8.Question 8The value of p after this command: A = [1:4; 5:8; 9:12]; p = size(A);1 pointwill be 12will be a 3-by-4 matrixwill be a 2-element vector4

Question 7The variable t after these commands t = (16:-4:1) ' .^ 2 will be1 pointa 4-element vectora 4x4 matrixa scalarNone of the above. MATLAB will print an error message.

9.Question 9Matrix multiplication works if its two operands1 pointare vectors; specifically, the first one is a column vector and the second one is a row vector of any length.are scalars. are square matrices of the same size.The first and second options are correct.The second and third options are correct.All of the options are correct.

To find the value of the element \( a \) in the matrix \( 2P + 3Q \), we need to perform the matrix operations. Given: \[ P = \begin{pmatrix} -9 & 1 \\ 7 & -1 \end{pmatrix} \] \[ Q = \begin{pmatrix} 3 & 8 \\ 9 & 6 \end{pmatrix} \] First, calculate \( 2P \): \[ 2P = 2 \begin{pmatrix} -9 & 1 \\ 7 & -1 \end{pmatrix} = \begin{pmatrix} 2 \cdot -9 & 2 \cdot 1 \\ 2 \cdot 7 & 2 \cdot -1 \end{pmatrix} = \begin{pmatrix} -18 & 2 \\ 14 & -2 \end{pmatrix} \] Next, calculate \( 3Q \): \[ 3Q = 3 \begin{pmatrix} 3 & 8 \\ 9 & 6 \end{pmatrix} = \begin{pmatrix} 3 \cdot 3 & 3 \cdot 8 \\ 3 \cdot 9 & 3 \cdot 6 \end{pmatrix} = \begin{pmatrix} 9 & 24 \\ 27 & 18 \end{pmatrix} \] Now, add \( 2P \) and \( 3Q \): \[ 2P + 3Q = \begin{pmatrix} -18 & 2 \\ 14 & -2 \end{pmatrix} + \begin{pmatrix} 9 & 24 \\ 27 & 18 \end{pmatrix} = \begin{pmatrix} -18 + 9 & 2 + 24 \\ 14 + 27 & -2 + 18 \end{pmatrix} = \begin{pmatrix} -9 & 26 \\ 41 & 16 \end{pmatrix} \] The element \( a \) is the element in the second row and second column of the resulting matrix: \[ a = 16 \] Therefore, the correct answer is: \[ \boxed{16} \]

Determine the value of A after the following MATLAB commands:A = [8  1  6; 3  5  7; 4  9  2];A(:,2) = [];

What is the value of C after the following MATLAB command?A = [ 1  2 ];B = [ 3  4 ];C = [ A'  [ B; B] ]';Question 15Select one:a.[ 1  2; 3  4; 3  4]b.[ 1  3  3; 2  4  4]c.[ 1  3  4; 2  3  4]d.[ 1  2; 3  3; 4  4]e.None of the above