Answer:
He is correct because the key term is "greater than". This indicates that inequalities should be used here. Now, we write the inequality.
Step-by-step explanation:
Let L = length
Let w = width
Perimeter = 2L + 2w
L = 100
Perimeter > 400
2(100) + 2w > 400
200 + 2w > 400 is the inequality
Subtract 200 on both sides of inequality.
2w > 200
w > 100
The width is at least 100 centimeters.