exam Maths Puzzle Numerical Ability

What is the sum of the first 15 terms in the geometric sequence 2, 4, 8?
sometimes i got 65534 and sometimes i got 65536, im doing something wrong lol

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exam Other Question

A) Given that f(x)=3x+5 find the ARC( average rate of change) on x=2 to X=5
B) with f(x) =3x=+5 find ARC on [x,x+h] and simplify
Find the domain and range of

square roott x^-8x