2 0 Compute each matrix sum or product if it is defined. If an expression is undefined, explain why. Let A = 5 -5 4 D= 25 -2 5 and E= -5 A + 2B, 2C-3E, DB, EB OA. A + 2B = 7 23 -3-³-[²-5-2] --[-22] B= C= 1 Compute the matrix sum A + 2B. Select the correct choice below and, if necessary, fill in the answer box within your choice. (Simplify your answer.) OB. The expression A + 2B is undefined because B is not a square matrix. O C. The expression A + 2B is undefined because A and 2B have different sizes. O D. The expression A + 2B is undefined because A is not a square matrix.

Compute the sum of A = 85 63 and B = 2a 4b - 3c - 8d possible A+B= (Simplify your answer. Type an expression for each matrix element. Use integers or fractions for any numbers in the expression.) JA الله S Nex

Row reduce the matrix A = 5 1 -2 -3 2 -7 1 -7 26 001 1 -7 4 LO to RREF.

The table below represents the data for the salaries of 4 secretarial workers at a local law firm. The first row represents each employee's wage per hour, and the next 6 rows represent the amount of hours each person worked for the corresponding days of this 1 week time period. (The law firm is closed on Sundays) Use matrix multiplication to find the amount of money this law firms paid their secretaries each day of the week.