exam Maths Puzzle Numerical Ability

If y varies directly with x, and y = 280 when x = 400, find the constant of variation k.

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Hi

I need some help on my homework which i am finding difficulty of doing. The question is

Q1. Not everyone has the same pulse rate - and pulse rate can be affected by a Could I please get some assistance with the following problem:

Write
4[cos (3pi)/4 + i sin (3pi)/4] in the form a + bi

Thank You
RF