9.(03.06 MC) Write the equation of the line that passes through the points (1, 7) and (5, 15) using function notation. (5 points)
O y = 2x + 5
O y = 4x + 8
Of(x) = 2x + 5
f(x) = 4x + 8

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?