The two ways that the author establishes credibility in this passage are:
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By using colloquialisms and informal language to connect to the audience: The author employs a conversational tone and relatable questions to connect with readers, making her more approachable and establishing a sense of trust.
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By using informal language and a variety of sentence structures and types: The author's use of informal language and diverse sentence structures helps maintain reader engagement, making her experiences and insights about thrift shopping feel authentic and credible.
However, it's important to note that the first two options may be more relevant than the others, as they directly address the establishment of credibility through the writing style.