The table shows the change in the water level (in centimeters) of a reservoir for three months. Find the total change in the wat
er level for the three-month period. Write your answer as a fraction or mixed number in simplest form.
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The function has a maximum at (1, 3).
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_____
You know it is not a minimum because the coefficient of the squared term is negative.
You know the vertex is (1, 3) because you match the pattern to
.. y = a(x -h)^2 +k
which has its vertex at (h, k).