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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exam Other Question

Solution A is 80% Alcohol and Solution B is 50% Alcohol. How many Liters of each solutions should be mixed in order to make 100 Liters of a solution that is 68% alcohol? Find the slope and the y-intercept of the line. Write fractional answers in lowest terms.

3y+7x+5=9+7x

The slope is _____

The y-intercept is (0,______)