exam Maths Puzzle Numerical Ability

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

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exam Other Question

give a counter example that demonstrates that the converse of the statement is false.

if an angle measures 94 degrees then it is obtuse how do u do this 10 to the negative 2nd power?