# The scatter plot below shows the relationship between the diameter (x), in mm, and mass f(x), in grams, of a berry: ordered pairs 11, 0.4 and 12, 0.8 and 13, 1.2 and 14, 1.6 and 15, 2 and 16, 2.4 and 17, 3 and 18, 3.2 and 19, 3.6 and 20, 4

Which of the following functions is best represented by the scatter plot?

f(x) = −0.4 + 4x

f(x) = 0.4 − 4x

f(x) = 4 − 0.4x

f(x) = −4 + 0.4x

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carlosegoFor this case the first thing we must observe is that the mass increases 0.4 grams when the diameter increases 1 millimeter. Therefore, the slope of the line is given by: m = 0.4 Thus, the function that best suits the table is given by: f (x) = -4 + 0.4x For example, for x = 20 we have: f (20) = -4 + 0.4 (20) f (20) = -4 + 8 f (20) = 4 The result, matches the table. Answer: The function that is best represented by the scatter plot is: f (x) = -4 + 0.4x