Answer:
C. For every blueberry muffin, there are two chocolate chip muffins
Step-by-step explanation:
Blueberry : Chocolate
1 : 2
x9
9 : 18
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For a non-resident:

For a resident:

We want to know the number of days
such that the two costs are equal ie 
To do this set the two costs equal to each other:


And solve for d:




The costs will be equal when a resident and a non-resident each use the beach for 12 days.
(5 x 12) ÷ 2 = 30 (area of triangle)
40 x 12 = 480 (area of rectangle)
12 ÷ 2 = 6 (radius of semicircle)
3.14 x 6^2 = 3.14 x 36 = 113.04
113.04 ÷ 2 = 56.52 (area of semicircle)
30 + 480 + 56.52 = 566.52 square feet
The general form of quadratic formula is,
(text didn't allow + and - together)
Therefore, the answer is option C
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