Solve the system by substitution. If the system is inconsistent or has dependent equations, say so.
x + 
y = 4
x - 2y = 21
A. {(-6, -8)}
B. {(6, 8)}
C. {(6, -8)}
D. {(-6, 8)}
Answer: C
Mathematics
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Factor by grouping.m3 + 3m2p2 - 6mp - 18p3
A. (m + 3p2)(m3 - 6p) B. (m + 3p2)(m2 - 6p) C. (m2 + 3p2)(m - 6p) D. (m - 3p2)(m2 - 6p)
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Solve.3x = 
A. 4
B. -4
C. 
D. 
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Find the slope of the line containing the two points.(-9, 3); (-9, 1)
A. 
B. -2
C. 0
D. undefined
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Multiply.(0.8x - 0.2)2
A. 0.64x2 + 0.32x + 0.04 B. 0.64x2 - 0.32x + 0.04 C. 0.64x2 + 0.04 D. 0.64x2 + 0.32x - 0.04
Mathematics