1. **State the problem:** Melanie walks 3.5 miles each day and burns 140 calories per mile. We need to find how many calories she burns each day. 2. **Formula:** Total calories burned per day = (miles walked per day) \times (calories burned per mile) 3. **Apply the values:** $$\text{Calories} = 3.5 \times 140$$ 4. **Multiply decimals:** $$3.5 \times 140 = (3.5 \times 100) + (3.5 \times 40)$$ $$= 350 + 140 = 490$$ 5. **Answer:** Melanie burns **490 calories** each day she walks. 6. **Check options:** The correct choice is B 490 calories.