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

the perimeter of a rectangle is 30 meters. If the length is 5 meters more than the width, then what is the length and the width of the rectangle. Make a picture.

Please show me how to solve this problem? thanks! Find the coordinate of the image of point (5, 7) translated down 5 units.