9514 1404 393
Answer:
see attached
Step-by-step explanation:
The sum is formed by adding corresponding elements. For example, the lower right element (row 3, col 3) of the sum is 5+4 = 9
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Using the distributive property is the correct first step.
Now, using the associative property of addition, you get
Simplify the right hand side:
Add 5 and
On the left side, use the associative property. On the right, commutativity and associativity:
Simplify.