Answer:
A, 3 units. Plug in each number where x is and see which sums up to 23. Hope this helped :) !
12
Explanation:
Add up the given side lengths : 4x + 3x - 5 + 2x + 1 = 9x - 4 and this is equal to 23
9x - 4 = 23 ➡ 9x = 27 ➡ x = 3
The side lengths will be 12, 7, and 4
The longest one would be 12 if we replace x with the value we found.
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