It is given in the question that
Emily’s last water bill listed a previous reading of 7,123 ccf and a present reading of 7,171 ccf. Her water company charges $0.73 per ccf of water.
Therefore number of ccf is

And company charges $0.73 per ccf.
So for 48 ccf, company charges

And that's the required answer .
Answer:
-3.649% or -0.0365
Step-by-step explanation:
A percentage can be converted to a decimal by moving the decimal point 2 places to the left.
-27.37% = -0.2737
Divide
-0.2737 / 7.5 = Answer
So to get a ratio of plates to bowl, you divide both the numbers by a common multiple, which I found the greatest to be 4. So you divide 52 by 4 and 24 by for to get a ratio of 13 plates to 6 bowls. (Also written as: 13:6, 13/6, or 13 to 6)
the diamiter is the two out side numbers minused by 3.14
For any equation,

assume solution of a form, 
Which leads to,

Simplify to,

Then find solutions,

For non repeated real root y, we have a form of,

Following up,
For two non repeated complex roots
where,

and,
the general solution has a form of,

Or in this case,

Now we just refine and get,

Hope this helps.
r3t40