Please help me with calculus!! Thank you

Question

1. The table below shows the temperature (in °F) t hours after midnight in Phoenix on March 15. The table shows values of this function recorded every two hours. (10 points)Estimate the value of T'(6). Give units in your answer.
2. What is the meaning of T'(6)?

t 0 2 4 6 8 10 12 14

T 73 73 70 68 73 80 86 89

Answer 1

T '(6) is either +/ or *- a second time.

6t: add 1 to the power then put it under the 6;

or 0: multiply the power by the digit then subtract 1 from the power.

Since there's no power; 6*0=0.