Solve the system of equations.x - y + 5z = -16-5x + 5y - 25z = -4x + 3y + z = 8
A. {(-4, 0, 4)}
B. {(-4, 4, 0)}
C. {(0, 4, -4)}
D. ?
Answer: D
Mathematics
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Find a polar equation in the form r cos(? - ?0) = r0 for the given line.x - 
y = 10
A. r cos 
= 10
B. r cos 
= 5
C. r cos 
= 5
D. r cos 
= 10
Mathematics
Find the area of the shaded region.
A. 2
B. 2 - 
C. 2 + ?
D. 2 + 
Mathematics
Find each product.(n - 13)(n + 13)
A. n2 - 26n - 169 B. n2 - 26n + 169 C. n2 - 26 D. n2 - 169
Mathematics
Express the number in decimal notation.8.1 × 105
A. 81,000 B. 8,100,000 C. 405 D. 810,000
Mathematics