please help!!!! im stuck on this oneeeeeeeeeeeeee and also explain

Please Help Im Stuck On This Oneeeeeeeeeeeeee And Also Explain class=

Answer :

Answer: B. 3n + 9

Step-by-step explanation:

there are 3 with an unknown value so it is 3n and there are 9 pieces that are each equal to 1 witch makes it 3n+9. hope this helps have a good day

the answer is b! 3n+9