book Maths Puzzle Numerical Ability

given x + iy form, write in polar form: 5-i

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book Other Question

Does this parabola open up, down, left or right?

{{{x=-2y^2}}}
I know all the answers to these problems but i do not understand how to write the equations to them.
Suppose you are selling stuffed animals for $6 each. You sold six more rabb