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# To everyone out there: this is good practice I got

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Eternal Intern
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To everyone out there: this is good practice I got [#permalink]

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01 Aug 2003, 16:29
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To everyone out there: this is good practice

I got the right answers but you have to be fast.

Which of the following could be the exact value of n^4, where n is an integer?

1) 1.6 * 10 ^23
2) 1.6 * 10 ^ 21
3) 1.6 * 10 ^ 22
4) 1.6 * 10 ^23
5) 1.6 * 10 ^24

If s(t^3)(u^4)>0, then which of the following is positive

1) ST
2) SU
3) TU
4) STU
5) st^2
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Ride em cowboy

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02 Aug 2003, 08:27
1. 1.6 * 10 ^ 21
= 16 * 10^20
= 2^4 * (10^5)^4
= (2*10^5)^4

2. Did not understand the question

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Eternal Intern
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02 Aug 2003, 08:42
1) is not right. Even the 49ers club can slip up every now and then. Keep trying.

2) Which of the following is positive, sorry
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Director
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03 Aug 2003, 17:03
I didn't understand question 1. Can anyone tell me, what the

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Manager
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04 Aug 2003, 08:29
VT,

When I wrote (1), I meant the first part of the problem. If you see the expression, you will see that my choice was #2 (1.6 * 10 ^ 21).

It is asking for the expression which can be formatted in the form of n^4, where n is a integer. You will see why expression#2 (1.6 * 10 ^ 21) can be formatted into that form.

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Eternal Intern
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04 Aug 2003, 08:40
I can't take the test for you. Think about it prakunda, get back to me on my circumference problem the overlapping arc.

( x ) ^ 4
It cannot be one.
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04 Aug 2003, 09:47
VT,

Soory I confused you. The correct choice for the first part of the problem is the number (2) choice which is : 1.6 * 10 ^ 21

Because,

1.6 * 10^21
= 16 * 10^20
= 2^4 * (10^5) ^4
= (2*10^5)^4
= (200000)^4

Which is in the format n^4 where n is an integer. Here your n will be 200000. Mark option B - it is correct.

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Eternal Intern
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04 Aug 2003, 19:56
E is right for one, A for two.
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04 Aug 2003, 20:25
VT,
If (e) is the right answer then 1.6 * 10 ^24 can be expressed as n^4. Which is wrong even if ETS says it. Because, if you take
1.6 * 10 ^24
= 16 * 10^23
= 2^4 * 10 ^ 20 * 10^3
= 2^4 * (10^5)^4 * 1000
= (2*10^5)^4 * 1000

which clearly is not in the form n^4. If (E) is the answer, please recheck the question. Thanks

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Eternal Intern
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04 Aug 2003, 21:39
I swear on ETS's bible E is right.

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05 Aug 2003, 00:19
stolyar wrote:
Q1 (2)
Q2 (1)

Stolyar,

In the second question, both ST as well as ST^2 are positive. Why did you choose ST ?

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05 Aug 2003, 01:23
ST^2 or (ST)^2

my rationale is to terminate even powers

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05 Aug 2003, 02:48
stolyar wrote:
ST^2 or (ST)^2

my rationale is to terminate even powers

I'm sorry I didn't get that. Could you elaborate please?

Thanks!

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05 Aug 2003, 03:09
s(t^3)(u^4)>0

(t^2)(u^4) is nonnegative. Terminate it.

st>0

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05 Aug 2003, 03:09
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