exam Maths Puzzle Numerical Ability

find a slope of (3,6) and (2,5)

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A plumber needs 3 times as much solid pipe as perforated pipe to lay a drain line 200 feet long. How much solid pipe is needed? 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