exam Maths Puzzle Numerical Ability

I am having difficulty with this equation.
Find the inverse of the function,

f(x) = (3 + 2x)/(2-5x)

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exam Other Question

How do I find the y-intercept for -x + 3y = 15? Calculate the perimeter of the figure if one side is 1.4cm, 6sides have 2.1cm, 3 sides have 2.8cm, and 2 sides have 3.5cm.

Thanks!