exam Maths Puzzle Numerical Ability

What is the domain of g(x)=ln(x-4).Please explain how you obtained your answer.

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exam Other Question

X2+x+3 4X +3
______ + ______
X+2 x+2
The cost of producing a number of items x is given by
C = mx + b, in which b is the fixed cost and m is the variable cost (the cost of producing one more item).
A) If the fixed cost is $40 and the variable cost is $10, write the cost equation.