exam Maths Puzzle Numerical Ability

What is the diagonal of a square if its perimeter is 24cm? Can you show me how to figure this out?

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exam Other Question

Can someone help me on this problem?

I need t solve the system by addition:

x + y = 6
x - y = 4

Thank you,
Lisa If the circle with centre(0,m) has equation x^2+y^2+6y+5=0, what is the value of m?