$($b$)(4$ points$)$ Are the vectors

u$1=$

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$3$

$8$

$7$

$3$

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$$

$,$ u$2=$

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$$

$$

$$

$1$

$5$

$3$

$1$

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$$

$$

$,$ u$3=$

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$$

$$

$2$

$1$

$2$

$6$

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$$

$,$ u$4=$

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$$

$$

$$

$1$

$4$

$0$

$3$

$$

$$

$$

$.$

linearly independent?