20 April, 09:28
Add the two expressions 3w + 4 and 3w - 9
20 April, 11:23
All together the expression would look like (3w+4) + (3w-9). Since you can add like numbers, 3w, 3w+3w would be 6w. Then, - 9 + 4 is - 5. So, now you have your two sums, 6w and - 5. So, the sum of the two expressions would be (6w - 5)
20 April, 11:23
3w+4 nothing can be done
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