exam Maths Puzzle Numerical Ability

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).

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exam Other Question

Plot each of the points for "x". f(0), f(3), f(-2), and f(a+1)

The problem:

f(x)=^15-x

^=square root.

I don't know how to do it when it is a square root. if you can hel 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?