exam Maths Puzzle Numerical Ability

For the function defined by f(x)=5x-4, find a formula for f^-1(x).

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exam Other Question

How do i go about figuring out how to write an equation in slope-intercept form that satisfies each given condition and finding the slope when the x-intercept = 3 and the y-intercept = 2 and there is no slope given two,four,six are the first three numbers that do not contain the letter e when they are wirtten out. what is the 23rd such number

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