exam Maths Puzzle Numerical Ability

In interval notation, what is the domain of f(x) = x?

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Okay...John Dashwood recieved a 75cent/h raise for his part ime job. He can now eard his former weekly salary of $63 working 2 h less. How many hrs. a week did he work before he recieved his raise? Identify the vertex for the graph of y=4(x+3)^2+4