exam Maths Puzzle Numerical Ability

Sketch one cycle of the curve

y = 2 sin 3x-1

Give the period, amplitude and phase shift

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exam Other Question

The length of a rectangle is 1 in. more than twice its width. If the perimeter of the rectangle is 50 in., find the width of the rectangle. Solve using an algebraic equation.

Thank you very much! 3x^3-24

Since 24 is not a perfect cube I think I factor out the 3 as follows:
3(x^3-8)
Am I on the right track?