Astudent took a test which had 6 questions. he would score 8 points on the test if all his answers are correct. if y represents the student's score when he got x questions incorrect, which graph best represents this situation? graph of line going through ordered pairs 0, 8 and 6, 0 graph of line going through ordered pairs negative 6, 0 and 0, 8 graph of line going through ordered pairs 0, negative 6 and 8, 0 graph of line going through ordered pairs 0, 6 and 8, 0

Given:
A student took a test which had 6 questions. He would score 8 points on the test if all his answers are correct.
If y represents the student's score when he got x questions incorrect, which graph best represents this situation? 

Perfect score: 8 points for 6 correct answers. Incorrect = x = 0 → (0,8)
0 score if incorrect answer is 6. x = 6  → (6,0) 

Answer is: graph of line going through ordered pairs 0, 8 and 6, 0 

x represents the number or incorrect answer
y represents the total score of the test

Option B. 49.5 degrees

Step-by-step explanation:

Given that arc QS measures 4x-18

Arc QS is a semicircle and hence subtended angle by semicircle at the centre is 180 degrees.

Use this to find the value of x

4x-18 = 180 degrees

Add 18 to both sides

4x=198

Divide by 4

x =198/4 =49.5

So answer is option B

49.5 degrees