Ok I asked the question three days ago why can I get on a free wifi connection with my phone but not my tablet

The free Wi Fi router may have run out of IP leases on its DHCP server just when you were trying to connect the tablet. If the leases are as an example say one week long then if lots of people connect to the free wi fi they get a lease for one week. So if the device comes back within the week it already has an IP address assigned to it and works. If a new device comes along it has to ask the DHCP server via the WI FI to assign it an IP address. If all available IP addresses are leased from the WI FI router the device will not get assigned an ip address. Would suggest trying to connect the Tablet on another Wi FI system to test it works.
I had this happen on my mobile phone when I was in Surfers Paradise in a Coffee shop and suspected the lease time on the WI FI router was too long for the amount of short term customers using the coffee shop. (the staff had no idea on why the Wi FI was not working so it would have been pointless to try and explain this concept to them and how to change the lease time on the dhcp server) Also there is a limit to the simultaneous number of users on a Wi Fi frequency on one access point . Unless the WI FI uses multiple WI FI access points.

Go into settings on your tablet. Click on the WiFi connection. All the available connections will show up as well as the strength of the signal. If the signal is weak it takes forever to connect. Maybe your phone is more sensitive than your tablet.