exam Maths Puzzle Numerical Ability

(a^3/b^2)^4=

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exam Other Question

IM trying to slove radical equations, and I have no idea how to do it?

1. x= radical sign with 2x+8 in it?

2. radical sign with 3x+4+5 = 3

3. The area of a circle is about 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?