exam Maths Puzzle Numerical Ability

My problem is: Find the inverse of the function f(x)=log(base2)(x-3)+7; using algebra. State the domain and range of both functions.
I understand the the base of a logarithm is an

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find a slope of (3,6) and (2,5) R=A(T2-T1)/H , FOR T2 (THERMAL RESISTANCE)