Carbon Dioxide: o2c
Water: h2o
Oxygen: o2
Water is h2o because there are 2 hydrogen molecules and 1 oxygen molecule.
h2 = 2 hydrogen molecules
o = 1 oxygen molecule
That is a ratio. If you mean the simplified version, then 2:7
Answer: n+2
Two lawns more than last week so two more than something with n being that something is; n+2
