Please show work for a and b

NON 7. (a) (14pt) Let W = Span Find an orthonormal basis for W. (b) (9pt) Find a least-squares solution of the inconsistent system Ax = b, where A = NOT O 09 and HNO b = 18 9 0 0 7. (c) (3pt) TRUE or FALSE: If a square matrix A is not invertible, then it may not be possible to write A = QR for a matrix Q with orthonormal columns and an invertible upper-triangular matrix R. (d) (3pt) TRUE or FALSE: Every symmetric real n x n matrix is orthogonally diagonalizable