Just going along from left to right is the simplest way, but if an expression only contans addition and subtractions, then the order is irrelevant.
Aspartame itself is a compound, but if a sweetener contains it it is a mixture.
A mixture ( it contains lots of gases.)
This is a nonhomogeneous mixture.
A suspension contains particles that will settle out of the mixture if left sitting out.
A suspension contains particles that will settle out of the mixture if left sitting out.
It is a not a mixture. (P.S.This may not be correct)
It is not a mixture if it does not contain at least two substances.
A homogeneous mixture is a mixture which contains only one pure element.
substances
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It is probably more accurate to say that you breath in air, a mixture of gases which contains about 21% oxygen and 0,04% CO2, and you breath out a mixture of gasses which contains a far greater concentration of carbon dioxide than you inhaled (about 5% of the mass of all the exhaled gas).
That is the correct spelling of the noun "mixture" (combination of things).