book Maths Puzzle Numerical Ability

what is the geometric mean of 5 and 15?

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book Other Question

(((((((Find the rationalroots of f. List any irrational roots correct to two decimal places f(x)=x^4-3x^3-4x^2=18x-12)))))))) if T =3ph +5 Find T when p =4 and h = 2