What are the next four numbers in the pattern below? 3, 9, 7, 11, 17, 15, a. 13, 19, 17, 23 b. 13, 11, 17, 23 c. 21, 23, 17, 23 d. 21, 19, 25, 25

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Carl's candies has determined that a candy bar measuring 3 inches long has a z-score of +1 and a candy bar measuring 3.75 inches long has a z-score of +2. what is the standard deviation of the length of candy bars produced at carl's candies?

36x2 + 49y2 = 1,764 the foci are located at: (-√13, 0) and (√13,0) (0, -√13) and (0,√13) (-1, 0) and (1, 0)edit: the answer is (- the square root of 13, 0) and (the square root of 13, 0)