I'll use subscript notation for brevity, i.e.
.
By the chain rule,



We have

and

When
, we have

and the partial derivatives take on values of

So we end up with

Answer:
A. If we consider two right triangles one Δ ABD and Δ BCE, where D(2,100) and E(1,60) points
B. From the graph, it is clear that the initial value of the graph is 60 m and it represents the initial position of the shark i.e. at t = 0 min, the shark was at a depth of 60 m from the water surface.
The slope of the graph is 40 means the rate of change of distance from the Ocean surface of the shark with respect to time in minutes will be 40 m per min.
Step-by-step explanation:
Hi!
I'm 90% sure that the answer is: <em>5</em>
Sorry its its wrong!
Hope this helps!
Let me know if you need anymore help!
<em>Yours truly,</em>
<h2><em>
~~~PicklePoppers~~~</em></h2>
6:30
- :20
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6:10
- :15
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5:55
- 1:
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4:55
- :45
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4:10 was when he started history