X is always dependant to Y. so that should answer the 1st one. the 2nd looks to be around 17-18. 17.5 maybe. and the 3rd is yes cause he does not go to the pool so it isnt any cost.
Use Google or Wolfram Alpha
Answer:
the answer is 
Step-by-step explanation:
hope this helps :)
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4/5 because 8/10 is equal to 4/5 which is the simplest form<span />