For #11 you add 54 + 59+ 57+ 54. Then you have 224. Then divide 224 by 4 since there are 4 numbers. Your answer should be 56 inches as the average, or mean.
Remember, when you divide, you divide by the number of all the numbers. I'm trying to make sense but hope this helps!
Answer: one value
Step-by-step explanation:
8 - x = 9
collecting the like terms
x = 8 - 9
x = -1
I think it's B I might be wrong I hope it helped