exam Maths Puzzle Numerical Ability

I am not sure if I am in the right area of algebra. I need to know about precision and accuracy.
Example what is the precision and accursay for the following measurements
0.0524c

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exam Other Question

x(5.5-1.1)-(3.7 x 5)=120
how do i solve for x?
Find the minimum of P(x) = 3x^2 + 6x - 1.