Solve the system of equations. x + y + z = 7 x - y + 2z = 75x + y + z = 11
A. (1, 4, 2)
B. (4, 1, 2)
C. (1, 2, 4)
D. (4, 2, 1)
Answer: C
Mathematics
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Use the method suggested to compute mentally.Use front-end multiplying. 
A. 540 B. 539 C. 542 D. 541
Mathematics
Simplify the expression using the imaginary unit i.
A. -6i
B. 6i
C. i
D. ±6
Mathematics
Find the sum, sn, of the sequence.a1 = 3, d = 4; find s65
A. 8384 B. 8515 C. 8645 D. 7980
Mathematics
Simplify the expression.
A. already in lowest terms B. -m C. -1 D. 1
Mathematics