Please help this is important I need to show work too! Brainliest and 20 points

Answer:
10 because 5+7 is 12 12 is closer to 10 then 15
so ten. below is your reason
Step-by-step explanation:
If i add 5+7 that will give me 12 i know that when you round you always round to the nearest tenth so i know that 12 is closer to 10 then 15 so my answer will be ten
can i please have brainliest please
have a great day!! :)