Simplify the expression so that it contains only positive exponents 
.
?
?
A. 
B. 
C. 
D. 
E. 
Answer: A
Mathematics
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Solve the system of equations by Gaussian elimination. If there is an unlimited number of solutions, find two of them.-3x - y - 9z = -21 2x + 9y - 4z = 79 6x - 2y + z = -11
A. Inconsistent B. x = 1, y = 1, z = 9 C. Unlimited: x = 1, y = 9, z = 1, x = 1, y = 1, z = 9 D. x = 1, y = 9, z = 1
Mathematics
Multiply.(7n2 + 8)(7n2 - 8)
A. 49n4 - 64 B. 49n4 - 56n2 - 64 C. 49n4 + 64 D. 7n4 - 64
Mathematics
Use the unit circle to find the value of the trigonometric function.cot 
A. 1 B. undefined C. -1 D. 0
Mathematics
Supply the missing numbers. Round decimals to the nearest thousandth and percents to the nearest tenth of a percent.fractiondecimalpercent
A. 0.676 67.6% B. 0.556 5.56% C. 0.676 676% D. 0.556 55.6%
Mathematics