Answer:

Step-by-step explanation:

-850 feet,
-1200+800-450,
Assuming that it started at 0
Answer:
19.7
Step-by-step explanation:
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13 years
Step-by-step explanation:
17 + 15 + 23 + 23 + 23 =101 / 5 = 20.2
Mean before was 20.2
In order for the mean to be 19, all those numbers would have to add up 114 to be divided by 6 and have a mean of 19
114 / 6 = 19
114-101 = 13 is that number
17 + 15 + 23 + 23 + 23 + 13 = 114 / 6 = 19
6b=-6
b=-1
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