Final answer:
To calculate the average distance Denise ran per day, we sum the total distance covered over the three days and divide by the number of days. The answer is 7.8 km per day, corresponding to option A.
Step-by-step explanation:
To find Denise's average distance per day after running 4.3 km on the first day, 6.1 km on the second day, and 13 km on the third day, you add these distances together and then divide by the number of days. The calculation is as follows:
- Total distance = 4.3 km + 6.1 km + 13 km = 23.4 km
- Number of days = 3
- Average distance per day = Total distance ÷ Number of days = 23.4 km ÷ 3 ≈ 7.8 km
Therefore, the average distance Denise ran per day is 7.8 km, which corresponds to option A.