64. 26*3=78, 11*3=33, 78-33=45, 45+19=64
Answer: $1750
Step-by-step: see the picture
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C. There is one outlier, indicating an abnormally large number of books were rented out on that day.
The data shows numbers ranging from 10 to 19 which is normal. However there is a significantly larger number, 99, which is the outlier.
The answer to this equations is 30.
The first month will cost $35. 2nd month $50. 3rd month $65. 4th month $80. 5th month $95. Price goes up $15 dollars each month.