Since TSQ and QSR are supplementary, they give 180 when summed. TSQ is 150, so QSR must be 30.
Therefore, you have

A, 39
You can get the average score by adding up all the total scores, (33, 41, 33, 45 and 43) and dividing that by the total number of scores, 5. 195 (total score)/5 (number of scores)= 39.
Hi.
The answer is:
<em />b. c(x) = 2.00 + 0.50<em>x</em>
Cheers~
Your answer is D
hope this helps