I don't understand how to make the equation on number 6 PLZ help

Cynthia takes her dog to the park every 2 days. she bathes her dog every 7 days. if she took her dog to the park and bathed him today, how long will it be until she does both on the same day again?

Adifferent website gives the cost for the first train as £56.88 and the second train as £20.11 with a £9.50 charge for cycle storage for the whole trip. how much would the journey cost you?

Look at this pattern ; 1,4,9, number 10000 belongs in this pattern . what’s the place of this number?