Question 1146849
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(1) Graph the equation on a graphing calculator.<br>
(2) Find the maximum value of the function, and the x value which produces that maximum.  1992 plus the x value is the year in which the interest rate is highest.<br>
(3) Evaluate the function for x = 18 (2010 is 18 years after 1992).  The function value is negative there.  Is that reasonable?<br>
Note that the problem says the given function is only applicable for the years 1992-2007; so using it to estimate the interest rate in 2010 might not be valid.  However, even for the year 2007 (x=15), the function value is negative; so the function is not realistic.