GMAT Question of the Day - Daily to your Mailbox; hard ones only

It is currently 16 Nov 2018, 23:13

Close

GMAT Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Close

Request Expert Reply

Confirm Cancel
Events & Promotions in November
PrevNext
SuMoTuWeThFrSa
28293031123
45678910
11121314151617
18192021222324
2526272829301
Open Detailed Calendar
  • Free GMAT Strategy Webinar

     November 17, 2018

     November 17, 2018

     07:00 AM PST

     09:00 AM PST

    Nov. 17, 7 AM PST. Aiming to score 760+? Attend this FREE session to learn how to Define your GMAT Strategy, Create your Study Plan and Master the Core Skills to excel on the GMAT.
  • GMATbuster's Weekly GMAT Quant Quiz # 9

     November 17, 2018

     November 17, 2018

     09:00 AM PST

     11:00 AM PST

    Join the Quiz Saturday November 17th, 9 AM PST. The Quiz will last approximately 2 hours. Make sure you are on time or you will be at a disadvantage.

If m^(-1) = -1/3 then m^(-2) is equal to

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

Manager
Manager
avatar
Joined: 02 Dec 2012
Posts: 177
If m^(-1) = -1/3 then m^(-2) is equal to  [#permalink]

Show Tags

New post 20 Dec 2012, 06:23
3
11
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

86% (00:38) correct 14% (00:53) wrong based on 1650 sessions

HideShow timer Statistics

If \(m^{(-1)} = -\frac{1}{3}\) then \(m^{(-2)}\) is equal to

(A) -9
(B) -3
(C) -1/9
(D) 1/9
(E) 9
Most Helpful Expert Reply
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 50619
If m^(-1) = -1/3 then m^(-2) is equal to  [#permalink]

Show Tags

New post 20 Dec 2012, 06:25
4
3
General Discussion
SVP
SVP
User avatar
Status: The Best Or Nothing
Joined: 27 Dec 2012
Posts: 1826
Location: India
Concentration: General Management, Technology
WE: Information Technology (Computer Software)
Re: If m^(-1) = -1/3 then m^(-2) is equal to  [#permalink]

Show Tags

New post 27 Feb 2014, 19:20
2
Walkabout wrote:
If m^(-1) = -1/3 then m^(-2) is equal to

(A) -9
(B) -3
(C) -1/9
(D) 1/9
(E) 9



\(\frac{1}{m} = \frac{-1}{3}\)

Squaring both sides

\(\frac{1}{m^2} = \frac{1}{9} =\)Answer = D
_________________

Kindly press "+1 Kudos" to appreciate :)

Target Test Prep Representative
User avatar
G
Status: Head GMAT Instructor
Affiliations: Target Test Prep
Joined: 04 Mar 2011
Posts: 2830
Re: If m^(-1) = -1/3 then m^(-2) is equal to  [#permalink]

Show Tags

New post 28 Jun 2016, 04:48
Walkabout wrote:
If m^(-1) = -1/3 then m^(-2) is equal to

(A) -9
(B) -3
(C) -1/9
(D) 1/9
(E) 9


Since we know that m^-1 = -1/3 and m^-2 = (m^-1)^2, then m^-2 = (-1/3)^2 = 1/9.

The answer is D.
_________________

Jeffery Miller
Head of GMAT Instruction

GMAT Quant Self-Study Course
500+ lessons 3000+ practice problems 800+ HD solutions

CEO
CEO
User avatar
D
Joined: 11 Sep 2015
Posts: 3122
Location: Canada
Re: If m^(-1) = -1/3 then m^(-2) is equal to  [#permalink]

Show Tags

New post 27 Jul 2016, 06:53
1
Top Contributor
Walkabout wrote:
If mˉ¹ = -1/3 then mˉ² is equal to

(A) -9
(B) -3
(C) -1/9
(D) 1/9
(E) 9


Some good solutions here.
Here's one more approach:

CONCEPT: b^(-n) = 1/(b^n)

Given: mˉ¹ = -1/3
Rewrite as: 1/m = 1/(-3)
We can see that m = -3

So, mˉ² = 1/(m²) = 1/(-3)² = 1/9

Answer:

RELATED VIDEO

_________________

Test confidently with gmatprepnow.com
Image

Current Student
User avatar
D
Joined: 12 Aug 2015
Posts: 2633
Schools: Boston U '20 (M)
GRE 1: Q169 V154
GMAT ToolKit User Premium Member
Re: If m^(-1) = -1/3 then m^(-2) is equal to  [#permalink]

Show Tags

New post 29 Jul 2016, 10:52
Intern
Intern
User avatar
B
Joined: 12 Jun 2016
Posts: 27
Location: India
Concentration: Entrepreneurship, Finance
GPA: 3.76
WE: Information Technology (Computer Software)
Re: If m^(-1) = -1/3 then m^(-2) is equal to  [#permalink]

Show Tags

New post 29 Jul 2016, 11:14
1
m^(-1) = -(1/3)
Squaring both sides
m^(-2) = 1/9

Ans. D
Intern
Intern
User avatar
Joined: 26 Sep 2016
Posts: 7
Re: If m^(-1) = -1/3 then m^(-2) is equal to  [#permalink]

Show Tags

New post 27 Sep 2016, 13:26
\(m^-1 = \frac{-1}{3}\)

\(\frac{1}{m} = \frac{-1}{3}\)

By cross multiplication

\(-m = 3\)

Squaring both sides

\(m^2 = 9\)

So \(m^-2 = \frac{1}{9}\)
Intern
Intern
avatar
B
Status: GMAT PREP
Joined: 22 Jul 2018
Posts: 3
Concentration: Technology, Entrepreneurship
Re: If m^(-1) = -1/3 then m^(-2) is equal to  [#permalink]

Show Tags

New post 06 Aug 2018, 14:56
why is this listed under the hard questions in OG 19?
GMAT Club Bot
Re: If m^(-1) = -1/3 then m^(-2) is equal to &nbs [#permalink] 06 Aug 2018, 14:56
Display posts from previous: Sort by

If m^(-1) = -1/3 then m^(-2) is equal to

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  


Copyright

GMAT Club MBA Forum Home| About| Terms and Conditions and Privacy Policy| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.