exam Maths Puzzle Numerical Ability

R=A(T2-T1)/H , FOR T2 (THERMAL RESISTANCE)

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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 A company has 3000 passengers daily paying a 25 cent fare. For each nickel increase in fare, the company projects it will lose 80 passengers. What fare increase will produce 994 in daily revenue?