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You didn't post a file so I can't help you. Perhaps put a picture?
Answer:
mean:12
Step-by-step explanation:
The domain the given graph is :
- -12 <u><</u> x <u><</u> 13
N = ((n-1) + 4) + 4, to my understanding.
although your answers seem right written in the columns, but your method of applying numbers to equation seems incorrect in 'expand' column. for example, answer for 3 should be something like this...
3 21 17+4
4 25 21+4
hope it helps.