GRE Prep 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
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
y^7y^8y^-6
[#permalink]
16 Jul 2019, 02:20
16 Jul 2019, 02:20
1
Expert Reply
3
Bookmarks
00:00
Question Stats:
39% (00:30) correct
60% (00:26) wrong based on 113 sessions
Hide Show timer Statistics
Quantity A |
Quantity B |
\(y^7 \times y^8 \times y^{-6}\) |
\(3y^9\) |
A)The quantity in Column A is greater.
B)The quantity in Column B is greater.
C)The two quantities are equal.
D)The relationship cannot be determined from the information given.
Re: y^7y^8y^-6
[#permalink]
12 Sep 2019, 21:20
12 Sep 2019, 21:20
1
1
Bookmarks
Qty A: y^(7+8-6) = y^9
Qty B: 3y^9
We don’t know if y is positive or negative. Since it is raised to an odd power sign will be reversed if it is negative. So answer is D.
Qty B: 3y^9
We don’t know if y is positive or negative. Since it is raised to an odd power sign will be reversed if it is negative. So answer is D.
Retired Moderator
Joined: 10 Apr 2015
Posts: 6218
Given Kudos: 136
y^7y^8y^-6
[#permalink]
13 Sep 2019, 08:29
13 Sep 2019, 08:29
1
Carcass wrote:
Quantity A |
Quantity B |
\(y^7 \times y^8 \times y^{-6}\) |
\(3y^9\) |
Given:
Quantity A: \(y^7 \times y^8 \times y^{-6}\)
Quantity B: \(3y^9\)
Simplify:
Quantity A: \(y^9\)
Quantity B: \(3y^9\)
Now let's test some possible y-values
case i: if y = 0, we get:
Quantity A: \(y^9 = 0^9 = 0\)
Quantity B: \(3y^9=3(0^9)=3(0)=0\)
In this case, the two quantities are equal
case ii: if y = 1, we get:
Quantity A: \(y^9 = 1^9 = 1\)
Quantity B: \(3y^9=3(1^9)=3(1)=3\)
In this case, Quantity B is greater
Answer: D
RELATED VIDEO FROM OUR COURSE
