9mph because 20 minutes time 3 is one hour so multiply 3 by 3 to get 9
Answer:

Step-by-step explanation:

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This may be the right answer: x=-1 y=-11/5
ANSWER
-2 shift the graph of the basic function down by 2 units.
EXPLANATION
The given cosine function is:

This equation can be rewritten as:

We compare this to

The effect d has on the graph is that, it shifts the graph up by d units.
If d is negative the graph shifts down by d units.
Since d=-2, the graph will shift down by 2 units.
26.2/210= .125 miles per minute
210/26.2= 8.02 minutes per mile