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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Could someone please help me with this problem?

Graph y=2^x-3. Label all x-intercepts, all y-intercepts, horizontal asymptotes, and vertical asymptotes.

Thank you!! Hi. Can I have some help with inverse functions?

If g(x) = -2x - 7, find g ^-1(3).