book Maths Puzzle Numerical Ability

1)simplify root 5xy^5* root 10x^3
2) If f(2)=0 and f(x)=3x^2+kx-4, find k
3) if g(x)=3x^2+2x+6 and f(x)=4x-5, find g(2)/f(5)
4)if h(x)=13-5x,find h(x+5)

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book Other Question
how do you find the lcd of each equation find three consecutive integers such that the sum of the squares of the smaller two is equal to the square of the largest.