What is the sum of the first eight terms of the geometric series 2 + 6 + 18 + 54 + … ?

At a kentucky friend chicken, a survey showed 2/3 of all people preferred skinless chicken over the regular chicken. if 2,400 people responded to the survey, how many people preferred regular chicken?

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How do you find percent change? ? i will give brainliest for the bestme i don’t understand