MATLAB

Express each of the polynomials below as a vector of coefficients in MATLAB, and then

evaluate them at $x=2,4,$ and $6.$

a$)x^3-3x^2+x+5$

b$)3x^3-4x^2-2$

c$)3x^4-2x^3+4$

The table below contains values of distance $($in miles$)$ and speed of a car $($in mph$)$ as

measured at several points along a highway.

a$)$ At the command prompt, create a matrix variable containing the data, and then save the

data to a file.

b$)$ Write a script that loads the data from the file, extracts the data into two separate vector

variables, and creates a properly labelled plot of the data, as well as a best$-$fit straight line

on the same graph. Use the legend command to display the equation of the line and the

$r^2$ value for the regression. $($Note: you may use your linfit function for the regression,

but be sure to include that code with your homework submission.$)$