Add the rational expressions: 
a. 
b. 
c. 
d. 
b.
Mathematics
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Solve.5x + 2y + z = -112x - 3y - z = 177x + y + 2z = -4
A. (-3, 0, 4) B. (3, 0, -4) C. (0, 6, -1) D. (0, -6, 1)
Mathematics
If ?ABC ? ?XYZ and ?XYZ ? ?RST, then
(a) ?ABC ? ?RST. (b) ?XYZ ? ?RST. (c) AB ? XY . (d) All of these are valid conclusions. (e) Both (b) and (c) are correct.
Mathematics
Divide.9 ÷ 
A. 21
B. - 
C. -21
D. -3
Mathematics
Multiply and simplify.
? 
A. 
B. 
C. 
D. 
Mathematics