exam Maths Puzzle Numerical Ability

Simplify:

3 sq root 32 - 5 sq root 50 - 8 sq root 45 + 7 sq root 20

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exam Other Question

if x+2y+3z=53 and 3x+2y+z=52 what is the value of x+y+z? State the domain of the following:
m(x)=5/x^2+9