Hello! The answer to this question is: A = -2
Answer:

Step-by-step explanation:
Given
-- degree of freedom

Required
Determine the t-value
The given parameters can be illustrated as follows:

Where

So, we have:

To solve further, we make use of the attached the student's t distribution table.
From the attached table,
The t-value is given at the row with df = 28 and
is 3.673900
Hence, 
The coefficient of X is -2
Answer:
This answer is A
Step-by-step explanation:
your welcome, im fast to answer
I think it might be C but please wait for someone else to comment to confirm my answer :) have a beautiful day you are loved