for 9-10+3 gives 2 , but doesnt we start from addition , e. g 10+3 is 13 then 9 -13 gives us -4 . can someone explain .

Can someone me with this problem . show your work .

If a baby uses 15 diapers in 2 days, how many diapers will the baby use in a year?

!! 10 ! a westbound jet leaves central airport traveling 635 miles per hour. at the same time, an eastbound plane departs at 325 miles per hour. in how many hours will the planes be 1900 miles apart?