Answer:
the index of 2 is -1
Step-by-step explanation:

=
=
Triangle 3 because its length is longer than the others.
Answer: 3
Step-by-step explanation: 2+2-1=3
Answer:
The number of enrollments increased by 5%.
Step-by-step explanation:
Given that:
Number of students at the beginning of the year = 480
Number of students at the end of the year = 504
Change = 504 - 480 = 24
This indicates increase.
Percent of change = 
Percent of change = 
Percent of change = 5%
Hence,
The number of enrollments increased by 5%.