Solve the system of equations using Gaussian Elimination method.

x + y + z - t = 4

2x - y + 2z + 3t = - 8

-x + 2y - 3z + t = 4

3x + y + 2z - 3t = 9

What is the simplest form of 4 12/20

Is - 10 a rational number or irrational number

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Which expression does not represent "the sum of n and 6"? O6 + n On + 6 O on

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Find two consexutive odd integers such that the sum of their square is 650

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How many times will 1/4 go into 6 7/10