Evaluate: 
Mathematics
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Use the determinant feature of a graphing calculator to solve the system by Cramer's rule . (Round to one decimal place.)1.5x + 3.1y - 2.3z + 0.6w = 2.76.1x - 0.5z - 3.4w = 0.811.5y - 2.2w = 04.0x + 3.0y - 2.1z = 9
A. {(4.3, 1.3, 4.9, 6.7)} B. {(7.9, 2.4, 9.0, 12.3)} C. {(3.6, 1.1, 4.1, 5.6)} D. {(3.2, 1.0, 3.7, 5.0)}
Mathematics
Simplify.(-3x4y)(9x4y5)
A. -27x16y5 B. 27x8y4 C. 27x16y5 D. -27x8y6
Mathematics
Write the phrase as a variable expression. Use x for the unknown number.The difference of -5 and twice a number
A. -5 + 2x B. -5 - 2x C. 2(-5 - x) D. 2x + 5
Mathematics
Find the real or imaginary solutions by completing the square.x2 + 4x + 8 = 0
A. {2 ± 2i}
B. {-2 ± 2i}
C. {0, -4}
D. {-2 ± 2
}
Mathematics