exam Maths Puzzle Numerical Ability

13.28 Ahospital emergency room analyzed n=17,664 hourly observations on its average occupancy rates

using six binary predictors representing days of the week and two binary pred

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Hi. Can you please solve this question and please let me know what is the way to arrive at the solution. Find X where X is,
X = [(1/11) + (1/12) + (1/13) + ........ + (1/20)] please show how to simplify

1. 16^1/5*64^1/5

2. 7^4/5 over 7^1/3

3. (10^3/4 * 4^3/4)^-4

4. 1 over x^-2/3

5. (xy^4/5)^2/3

I am so lost and help with any of the above problems will be greatly appreciated
LLO