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 Post subject: Wording - math question (OG 12, 98)Posted: Mon Nov 16, 2009 3:29 pm

Joined: Thu Oct 01, 2009 11:21 am
Posts: 3
what is the testmaker asking me here, i.e.
how to express their question in math terms? thank you.

"On a scale that measures the intensity of a certain phenomenon, a reading of N+1 corresponds to an intensity that is 10 times the intensity corresopnding to a reading of N.
On that scale, the intensity corresponding to a reading of 8 is how many times as great as the intensity corresponding to a reading of 3?"

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 Post subject: Re: Wording - math question (OG 12, 98)Posted: Wed Nov 18, 2009 8:18 pm

Joined: Thu Feb 12, 2009 6:32 pm
Posts: 497
Think of it this way.
If a reading of N is received, we have an intensity of N.
If a reading of N+1 is received, we have an intensity of 10N
If a reading of N+2 is received, then, we have an intensity of 100N
N+3 means 1000N
The number added to N refers to the number of 0's on the power of 10.
Thus, a reading of N+8 will be 10*N^8
and a reading of N+3 will be 10*N^3
This means that n+8 is 10^5 times n+3.

(You can substitute 1 for N and see this without the variable.)

Veritas Help

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