exam Maths Puzzle Numerical Ability

Hello,
can anyone help me factor these polynomals completely.
Much appreciated.

Todd

125 - 8x cubed ?

54t cubed + 16v cubed. I believe this one must ne prime

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exam Other Question

Graph each equation by plotting points.

x= -7
Will someone please help me put the equation 3-2i in polar form?
Thank you, Natalie