I think that the answer is A.
Answer:
Sarah is correct
Step-by-step explanation:
Required
Which of the students is correct
Let a number be x,
Given what the teacher asked the students to do, the solution is:



Only Sarah got this correctly; others are incorrect.
The proof is as follows.
For Sarah



So, the numbers will be: 1416, -1416 and 1416
<em>Other students are incorrect</em>
Answer:
-5
Step-by-step explanation:
The y coordinate of the vertex is -5.