raulmaldonadomtz wrote:

Hi guys, Can some one explain step by step this problem, because i didn't understand the book explanation.

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 corresponding 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?

A) 5

B) 50

C) 10 with exponent 5

D) 5 with exponent 10

E) 8 with exponent 10 - 3 exponent 10

I hardly understand what they are asking for.

Thanks

Scale - Corresponding intensity

intensity of (n +1) - 10(intensity of n)

intensity of 8 - x(intensity of 3)

We need to find out x ?

8 - 10(intensity of 7)

so we go down to 3 we are just multiplying each time by 10. So in this case the power of 10 will be 8-3 = 5

x = 10^5 <--- C