The inequality that can be used to find the greatest number of plants you can buy is p ≤$20 / 1.50.
Here are inequality signs and what they mean:
> means greater than
< means less than
≥ means greater than or equal to
≤ less than or equal to
The inequality sign that would be used in this question is ≤.
(cost of plant x number of plants) ≤ total spending money
$1.50p ≤ $20
p ≤ $20 / 1.50
To learn more about inequality, please check: https://brainly.com/question/5031619
