exam Maths Puzzle Numerical Ability

sqrt 5x2 + 3 sqrt 20x2 +7 sqrt 20x2

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exam Other Question

how so you simplify 3.54 x 10^9/6.15 x 10^-5 then write it in scientific notation? Solve the equation: x� + 3x - 54 = 0

I cant do this at all :[