exam Maths Puzzle Numerical Ability

How do I find the domain of g(t)=log(t+2) and g(x)=ln(x-4)

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Question #1: Simplify: (2 root3 -4)squared

#2: Solve and check: root y+2 =4-y How many three digit numbers can be formed using the digits 1,2,3,4,5,6 and 7 if no digit can be replaced in a number? I have a slight Idea on how to do this but I get stuck every