$.$ Use MATLAB to evaluate the logistic equation $($Equation $1\mathrm{.}10)$ for four different values of r: $1\mathrm{.}25,2\mathrm{.}25,3\mathrm{.}2,$ and $3\mathrm{.}6.$ Evaluate the first $50$ generations $($use a for loop to increment n from $1$ to $50)$ and start with an initial value for x of $0\mathrm{.}02.$ Plot the population x as a function of generation, n$.$ Use subplot to put the four plots together. Label the plots appropriately.