the other weeks based on the variable.

First week :

Second week:

Third Week:

Fourth Week:

Create an expression by summing up each of the week's customers to total *second* week.