I may just lack brain cells but what does it mean by compare?

Answer:
By compare it mean to compare b and a
Step-by-step explanation:
You would say/type/write "A has five students while B Has 9" Boom easy
Answer:
estimate, measure, or note the similarity or dissimilarity between.
Step-by-step explanation:
ENJOY LIFE WHILE YOU STILL CAN KIDDO!!!