It says it wants me to make a scatter plot, then these are the questions I'm stuck on:

4."Draw a line of best fit and a polynomial of best fit.Record the equations and r-squared values on the graphs.Calculate the r value if appropriate.

Compare your graphs and make conclusions:"

5."Use your polynomial equation to predict the global land-ocean temperature (to 4 decimal places) if the global CO2 emissions were 15000 MMT.Hint: The symbol "E" represents scientific notation.For example, 3E-05 means 3X10-5, or 0.00003 (it moved 5 decimal places to the left).Show your work:"

I do not know what a polynomial of best fit is, can anyone help me with these questions?