Find the product.(r - 15)2

A. 225r2 - 30r + 225
B. r2 - 30r + 225
C. r + 225
D. r2 + 225


Answer: B

Mathematics

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Use the substitution method or the elimination method to solve the system. If the system has infinitely many solutions, express the ordered pair in terms of x or y.  8x - 5y = 3-24x + 15y = -12

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