exam Maths Puzzle Numerical Ability

Find the domain and range of

square roott x^-8x

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exam Other Question

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
How do you simplify the following fraction?

3a + b
______
6a + 2b