or in the learning modules. Use the matrices below to perform matrix multiplication. 3 12 4 7 5 B = 9 4 1 8 0 12 0 8 -10 If the operation is undefined, enter NA. Hint: To create a matrix in Mobius, click on the icon ::: that has three rows of three dots - it's next to the infinity symbol. Specify the appropriate number of rows (horizontal) and columns (vertical). b sin (a)