You are changing the sign on one so to keep an equilibrium you change the other sign too
You didn't give enough information. We don't know the yard size.
they have gathered 26 kilograms so far
Because they already had 2 kilograms before the new recycling plan ,and the new plan was to gather 1 kilogram each week and its been 24 weeks
So u just have to add the 24 kilograms +2 kilograms=26 kilograms
Your answer will be 18 hope this helps
