book Maths Puzzle Numerical Ability

I am not sure how to solve this problem when there is a x^3

x^3 + y = 0
x^2 - y + 0

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show me steps to solve this 8b-4=5b+8 Dear Sir/Madam,
I am confronted with the following problem:
"Suppose $31,000 is deposited in a savings account that has an interest rate of 5.7% per year and the interest is co