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Combining exponents from GMAT PREP

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nazimd73
 Post subject: Combining exponents from GMAT PREP
 Post Posted: Wed Mar 18, 2009 9:57 pm 
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Course Students


Posts: 2
Hi,
Can someone help me solve this problem.

(5^21) x (4^11)= 2 x 10^n.


What is n
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eileen1017
 Post subject: Re: Combining exponents from GMAT PREP
 Post Posted: Thu Mar 19, 2009 10:59 pm 
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Posts: 11
nazimd73 wrote:
Hi,
Can someone help me solve this problem.

(5^21) x (4^11)= 2 x 10^n.


What is n


4^11 can also be rewritten as (2^2)^11, then 2^22 or (2^21)*2

(5^21)x(2^21)x2=2* (5x2)^21=2*10^21, hence n=21
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RonPurewal
 Post subject: Re: Combining exponents from GMAT PREP
 Post Posted: Sat Mar 21, 2009 7:24 am 
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ManhattanGMAT Staff


Posts: 7146
tricky-exponents-t1187.html
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