Developer martin cray had low credibility when he began his speech to a neighborhood group opposed to a new shopping center he hoped to build. during the speech, his credibility increased because his audience was impressed with his command of the facts and his willingness to work with the neighborhood on plans for the shopping center. according to your textbook, the credibility produced by everything martin said and did during the speech is called credibility.

Derived credibility

Explanation:

Credibility refers to how one is trustworthy which may make people pay attention to what they say otherwise without being trustworthy audience is less likely to believe what you say.

Derived credibility is the credibility that one is able to create as they speak to the audience or during the speech delivery this is created by the quality and professionalism of one's speech.

So as the word derived mean to get something from , you also get credibility from your speech that you are delivering well if audience sees quality and professionalism in it.

its tr3way you already know