Write the matlab code that will produce the following $(20$ points$)$

Create a column vector $x$ with $90$ elements such that the first $50$ elements are the integers from $1$ to $50,$ and the rest are ones

plot the functions $f(x)=x^2($in blue$)$ and $f(x)=\sqrt[\phantom{2}]{x}($in red$)$ on the same figure with the title 'power functions' using the domain from $0$ to $9$ incremented by $0\mathrm{.}01$

For the $mn$ matrix $A$

$($a$)$ multiply the first row by the correct number to make $a_{11}=1$

$($b$)$ Add the correct multiple of the new first row of $A$ to row two to make $a_{21}=0$