What kind of indent is often used in preparing a bibliography?

A hanging indent.

Explanation:

Indent means starting the first line further away from the margin of the rest of the sentence.

A hanging indent refers to the first line being closer to the margin than the rest of the sentence.

This type of indent allows for a more visually appealing bibliography and makes it easier for the reader to quickly skim through the bibliography without having much problems while doing it.

answer; i believe the correct answer is norming;

productive most commonly means: achieving or producing a significant amount or result.

explanation:

productive can also mean:

these depend on how the word productive is used. most likely productive will mean   achieving or producing a significant amount or result.