The area of the square is given by the quadratic expression:

<h3 /><h3>How to express the area of the given square?</h3>
If we have a square whose side measures S, the area of said square is given by the equation:

In this case, we know that the side length of our square is given by:

Replacing that in the area equation we get:

Now we just need to expand that product, we will get:

Then we can see that the correct option is the last one.
If you want to learn more about squares you can read:
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Answer:
Step-by-step explanation:
<u>z is directly proportional to x</u>
- z = kx, where k is coefficient
If z = 12 when x = 3
<u>Then we have</u>
So the coefficient is 4
<u>When z = 18, we have</u>
85 gallons per day is the unit rate. divide 2550 by 30