I am failing this course MISERABLY and cannot get through this test review to save my life

Worse than that..

Question

I am failing this course MISERABLY and cannot get through this test review to save my life. Worse than that..

Once I get through that I have to take the actual test. They are both already late and I am desperate.

https://www.mathxl.com/Student/PlayerTest.aspx?testId=144058160centerwin=yes

a) Since { f ( x )= 4 x −3 ,if x ≤1
x+ 3 ,if x gt;1 Then f ( 1 )=4∗1−3=4−3=1 ( as x=1, f ( x )=4 x−3 )
f (−1 )=4∗(−1 ) −3=−4−3=−7
f ( 2 )=2+3=5 b) So, option (c) is…
Math