Answer:
19/
Step-by-step explanation:
We're told that the old lamp was 2 1/10 feet tall, let's convert this to an improper fraction;
We're also told that the new lamp is 4 feet tall.
To be able to determine how much taller is the new lamp than the old lamp, all we need to do is subtract the height of the old lamp from that of the new lamp as shown below;