The same as my previous comment. During lecture you highlighted that in the table below the formula should be divided by 144 so we get our ba or Basal area in square feet.

(typo and , ) below that you mentioned during lecture. It is in the table below this sentence. I did not see the typo that you mentioned but after Tree_id = id there is meant to be a comma.

can be found at? I'm assuming this is meant to direct us to the work of the previously listed authors. Also it is at (space) period.

Additional word typed, and is a typo regardless. Hope this helps