Write a user-defined function that fits data points to a power function of the form y = bxm. Name the function [b, m] = powerfit (x,y), where the input arguments x and y are vectors with the coordinates of the data points, and the output arguments b and m are the constants of the fitted exponential equation. Use powerfit to fit the data below. Make a plot that shows the data points and the function.

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x 0.5 2.4 3.2 49 6.5 7.8 | 0.8 | 9.3 | 37.9 | 68.2 | 155 | 198