<table style="margin: auto; text-align: center;" border="1">
<tbody>
<tr>
<th>$x$</th>
<th>$f(x)$</th>
</tr>
<tr>
<td>1</td>
<td>5</td>
</tr>
<tr>
<td>3</td>
<td>13</td>
</tr>
<tr>
<td>5</td>
<td>21</td>
</tr>
</tbody>
</table>
<p>&nbsp;</p>
<h5>Some values of the linear function $f$ are shown in the table above. Which of the following defines $f$?</h5>

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Mashaal Masha

Some values of the linear function $f$ are shown in the table above. Which of the following defines $f$?

$x$	$f(x)$
1	5
3	13
5	21

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Mashaal Masha

Some values of the linear function $f$ are shown in the table above. Which of the following defines $f$?