Evaluate the expression for x = -2, y = 3, z = -4.23 - z2

A. 7
B. 31
C. 184
D. 39

Answer: A

Mathematics

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Simplify the expression. Write the answer using positive exponents.

A.
B. 4r-5
C. 4r5
D. 4

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Solve the system using Gaussian elimination.-5x -  y - 5z = -68-8x + 4y + 6z =  34-7x - 9y +  z = -46

A. {(4, 3, 9)} B. {(-4, 3, 8)} C. {(4, 9, 3)} D. ?

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Substitute the value(s) for the variable(s) and then evaluate.(19 - w)u ? 4.6; w = 13, u = 2

A. 165.6 B. 55.2 C. 358.8 D. 78.8

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Find the domain of the function.

A. {x|x ? 0} B. {0} C. all real numbers D. {x|x ? 0}

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