Answer: -20.4 pounds
Explanation:
To find the total weight Judy lost, you would multiply the amount she lost each week (1.7 pounds) by the number of weeks she has been dieting (12 weeks).
1.7 pounds/week * 12 weeks = 20.4 pounds
Since the weight loss is to be expressed as a negative number, Judy's total weight loss is -20.4 pounds.