exam Maths Puzzle Numerical Ability

solve for r
c=2x3.14xr

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exam Other Question

A common mistake when solving equations is the following:
The equation: 2(x - 2) = x + 3
First step in solving: 2x - 2 = x + 3 Hi!
The question for this is: for the function f(x)= x^2 -2x+1

a)find f(0)

b) solve f(x)=0

Please and Thank You=)