A square plywood platform has a perimeter that is 6 times the length of a side, decreased by 6. Find the length of a side. (Recall the formula P = 4s.)
Answer
A
5
B
1
C
3
D
2
Explanation
For a square, the perimeter is P = 4s. The description gives P = 6s − 6, so set 4s = 6s − 6. Solving gives 2s = 6 and s = 3, so the correct choice is c, 3.
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