Find the best linear least squares fit of the following data...

Find the best linear least squares fit of the following data using the indicated weights: (a) \begin{tabular}{c|cccc} $t_i$ & 1 & 2 & 3 & 4 \\ \hline$y_i$ & .2 & .4 & .7 & 1.2 \\ \hline$c_i$ & 1 & 2 & 3 & 4 \end{tabular} (c) \begin{tabular}{c|ccccc} $t_i$ & -2 & -1 & 0 & 1 & 2 \\ \hline$y_i$ & -5 & -3 & -2 & 0 & 3 \\ \hline$c_i$ & 2 & 1 & .5 & 1 & 2 \end{tabular} \begin{tabular}{c|cccccc} $x$ & 1 & 1 & 2 & 2 & 3 & 3 \\ \hline$y$ & 1 & 2 & 1 & 2 & 2 & 4 \\ \hline$z$ & 3 & 6 & 11 & -2 & 0 & 3 \end{tabular} (b) \begin{tabular}{c|cccc} $t_i$ & 0 & 1 & 3 & 6 \\ \hline$y_i$ & 2 & 3 & 7 & 12 \\ \hline$c_i$ & 4 & 3 & 2 & 1 \end{tabular} (d) \begin{tabular}{c|ccccc} $t_i$ & 1 & 2 & 3 & 4 & 5 \\ \hline$y_i$ & 2 & 1.3 & 1.1 & .8 & .2 \\ \hline$c_i$ & 5 & 4 & 3 & 2 & 1 \end{tabular}

Find the best linear least squares fit of the following data using the indicated weights:
(a)
\begin{tabular}{c|cccc}
$t_i$ & 1 & 2 & 3 & 4 \\
\hline$y_i$ & .2 & .4 & .7 & 1.2 \\
\hline$c_i$ & 1 & 2 & 3 & 4
\end{tabular}
(c)
\begin{tabular}{c|ccccc}
$t_i$ & -2 & -1 & 0 & 1 & 2 \\
\hline$y_i$ & -5 & -3 & -2 & 0 & 3 \\
\hline$c_i$ & 2 & 1 & .5 & 1 & 2
\end{tabular}
\begin{tabular}{c|cccccc}
$x$ & 1 & 1 & 2 & 2 & 3 & 3 \\
\hline$y$ & 1 & 2 & 1 & 2 & 2 & 4 \\
\hline$z$ & 3 & 6 & 11 & -2 & 0 & 3
\end{tabular}
(b)
\begin{tabular}{c|cccc}
$t_i$ & 0 & 1 & 3 & 6 \\
\hline$y_i$ & 2 & 3 & 7 & 12 \\
\hline$c_i$ & 4 & 3 & 2 & 1
\end{tabular}
(d)
\begin{tabular}{c|ccccc}
$t_i$ & 1 & 2 & 3 & 4 & 5 \\
\hline$y_i$ & 2 & 1.3 & 1.1 & .8 & .2 \\
\hline$c_i$ & 5 & 4 & 3 & 2 & 1
\end{tabular}

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