Which fatty acid is represented by the notation 20:4?

### Why this is right The notation 20:4 indicates a fatty acid with 20 carbon atoms and four double bonds. Arachidonate has this notation. ### The other options - **Oleate**: commonly written 18:1, with 18 carbons and one double bond. - **Linoleate**: commonly written 18:2. - **Linolenate**: commonly written 18:3. ### Terms - **Fatty-acid notation**: a shorthand giving carbon count followed by double-bond count. - **Arachidonate**: the ionized form of arachidonic acid, a 20-carbon fatty acid with four double bonds. ### Remember Read the first number as carbons and the second as double bonds.