Chapter 4 - An Introduction to Functions - Cumulative Test Prep - Gridded Response - Page 288: 21

1.25 kilometers

First lets multiply 25 with 50 so that we get the distance Tamara swims in meters. 25 $\times$ 50 = 1250 meters Now, since there are 1000 meters in 1 kilimeters, lets divide Tamara's distance by 1,000 in order to get her distance in kilometers. $\frac{1250}{1000}$ = 1.25 kilometers So Tamara swims 1.25 kilometers.