Arp table output from ping

Arp table output from ping

homework problem
IP - 10.0.0.98 Subnet - 255.255.0.0 Default gateway - 10.0.250.254
Commands
ping 10.0.255.255
arp -a
Output
internet address physical           address type
10.0.116.21     00-00-f4-a9-9d-d4    dynamic
10.0.224.34     00-00-1d-0f-4b-71     dynamic
10.0.108.2       00-00-f4-a9-98-21    dynamic
10.0.17.129      00-00-f4-b1-b6-57   dynamic
10.0.7.141      00-10-5a-05-ef-f9    dynamic
10.0.1.250     00-00-0c-4e-32-90    dynamic
10.0.1.251      00-00-0c-4e-32-90   dynamic
169.254.0.1    00-00-09-6c-4b-58     dynamic
When i ping a broadcast ip, I know all the devices on the lan should respond with its mac and ip address which are then saved in the arp table.
What are the arp entries for 10.0.1.250 and 10.0.1.251? Are these simply 2 devices that responded to the broadcast? How come they have the same mac? How is there a arp entry for 169.254.0.1? That doesn't seem to be on the lan at all. Is this a dhcp server or something?