exam Maths Puzzle Numerical Ability

how do u do this 10 to the negative 2nd power?

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I need to know the answer to: 2m-(m-n)-(y+2z)+(3a+b) if a=1,b=2,m=7,n=8,y=5 and z=6 find the point of intersction forthe line below using elimation 2x+3y=6, -2x+y=10