Answer:
x=-3
Step-by-step explanation:
I have a formula
2.09/12 = 0.174...rounds to 17 cents per oz
3.09/20 = 0.154..rounds to 15 cents per oz
<h3>
Hello!</h3>

In order to find the vertex of a parabola, we use the following formula:

Remember, a parabola looks like so:

Now we know what a and b stand for.
In this case, b is -4, and a is -1:

Simplify:

Divide:


<h3>Notes:</h3>
- Hope everything is clear.
- Let me know if you have any questions!
- Enjoy your day!
- Always remember: Knowledge is power!
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