book Maths Puzzle Numerical Ability

Chage the fraction 93/1000 to a decimal

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book Other Question

I'm really lost. Please help me. Here's the problem: f(x)=ax+b f(f(f(x)=8x+21 Find a and b.
Can you please explain triple functions and how to solve them relating to this problem? I'm not sure how to handle the radical in this quadriatic equation:

x^2 + x + sqrt(x^2 + x) - 2 = 0

In the provide examples, the duplicated x^2 + x can be substituted by some