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Is the square root of 4 plus the square root of 16 rational?

Amanda went into the grocery business starting with five stores. after one year, she opened two more stores. after two years, she opened two more stores than the previous year. if amanda expands her grocery business following the same pattern, which of the following graphs represents the number of stores she will own over time?

If the value of cos330°is√3/2 then find cos 165°.