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\begin{tabular}{|c|c|}
\hline Time (Weeks) & Returns Filed (Millions) \\
\hline 2 & 39.75 \\
\hline 3 & 49.92 \\
\hline 5 & 67.72 \\
\hline 7 & 84.08 \\
\hline 10 & 119.43 \\
\hline 11 & 137.23 \\
\hline 13 & 141 \\
\hline 14 & 141.57 \\
\hline
\end{tabular}

The table includes weekly data collected by the Internal Revenue Service. Complete the sentences about a model if [tex]$x$[/tex] is the time, in weeks, since February 2019, and [tex]$y$[/tex] is the cumulative number of returns filed.

The value of [tex]$a$[/tex] is [tex]$\square$[/tex].

The value of [tex]$b$[/tex] is [tex]$\square$[/tex], and the value of [tex]$c$[/tex] is [tex]$\square$[/tex].


Sagot :

To determine the values of the coefficients for the quadratic model [tex]\( y = ax^2 + bx + c \)[/tex] that best fits the given data, we begin with the following data points:

[tex]\[ \begin{tabular}{|c|c|} \hline Time (Weeks) & Returns Filed (Millions) \\ \hline 2 & 39.75 \\ \hline 3 & 49.92 \\ \hline 5 & 67.72 \\ \hline 7 & 84.08 \\ \hline 10 & 119.43 \\ \hline 11 & 137.23 \\ \hline 13 & 141 \\ \hline 14 & 141.57 \\ \hline \end{tabular} \][/tex]

Fitting these data points to a quadratic function of the form [tex]\( y = ax^2 + bx + c \)[/tex], we obtain the coefficients for [tex]\( a \)[/tex], [tex]\( b \)[/tex], and [tex]\( c \)[/tex].

The specific values for these coefficients are:
- The value of [tex]\( a \)[/tex] is [tex]\( -0.24498881831119262 \)[/tex]
- The value of [tex]\( b \)[/tex] is [tex]\( 13.09543454869118 \)[/tex]
- The value of [tex]\( c \)[/tex] is [tex]\( 11.796778632313286 \)[/tex]

Thus, the sentences can be completed as follows:

The value of [tex]\( a \)[/tex] is [tex]\(-0.24498881831119262\)[/tex], the value of [tex]\( b \)[/tex] is [tex]\(13.09543454869118\)[/tex], and the value of [tex]\( c \)[/tex] is [tex]\(11.796778632313286\)[/tex].