**Quote:**

On the Richter scale, which measures the total amount of energy released during an earthquake, a reading of x-1 indicates one-tenth the released energy as is indicated by a reading of x. On that scale, the frequency corresponding to a reading of 9 is how many times as great as the frequency corresponding to a reading of 5?

See if Richter scale reading goes from X to X-1 implies 1/10 right (as per the question)

so if Richter scale reading goes from X-1 to X it will be 10 right

So if Richter scale reading goes from 5 to 6 it will be 10

Similarly if Richter scale reading goes from 6 to 7 it will be 10

and if Richter scale reading goes from 7 to 8 it will be 10

and if Richter scale reading goes from 8 to 9 it will be 10

so it will from 5 to 9 i.e 6,7,8,9 = 10*10*10*10 = 10^4

You only need to count it on your fingers no need to use pen i.e. 6,7,8,9 answer is 10^4

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