Error analysis Luke

Diagnostic Test 2 Q 4 (c)
QD
Nature of errors:Careless
Error:
Line 1:
2 x 2 - 16 x -1/2 x -1/2=0
Line 2:
2 x 2 - 16 x 4= -60 

Diagnostic Test 2 Q 4 (c)
QE
Nature of errors:Conceptual 
Error:
Line 1:
22 - 18 - 16 (0.25)=-3

Diagnostic Test 2 Q 4 (c)
QF
Nature of errors:Conceptual 
Error:
Line 1:
22 - 18 - 16 x -1/2 x -1/2 =4

Diagnostic Test 2 Q 4 (d)
QA
Nature of errors:Careless
Error:
Line 2:
-1/2 / 1/6 = -3

Diagnostic Test 2 Q 4 (d)
QB
Nature of errors:Carless
Error:
Line 3:
-1/2 x 6/1 = -3

Diagnostic Test 2 Q 4 (d)
QC
Nature of errors:Careless 
Error:
Line 1:
-1/2 / 1/6 = -3
Line 3:
-18/12 /11/12 = -1 7/11 

Diagnostic Test 2 Q 4 (d)
QD
Nature of errors:Conceptual 
Error:
Line 1:
-1/2 / 1/3 x 1/2
Line 4:
-1/2 x 6/1 

Diagnostic Test 2 Q 4 (d)
QE
Nature of errors:Careless 
Error:
Line 3:
-0.5/0.5/3 = -3