9s - 9
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In a square by definition all sides are equal, and the length of a side may be designated by s. The perimeter, 4s, is apparently stated to be equal to 9s - 15. given these conditions, 4s = 9s - 15; subtracting 4s and adding 15 5o each side results in 15 = 5s or s = 3. However, the language of the problem is ambiguous and could instead be interpreted as 4s = 9(s - 15). If that interpretation is used, 5s = 135, and s would equal 27.
5s-r
16s + 4s = 20s
(4s + 1)(4s + 1) or (4s + 1)2
That depends on the value of s.