exam Maths Puzzle Numerical Ability

the square root of 2x plus three minus the square root ofx plus one equals one

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the noraml adults dose of cod liver oil is 25ml. according to the formula, [c=a/a+10*N], what dose should each of these children aged 2, 5, 10 and 13 take? f(x)=7x+2 find f(x) when x=0 and when x=1