15. Name the function to show the legend on a plot.
16. Name the function to add ticks on axes.

Ans:
15
We can use legend() function to show the legend on the plot.
<matplotlib.pyplot>.legend(loc = <position number or string>)

16.
<matplotlib.pyplot>.xticks(<sequence containing tick data points>)
<matplotlib.pyplot>.yticks(<sequence containing tick data points>)