Solve the system of equations.5x + 3y + z = 55x - 4y - z = -204x + y + 2z = -9
A. {(-1, -5, 5)}
B. {(-5, 5, -1)}
C. ?
D. {(-1, 5, -5)}
Answer: D
Mathematics
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Use a trigonometric substitution to evaluate the integral.
A. ln 6 - ln(1 + 
)
B. ln 
C. ln (e3 + 
)
D. ln(3 + 
) - ln(1 + 
)
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Use the rules for exponents to rewrite the expression and then evaluate the new expression. (-2)2(-2)3
A. -64
B. -32
C. 
D. 
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Simplify the expression. Express the answer so that all exponents are positive. Whenever an exponent is 0 or negative, we assume that the base is not 0.(2xy)2
A. 4xy
B. 2x2y2
C. 
D. 4x2y2
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Use the table of integrals or a computer or calculator with symbolic integration capabilities to find the integral. 
A. ln 
+ C
B. 
ln 
+ C
C. 
ln 
+ C
D. ln 
+ C
Mathematics