The domain of the function are {0.8,1.2,2}
Answer:
(D) 
Step-by-step Explanation:
Assuming that the equation
= p, we can convert the equation into this.

We can convert
into 9p because
× 9 = 
Now we simplify this equation.
We can subtract 9p from both sides of the equation.

Re-ordering the equation gets us:

So, (D)
is equivalent to the original expression of
The midpoint is the average of the coordinates of the endpoints.
M = (A + B)/2 = ((1+7)/2, (3+8)/2) = (4, 11/2)
The midpoint of AB is (4, 11/2).
6/4 simplifies down to 3/2 by halfing 6 and 4