Solve the system.2x + 4y + 8z = 168 x + 2y + 4z = -28 x + y + z = -6
A. (-5, -2, -6)
B. (-6, -5, -2)
C. (-6, -2, -5)
D. No solution
Answer: D
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Perform the indicated operation.(-7x3 - 7x2 + 7x - 7) + (-6x3 + 9x - 3)
A. -6x3 + 2x2 + 4x - 7 B. -13x3 + 16x - 10 C. -13x3 - 7x2 + 16x - 10 D. -13x3 + 2x2 - 3x - 7
Solve the inequality. Write the solution set in interval notation.
? 0
A. [-2, 2] ? [6, ?) B. (-2, 2) ? [6, ?) C. (-?, 2) ? [6, ?) D. (-2, 6]
Simplify the expression. Write your answer without negative exponents. Whenever an exponent is negative or zero, assume that the base is not zero.(x4)-3
A. 
B. -3x12
C. - x12
D. -3x4
Solve the problem.The number of turns N required in a solenoid of length l (in m) is given by N = 
,where L represents inductance (in appropriate units), ? is a constant, and A represents cross-sectional area (in square meters). If 
and 
-4.0px;" /> find the number of turns required, to the nearest whole turn.
A. 5700 turns
B. 700 turns
C. 488,000 turns
D. 11 turns