Answer:
0.42 pounds
Explanation:
To find the difference in the amount of vanilla and chocolate ice cream, we can subtract the amount of chocolate ice cream from the amount of vanilla ice cream.
Difference in ice cream = vanilla ice cream - chocolate ice cream
= 1.7 pounds - 1.28 pounds
= 0.42 pounds
Therefore, Emmanuel bought 0.42 pounds more vanilla ice cream than chocolate ice cream.