A1_Single-Variable Expressions, Equations and Inequalities_UA-1.docx

# A1_Single-Variable Expressions, Equations and Inequalities_UA-1.docx

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Unit Activity Unit: Single-Variable Expressions, Equations and Inequalities This activity will help you meet these educational goals: Mathematical Practices— You will make sense of problems and solve them, use mathematics to model real-world situations, and use appropriate tools strategically. Introduction Have you ever made a mistake when trying to solve a math problem? It can be pretty easy to do, and often will result in losing points on an exam. In the real world, such mistakes can have more serious effects: Miscalculating how much gas you have left in your car will leave you stranded. Miscalculating how much money you have left in your bank account might cost you an overdraft fee. Even more serious, miscalculations have resulted in serious accidents happening many times. Once, as a result of not using the correct units, a satellite sent to Mars burned up in the atmosphere, wasting over \$300 million dollars. Fortunately, there are steps you can take to help avoid making errors along the way. One of these strategies is manipulating formulas so they are solving for the variable you want before you substitute values for the variables in the formula. This technique is especially useful when working with large, unwieldy numbers. __________________________________________________________________________ Directions and Analysis Task 1: A Journey to Earth Every moment of every day, light pours out from the Sun at the center of our solar system and travels to Earth. It does not arrive at Earth instantaneously though; it takes time to get here. Your task is to figure out how long it takes for light to travel from the Sun to Earth.

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• Fall '15
• baker
• Payday loan, serious effects

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