Exercise $1.$ Let $r=0\mathrm{.}3.$ Identify the inflow and outflow terms and save them as separate math functions. Plot these functions on the same set of axes, making sure to add axes labels, legend labels, and unique colors to allow the inflow and outflow graphs to be easily identified. Plot both functions for values of $x$ from $0$ to $3\mathrm{.}5.$ Note that since $x$ is a concentration it cannot be negative.

Exercise $2.$ Repeat Exercise $1$ but set $r=0\mathrm{.}6.$

Exercise $3.$ Modify your code from Exercise $2$ to turn it into an interactive that allows the user to vary the value of $r$ from $0\mathrm{.}3$ to $0\mathrm{.}6.$ Use ymin$=0$ and ymax $=1\mathrm{.}5$ options in the plot function to fix the bounds for the $y$ axis so that does not change when you change the value of $r.$