Learn Dutch: Jullie hebben de slechte alinea in het eerste concept geschrapt. - You all deleted the bad paragraph in the first draft.

It can mean both! While het concept often translates to concept or idea, when you are talking about writing, documents, or designs, it specifically means a rough draft.

Why does eerste get an -e added to it if concept is a het-word?

You still add an -e to adjectives (and ordinal numbers like eerste) before a het-word if the definite article het comes right before it. You only drop the -e for a het-word when it is preceded by een (like in een eerste concept) or has no article at all.

How do we form the past participle geschrapt, and why does it end in a -t?

Geschrapt comes from the verb schrappen, meaning to delete or to scrap. To find the ending, you can use the 't kofschip rule: drop the -en from the infinitive to get the stem ending in p. Because p is one of the 't kofschip consonants, you add a -t rather than a -d.

Is there a reason slechte gets an -e ending?