Use Cramer's rule to solve the system. x + y + z + w = 7 3x - 2z + 5w = 11-4x + 3y + w = 4 -x - y - z - w = 6
A. 
B. 
C. 
D. Can't use Cramer's rule, D = 0
Answer: D
Mathematics
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A. < B. >
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Find the first term and the common difference for the arithmetic sequence. Round approximations to the nearest hundredth.a5= 15, a21= 95
A. a1= -5, d = 5 B. a1= 80, d = -5 C. a1= -5, d = 80 D. a1= 80, d = 5
Mathematics
Simplify.(6 + 5)[7 + (4 + 5)]
A. 74 B. 480 C. 176 D. 810
Mathematics
Find the linear factorization of the polynomial and find all roots of the polynomial. f(x) = 2x3 + 2x
A. f(x) = 2x(x + i)2, roots: 0, -i B. f(x) = x(x + 2i)(x - i), roots: 0, i, -2i C. f(x) = 2x(x + 1)2, roots: 0, -i D. f(x) = 2x(x + i)(x - i), roots: 0, ± i
Mathematics