$u=[1$:$2$:$9]7$

$v=[3$:$570,1]$:

$w=$ polyfit $(u,v,3)$

$x=1$ ength $(w)$

$3$

Error since $u$ and $v$ do not have same number of elements

$8$

$4$

$5$

r

b$)$ A$.$ Moving to another question will save this response.