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1. 
(2x+3y+5z) + (5x-8y-3y) - (7x-5y+2z)=
A.
0
B.
14x -10y +4z
C.
7x - 5y + 2z
D.
-2x - 3y - 5z
2. 
-(4a-2b+7c) + (8a+9b+10c) =
A.
4a -11b - 17c
B.
4a + 11b + 3c
C.
4a + 11b - 17c
D.
4a - 11b + 17c
3. 
3(2x+3y-z) - 2(x+y+3z)
A.
4x - 7y + 9z
B.
4x + 7y + 9z
C.
4x - 7y - 9z
D.
4x + 7y - 9z
4. 
[1/(x + 1)] + [1/(x - 1)]
A.
x / (x^2 - 1)
B.
x / (x^2 + 1)
C.
(x - 1) / (x^2 - 1)
D.
(x - 1) / (x^2 + 1)
5. 
[3x(x - 3)^2] / [9x^2(x - 3)]
A.
-(x - 3)/3x
B.
(x - 3)/3x
C.
(x + 3)/3x
D.
(x - 1)/x
6. 
[4x / x-2] ÷ [x^2 / x+4]
A.
(x + 4)/ (x^2 - 2x)
B.
(x + 4)/ (x^2 + 2x)
C.
(x + 4)/ 4(x^2 - 2x)
D.
(x + 4)/ 4(x^2 + 2x)
7. 
(7x+2y)-(4x-3y)
A.
3x-5y
B.
5x+3y
C.
3x+5y
D.
5x-3y
8. 
(4a^2 - 7ab)(2a^3b)
A.
8a^2b - 14a^3b^2
B.
8a^5b + 14a^4b^2
C.
8a^2b + 14a^3b^2
D.
8a^5b - 14a^4b^2
9. 
(-3/4a^2b - 6b^3 + 2a^3 - 1/2ab^2) - (-1/3a^3 - 2b^3 + 1/3a^2b - ab^2)
A.
13a^2b - 4b^3 + 5/3a^3 + 1/2ab^2
B.
-13a^2b + 4b^3 + 5/3a^3 + 1/2ab^2
C.
-13a^2b - 4b^3 + 5/3a^3 - 1/2ab^2
D.
-13/12 a^2b - 4b^3 + 7/3a^3 + 1/2ab^2