QUESTION 3 To conduct the LU decomposition method on given equations of the form AX-C. it consists of the forward substitution step of LZ-C. For the system of equations 172 5 7 22 13 17.1 3 2 15 11 7 7.2 16 Z2 isKeep 4 decimal points. (Hint) Use Example 2 in Ch04.07 as a reference. QUESTION 4 To solve a set of equations AX-B by LU decomposition requires back substitution UX-Z given by the algorithm below. x(n)- Z(nyU(n,n) for i (n-1)-1:1 sum = Z(i) forj- (G+1:1 sum = sum-U(ij)*x(j) end x(i)-sum/UGi) end if n- 183, where n is the number of equations, the sum of the total number of (Hint Track a few iterations of the OUTER for-end loop manually to see how many multiplication and multiplication and division operations in the algorithm is division operations are performed during each teration, You shou