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3. a. To estimate the density of deer in a wildlife area, you need to know the number of deer and the area of the wildlife. b. To estimate the density of trees in a forest, you need to know the number of trees and the area of the forest.

**1. a. A situation where a rate would be used as a good comparison would be when you want to find out how fast someone can run in a certain number of miles. b. A situation where you would use a unit rate as a comparison would be if you want to know how many students ride on each school bus. 2 **.** There are 17 girls and 13 boys in Mr. Baldridge's class. Write every comparison you can think of that can be formed from this information. -Out of 30 students, 43% of them are boys and 57% of them are girls. -The ratio of girls to boys is 17 to 13. -There are 4 more girls than boys.
 * Mathematical Reflections: Choosing Strategies

3. On 1 gallon of gas you can go 33 miles. On 12 gallons of gas, Rodrigo went 400 miles, his total destination.

5. You can recognize a situation in which you need to use a ratio comparison rather than simply finding differences by seeing what the two variables are.