exam Maths Puzzle Numerical Ability

If the sum of two numbers is 1, and their difference is 4, what are the two numbers?

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Hi Can I have some help with the following problem?

Use the given information to find the constant of proportionality.
z varies inversely as t. If t = 10, then z = 9. find the rectangular form of 4(cos(5/6 pi)+ i sin(5/6 pi)

find the trigonometric form of (sqrt3)-i.

please help, I need step by step help, thanks