exam Maths Puzzle Numerical Ability

please help me with these problems:

what is the square roots of 128 and 80?

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exam Other Question

21 ___ ___63___ ___ I am told that there is a strategy for finding missing numbers on a number line when the numbers are the same distance apart. I am helping my son with his home work and i need your help Please find X and Y: 2X+3Y=16, 5X+3Y=44

Please show work (explain process). Thanks