Answer:
1. 2A + 3A
2. 2A - B
3. 2A
4. 2(A-B)
Explanation:
When multiplying matrix by a number you just multiply each number in the matrix by whatever you are multiplying. When adding 2 matrices you just add the corresponding number in each matrix. Ex: You add the top left number to the top left number. The same goes with subtraction.