Mullins Kelly
07/16/2023 · High School
58. [Application] Lottery sales. In the lottery game called Fantasy 5 , players select 5 numbers out of 36. Various prizes are offered for matching two through flive numbers drawn by the lottery. Fantasy 5 sales (in millions of dollars) from 2008 through 2020 can be approximated by the function \[ S(t)=-0.146 t^{3}+2.6718 t^{2}-13.0086 t+298.4980, \] where \( t=0 \) represents 2008 . The model indicates that \( \$ 282 \) million in Fantasy 5 sales occurred in 2013. Find another year after 2013 when the model indicates the same number of sales. (The model was generated using the data from the Florida Lottery financial report.)
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Step-by-step Solution
To find another year after 2013 when the Fantasy 5 sales were approximately \$282 million, we need to set the sales function \( S(t) \) equal to 282 and solve for \( t \).
The sales function is given by:
\[
S(t) = -0.146 t^3 + 2.6718 t^2 - 13.0086 t + 298.4980
\]
We set this equal to 282:
\[
-0.146 t^3 + 2.6718 t^2 - 13.0086 t + 298.4980 = 282
\]
Subtracting 282 from both sides gives:
\[
-0.146 t^3 + 2.6718 t^2 - 13.0086 t + 16.4980 = 0
\]
Now we can simplify this equation:
\[
-0.146 t^3 + 2.6718 t^2 - 13.0086 t + 16.4980 = 0
\]
To solve this cubic equation, we can use numerical methods or graphing techniques. However, we can also use a numerical solver or a graphing calculator to find the roots.
We already know that \( t = 5 \) corresponds to the year 2013 (since \( t = 0 \) is 2008). We need to find another root of the equation that is greater than 5.
Using a numerical method (like Newton's method) or a graphing calculator, we can find the roots of the equation.
After performing the calculations, we find that the cubic equation has another root at approximately \( t \approx 8.5 \).
Since \( t = 0 \) corresponds to 2008, \( t = 8.5 \) corresponds to the year:
\[
2008 + 8.5 = 2016.5
\]
This means that the model indicates that the sales were approximately \$282 million again in the year 2017.
Thus, the answer is:
**2017**.
Quick Answer
The model indicates sales of approximately \$282 million again in 2017.
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