exam Maths Puzzle Numerical Ability

Use the Gauss-Jordan method to solve each system of equations.
4x-3y+z+w=21
-2x-y+2z+7w=2
10x-0+5z-20w=15

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exam Other Question

Decrease in Banks The number of banks in the United
States has dropped about 30% since 1992. The following
data are from a survey in which x represents the years
since 1900 and Can you please help me simplify -5^0 please? Thanks