The computation shows that the difference in depth is 16 feet
<h3>How to calculate the value?</h3>
From the information, in January, it measured 6 ft deep, or |−6|, and in July, it was -22.
Therefore the difference between the depth will be:
= -6 - (-22)
= -6 + 22
= 16
Therefore, the difference in depth is 16 feet
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The answers are:
1) 
2)
3) 
The explanation for this answer is shown below.
1. To solve this problem you must apply the following proccedure:
2. You have the function 
3. You must switch and 
and then solve for:
4. Finally, you obtain:
