6. Look at the following sample of MATLAB code (which has line numbers added for ease of reference) and answer the following questions about it. total - 0; for k - 1:15 total = 7***2 - 2** + total; end disp('The sum for 15 terms is:') disp (total) 5 6 a) Specify the main MATLAB feature that is used in this sample [3 marks] b) How many times calculation in the closed loop will be executed if you run this code? [3 marks] 7. Name two MATLAB conditional statements. [3 marks) 8. Name two MATLAB loops and write the basic general structure for one of them. [3 marks) 9. Write the following equations in matrix form. xi(k+1) = C11X1(k) + a(k) xz(k+1) = C21x1(k) + C22x2(k) + d(k) x3(k+ 1) = C32x2(k) + C33x3(k) x (k+1) = C12X3(k) + Cesxs(k) where Cy are coefficients, and a(k), and d(k) are constants [4 marks)