exam Maths Puzzle Numerical Ability

Question #1
Why are polynomials important?

Question #2

What are some challenges about working with rational expressions? What are some strategies to overcome the challenges?

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exam Other Question
I am not sure the answer to this question.
The problem is...if (x+yi)/(1+i)=(7)/(7+y), where x and y are real, what is the value of x+y?

I got 202i+346
I am not sure if that please help

evaluate

a - absolute vale of b a^2 - ba if a = -3 and b = -4