exam Maths Puzzle Numerical Ability

A house that is assessed for 12,00 pays $960 in realty taxes. what should be the realty tax on a house that is assessed for $16,500?

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For positive numbers a and b and natural number n show that 1/a+b + 1/a+2b +....+ 1/a+nb < n/squrt root a(a+nb). i need to use the discriminant to determine the number of solutions of this quadratic equation, and whether the solutions are real or complex. i have to find the roots, but i do have to determine the number and types of solutions. x2 + 6x - 7 = 0