2. A. Write a MATLAB code to plot the function () = 4 ^2 * ^3 for the time range 0 3 seconds. Plot the function using the following two methods: I. Use MATLABs colon operator and vector operations. II. Use iterations (for-loop) and scalar operations. B. Let = 3, 1, 5, ,21. I. Find the summation of the elements of that are greater than the 4 element and less than or equal to the last element. Store the output in sum_x. II. Rearrange the elements of in descending order and store the new vector as x_des.