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Answer: Rico is right.
(-1)(3x + 5)²
Step-by-step explanation: If it were the difference of two squares, the -30x would not be there.
It makes sense to factor out (-1) fry the trinomial, leaving all positive terms.
Then factor 9x² + 30x + 25 as
(3x + 5)²
The answers to the questions
C = 3.5t....when t = 15
c = 3.5(15)
c = 52.50 <==
The answer is 20
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