A pattern is made using matchsticks. b) Complete the table. c) Write down the rule in your own words.

Here's the solution to the matchstick pattern and puzzle:

b) Complete the table:
For 1 pentagon, 5 matches are used.
Each additional pentagon shares one side, so it adds 4 new matches.

• Number of pentagons (n): 1, 2, 3, 4, 5, 10, n
• Number of matches: 5, 9, 13, 17, 21, 41, $4n+1$

c) Write down the rule in your own words.
To find the number of matches, start with 5 matches for the first pentagon, then add 4 matches for every additional pentagon.