exam Maths Puzzle Numerical Ability

A business invest $10,000 in a saving account for two years. At the beginning of the second year, and additional $3500 is invested. At the end of the second year, the acount balan

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Here is my question.
1. 0.4x+1≤1.2 x-8
Solution is {x∣x ??

2. -0.9x <-18
Solution is x?? (20x^4-2x^3+5x+3)/(2x-3). I understand how to divide polynomials, but this equation stumped me. Could you provide me direction?