Which word in this sentence is an open compound In class I use a processor and typewriter?

The open compound in the sentence "In class I use a processor and typewriter" is typewriter.

Here's why:

* Open compounds are two or more words that are written separately but function as a single unit, often with a hyphen.

* Typewriter is formed from the words "type" and "writer", joined together to create a single word.

The other words in the sentence are not compound words:

* Processor is a single word.

* Class is a single word.