Answer
See the graph below:
Work Step by Step
Now we need to plug the coordinates we found in part a, which are
$$\left(x_A,y_A\right)=\rm\left(10.1\;km, 0.556\;km\right)$$
$$\left(x_B,y_B\right)=\rm\left(12.1\;km, 1.51\;km\right)$$
$$\left(x_C,y_C\right)=\rm\left(14.3\;km, 2.68\;km\right)$$
$$\left(x_D,y_D\right)=\rm\left(16.4\;km, 3.99\;km\right)$$
$$\left(x_E,y_E\right)=\rm\left(18.5\;km, 5.53\;km\right)$$
We can see these 5 dots in the figure below. Note that you can use any free- online- software calculator to plug these dots.
Also, note that the $y$-axis represents the height of the rock at some time $t=20\;\rm s$ while the $x$-axis represents the horizontal position from the collision point.
