Simplify.9x - {3[4(4x - 6) - (9x + 8)] + 20}
A. -66x + 28
B. -12x - 28
C. -66x + 68
D. -12x + 76
Answer: D
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Multiply.(3m2z4)(2m2z2)
A. 6m4z6 B. 6mz6 C. 6mz4 D. 6m4z
Change to an improper fraction.4
A. 
B. 
C. 
D. 
Describe the mail-time situation that illustrates the computation, and state the answer.60 - 110
A. The mail carrier brings you a check for $60 and takes away a check for $110; 60 - 110 = -50 B. The mail carrier brings you a bill for $60 and takes away a check for $110; -60 - 110 = -170 C. The mail carrier brings you a bill for $60 and a check for $110; -60 + 110 = 50 D. The mail carrier brings you a check for $60 and a check for $110; 60 + 110 = 170
Solve the following system by any appropriate method. If there is no real number solution, so state.x2 + 6y2 = 7x2 - y2 = 1
A. 
, 
, 
, 
B. 
, 
, 
, 
C. 
, 
, 
, 
D. no real solution