A company that makes hair-care products had 3,000 people try a new shampoo. Of the 3,000 people, 21 had a mild allergic reaction. What percent of the people had a mild allergic reaction?

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answer:   x = 3 + √11     and     x = 3 - √11

step-by-step explanation:

x² - 6x + 9 = 11

(x - 3)² = 11

x - 3 = ±√11

    x = 3 ± √11

x = 3 + √11     and     x = 3 - √11

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