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What is the result of adding the matrices A = [[2, 3], [4, 5]] and B = [[1, -2], [3, 0]]?

Which of the following operations is NOT valid for matrices?

What is the result of subtracting the matrices A = [[2, 3], [4, 5]] and B = [[1, -2], [3, 0]]?

Which of the following is the transpose of the matrix A = [[1, 2, 3], [4, 5, 6]]?

What is the result of adding the matrices A = [[1, 2, 3], [4, 5, 6]] and B = [[7, 8, 9], [10, 11, 12]]?

What is the result of subtracting the matrices A = [[1, 2, 3], [4, 5, 6]] and B = [[7, 8, 9], [10, 11, 12]]?

What do w, x, y and z equal if [[w,7],[2y,20]] - [[9,x],[4,-3]]=[[4,3],[18,z]]