Find the opposite of the number.-25
A. 25
B. 0
C. -25
D. -1
Answer: A
Mathematics
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Solve by the substitution method.x + 2y = -5-7x + 3y = 35
A. {(5, -1)} B. {(x, y)|x + 2y = -5} C. {(-5, 0)} D. ?
Mathematics
Simplify the expression by using the order of operations.42 ÷ 7 ? (15 - 10)
A. 100 B. 80 C. 30 D. 150
Mathematics
The augmented matrix is given for a system of equations. If the system is consistent, find the general solution. Otherwise state that there is no solution. 
A. x1 = -7 - 4x2 - 5x4 x2 is free x3 = -4 - 4x4 x4 is free B. x1 = -7 - 4x2 - 5x3 x2 = -4 - 4x3 x3 is free C. x1 = - 4x2 +2x3 + 3 x4 + 1 x2 is free x3 = -4 - 4x4 x4 is free D. x1 = -7 - 4x2 - 5x4 x2 is free x3 = -4 - 4x4 x4 = 0
Mathematics
Divide.
A. -31
B. -21
C. - 
D. 21
Mathematics