Given that f(x) = 2x + 11: if f(x) = y = 21, then 21 = 2x + 11, and so 10=2x and x=5.
Thus, f(5) = 2(5) + 11 = 21; (5,21) is a point on the graph of f(x).
If that is so (which it is), then (21,5) is a point on the graph of the inverse function, and 5 is the appropriate output value.
Answer:
For this case we know that the total distance to travel is 325 mi. And we know that Aretha travels at the following velocity:

Then we can use the following definition:

Where D is the distance and V the velocity. And solving for t we got:

And replacing we got:

So then we can conclude that after 5 hours at this rate Aretha will arrive to home
Step-by-step explanation:
For this case we know that the total distance to travel is 325 mi. And we know that Aretha travels at the following velocity:

Then we can use the following definition:

Where D is the distance and V the velocity. And solving for t we got:

And replacing we got:

So then we can conclude that after 5 hours at this rate Aretha will arrive to home
-6+2y by multiplying-2 to 3 and -y :))