The number of minutes spent running each day
The number of minutes spent biking each day
The total number of minutes spent running and biking each day
The number of minutes spent biking for each minute spent running
Explanation
Correct answer: C.
Choice C is correct. Maria spends minutes running each day and minutes biking each day. Therefore, represents the total number of minutes Maria spent running and biking each day. Because , it follows that is the total number of minutes that Maria spent running and biking each day.
Desmos solution:
Note: The equation shows that x and y add to 75, so 75 is the total minutes spent running and biking.
Enter in Desmos:
Reviewed and rewritten by CookSAT
Why the other choices are wrong
Choice A
Choice A is incorrect. The number of minutes Maria spent running each day is represented by and need not be . The number of minutes Maria spends running each day may vary; however, the total number of minutes she spends each day on running and biking is constant and equal to .
Choice B
Choice B is incorrect. The number of minutes Maria spends biking each day is represented by and need not be . The number of minutes Maria spends biking each day may vary; however, the total number of minutes she spends each day on running and biking is constant and equal to .
Choice D
Choice D is incorrect. The number of minutes Maria spent biking for each minute spent running cannot be determined from the information provided.