"marina burns calories at a rate of 15 calories per minute when running and 6 calories per minute when walking. suppose she exercises for 60 minutes by running for r minutes and walking for the remaining time. the expression 15r+6(60-r) represents the calories burned. what does each term represent? "

Step-by-step explanation:

Marina burns calories at a rate of 15 calories per minute when running.

Let she runs for r minutes.

Therefore, number of calories burnt in r minutes running = 15r calories

Now it is given that she exercises for 60 minutes, in which she runs for r minutes so remaining time for walking will be = (60 - r) minutes

Calories burnt in walking is given as 6 calories per minute

Therefore, calories burnt in (60 - r) minutes walking= 6(60 - r) calories.

Finally total calories burnt in exercising for 60 minutes will be represented by [60r + 6(60 - r)] calories.

yes the total will be same because in both of them the expression.is rearranged but their sign remains the same hence it hss just been shuffled

you already gave the answer

step-by-step explanation: