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AnimeBrainly
It is only asking for the 3/4 length buttons
There are 3 of them

Lining them up means adding them together

3/4 + 3/4 + 3/4 = 9/4, or 2 1/4

2 1/4 should be your answer

hope this helps
3/4 + 3/4 + 3/4  = 9/4  

= 2 1/4 inches Answer