IM 7.6.23 Lesson: Applications of Expressions

Decide whether this expression is equivalent to . Explain how you know.

Estimating the temperature in Fahrenheit when you know the temperature in Celsius

1. Double the temperature in Celsius, then add 30.
2. Add 15 to the temperature in Celsius, then double the result.

Calculating a 15% tip on a restaurant bill

1. Take 10% of the bill amount, take 5% of the bill amount, and add those two values together.
2. Multiply the bill amount by 3, divide the result by 2, and then take  of that result.

Changing a distance in miles to a distance in kilometers

1. Take the number of miles, double it, then decrease the result by 20%.
2. Divide the number of miles by 5, then multiply the result by 8.

• Mai says that it doesn’t matter in which order you use them. You will get the same discount either way.
• Jada says that you should apply the 20% off coupon first, and then the $30 off coupon.
• Han says that you should apply the $30 off coupon first, and then the 20% off coupon.
• Kiran says that it depends on how much you are spending.