exam Maths Puzzle Numerical Ability

Can you please help me simplify -5^0 please? Thanks

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exam Other Question

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 Mary is 20 years old. She is twice as old as Ann was when Mary was as old as Ann is now. How old is Ann is now?