exam Maths Puzzle Numerical Ability

I have a couple quick questions.

1.)Divide (30b^3+20b^2+25b+41)/(5b+5)

2.)Subtract and simplify (7-x/x-6)-(7x-9/6-x)
I got 6x-2/x-6 is theis correct or does it simplify even

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exam Other Question

find fixed interest rate, if a principal of $5,000 invested for 4 years earns $900, how much interest will $6,000 invested for 3 years earn at the same interest rate? This is not from a texbook. How would you graph the following system of inequalities?

y<= x-3
3x+y<=1

Thanks!