Students simulate business situations—using spreadsheets, formulas, and graphs—to explore the concept of functions. Students begin to think about the relationship Profit = Income – Expenses as they play a pencil-and-paper business simulation game. They then learn how to set up simple spreadsheets to test different “What If…?” questions that they pose about different business situations. They then look at data from several fictitious businesses (a t-shirt company and a movie theater) to compare income, expenses and profits with tables and graphs and make a recommendation to the companies.

### NCTM Standard: Algebra

• Understand patterns, relations, and functions
• Represent and analyze mathematical situations and structures using algebraic symbols
• Use mathematical models to represent and understand quantitative relationships
• Analyze change in various contexts

### Primary Mathematical Goals

• Use the formula for the profit-income-expenses relationship: Profit = Income-Expenses
• Use the formula for calculating income: Income = Number sold x Price