Calculus - functions, method of Least Squares

Please ONLY answer questions 1, 4a, 4b, 4c, 4d, 6a, 6b and 6c. 

Please also show as much working out as possible, thank you!

Answer

Answers can be viewed only if
  1. The questioner was satisfied and accepted the answer, or
  2. The answer was disputed, but the judge evaluated it as 100% correct.
View the answer

1 Attachment

The answer is accepted.