exam Maths Puzzle Numerical Ability

SOMEONE HELP ME PLEASE:
From the information in the table providing values of f(x) and g(x), evaluate (f O g)^-1(3).

x 1 2 3 4 5
f(x) 5 3 5 1 2
g(x) 4 5 1 3 2

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exam Other Question

Trouble with this problem

For the equation x - sqrt x = 0 , perform the following:
a) Solve for all values of x that satisfies the equation.
Answer: x =
x=1 or
How do I find out the graphing for -x^2+4x+5=0