Solve the problem.The table shows the number of new cases (in thousands) of a certain disease diagnosed in a country in various years. 
Let n = f(t) be the number of new cases (in thousands) of the disease diagnosed at t years since 2010. Find a quadratic equation for f in vertex form. Use the data for the year 2013 as the vertex and use the data for the year 2017 to find the value of a.
A. f(t) = 0.71(t - 4)2 + 39.3
B. f(t) = -0.23(t - 3)2 + 49.4
C. f(t) = 0.4(t - 3)2 + 39.3
D. f(t) = 6.4(t - 3)2 + 39.3
Answer: C
Mathematics
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