a)

AX	CF	M1	O/P
-7
		-7
0
	NB
			0

b)

AX	CF	M1	O/P
0
		0
0
	NB
			0

c)

AX	CF	M1	O/P
7
		7
0
	B
7
1
			1

General description: if I/P <= 0
                                    then O/P = 0
                                    else O/P = 1

(So, if I/P = -254, then O/P = 0,
    & if I/P = 32, then O/P = 1;
    try it!)
 

instruction        comment
=========        =======
IN         AX        I/P first integer
COPY    A, AX     store it in A
IN         AX         I/P 2nd integer
COPY     B, AX     store it in B
IN         AX         I/P 3rd integer
MUL      AX, B      multiply 3rd & 2nd integers
MUL      AX, A      multiply product of 3rd & 2nd
                           by the 1st integer
OUT      AX          O/P the result