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exam Maths Puzzle Numerical Ability

simplify:

square root 5^2/2x10^2
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5

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exam Other Question

-2(3y-)=56
Help!!!
Need to find altitude (height) of an obtuse triangle.
Legs are 10 & 17 and base is 21.
They have drawn in an altitude line which forms a right angle
It is from the textbook Geom