Final Answer:
The expression for the total number of calories burned during the swimming workout is 7s.
Step-by-step explanation:
The problem states that s represents the time spent swimming. To find the total number of calories burned during the workout, we can use the formula
. In this case, the rate is given as 7 calories burned per minute 7 calories/minute. Therefore, the expression for the total number of calories burned Calories is 7s, where s is the time spent swimming in minutes.
Option C. 7s is the correct choice because it represents the product of the rate (7 calories/minute) and the time spent swimming s minutes. The other options do not correctly reflect the relationship between the rate and time.