Answer:
x = 21
Step-by-step explanation:
The 2 angles form a straight angle and are supplementary, thus
7x + 9 + 2x - 18 = 180, that is
9x - 9 = 180 ( add 9 to both sides )
9x = 189 ( divide both sides by 9 )
x = 21
12 x 3 = 36
48 - 36 = 12
The 4th side is also 12 feet.
Answer:the answer is 4 that is truly The answer
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