Answer: Heather and Matthew have walked approximately 1.728 kilometers eastward to the store.
Explanation: you can use the formula:
Distance = Speed x Time
First, you need to convert the time from minutes to seconds because the speed is given in meters per second. So, 38 minutes is equivalent to 38 * 60 = 2280 seconds.
Now, plug in the values:
Distance = 0.76 m/s x 2280 s
Distance = 1728 meters
To convert meters to kilometers, you can divide by 1000 because there are 1000 meters in a kilometer:
Distance = 1728 meters / 1000 = 1.728 kilometers