How to evaluate the finite arithmetic sequence

What is the square root of 45? (step by step working plz)

Maria donates a fixed amount, a, to a charity each month. if she donates $300 in 12 months, what is the equation for a? a. a + 300 = 12 b. a × 300 = 12 c. a × 12 = 300 d. a + 12 = 300 e. a + 32 = 100

Type the correct answer in each box. use numerals instead of words. if necessary, use / for the fraction bar. consider the given table.