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 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 to find 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) = 0.4(t - 3)2 + 39.3
C. f(t) = 6.4(t - 3)2 + 39.3
D. f(t) = -0.23(t - 3)2 + 49.4
Answer: B
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A. 
B. 
C. 
D. 
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A. $1620.00 B. $162.00 C. $32.40 D. $324.00
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Evaluate the exponential expression. 421
A. undefined B. 1 C. 42 D. 0