1) Write the code to clear the command window 2) Write the code to close all previous figures 3) Write the code to clear all previous parameters 4) Divide the figure on 4 subfigures (2 rows and 2 columns) and put the target graph of function in the second subfigure 5) Write a vector x that containing elements from -4 to 4 with length 20. Let's y=x+3x² and y1 = x² - 3x3 6) Sketch both function y and y1 7) Choose the color of the function y black and the color of the function y1 red and the width for both lines 2 and choose marker as o and << with size 2 and with maker color red and blue, for the functions y and y1, respectively. 8) Put a title as: Graph of two special functions 9) Write all octave codes to get the following graph 100 Graph of two special functions 50 ° -50 -100 low y function. y1 Function high xaxis 11