exam Maths Puzzle Numerical Ability

What is the sum of the first 50 natural numbers?

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exam Other Question

solve the equation for x

25x^2=13
I need to simplify this expression, and I have gotten I think 1/2 way, however I am not sure.

SQ RT 63- -2 SQ RT28+ 5 SQ RT7
SQ RT 63- =SQ RT 9x5 = SQ RT 3x5
so,
how do I br