What is the square root of 84

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?

Factor the polynomial by its greatest common monomial factor.

Is experimental probibilty the same as the observed frequency in math? i need the answer asap!