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OpenStudy (anonymous):
Write a mathematical expression for: the sum of twice a number n and 20. A. n/2 + 20 B. 2n + 20 C. 2n - 20 D. n + 2(20)
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jimthompson5910 (jim_thompson5910):
"twice a number n" means 2*n or simply 2n "the sum of twice a number n and 20" translates to 2n+20 So the answer is choice B
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