A toothpaste firm claims that a survey of 65 people revealed the following results: 8 use Happy and Close Up 9 use Happy and Colgate 11 use Colgate and Close Up 21 use Happy only 15 use Close Up only 11 use only Colgate only How many uses exactly 2 brands? Select one: O a. 8 O b. 13 O c.5 O d. 15

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A: given f(x)=x3-9x+1 in the interval [2,4] n=5  f(2)=x3-9x+1=23-9(2)+1=8-18+1=-9<0…