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100 points for $49 worth of Veritas practice GMATs FREE VERITAS PRACTICE GMAT EXAMS Earn 10 Points Per Post Earn 10 Points Per Thanks Earn 10 Points Per Upvote ## Which of the following is equal to 2^k*5^(k-1)? tagged by: Vincen ##### This topic has 1 expert reply and 0 member replies ### Top Member ## Which of the following is equal to 2^k*5^(k-1)? Which of the following is equal to 2^k*5^(k-1)? A. 2*10^(k-1) B. 5*10^(k-1) C. 10^k D. 2*10^k ) E. 10^(2k-1) The OA is A. How can I rewrite the given expression to get A? I need your help experts. Please. Thanks in advance. ### GMAT/MBA Expert GMAT Instructor Joined 04 Oct 2017 Posted: 551 messages Followed by: 11 members Upvotes: 180 Hello Vincen. Let's rewrite the expression as follows $$2^k\cdot5^{k-1}=2\cdot2^{k-1}\cdot5^{k-1}=2\cdot\left(2\cdot5\right)^{k-1}=2\cdot10^{k-1}.$$ This tell us that the correct answer is A. I hope this can help you to clarify your doubt. I'm available if you'd like a follow up. Regards. _________________ GMAT Prep From The Economist We offer 70+ point score improvement money back guarantee. Our average student improves 98 points. Free 7-Day Test Prep with Economist GMAT Tutor - Receive free access to the top-rated GMAT prep course including a 1-on-1 strategy session, 2 full-length tests, and 5 ask-a-tutor messages. Get started now. • Free Practice Test & Review How would you score if you took the GMAT Available with Beat the GMAT members only code • 5 Day FREE Trial Study Smarter, Not Harder Available with Beat the GMAT members only code • Free Trial & Practice Exam BEAT THE GMAT EXCLUSIVE Available with Beat the GMAT members only code • Magoosh Study with Magoosh GMAT prep Available with Beat the GMAT members only code • FREE GMAT Exam Know how you'd score today for$0

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