About how many times more intense is an earthquake that measures 8.4 on the Richter scale than an earthquake that measures 7.9 on the Richter scale? Recall that Richter defined the magnitude R of an earthquake of intensity I to be R = log I. (Round your answer to two decimal places.)

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Jermaine has t subway tokens. karen has 4 more subway tokens than jermaine. raul has 5 fewer subway tokens than jermaine. which expression represents the ratio of karen's tokens to raul's tokens

The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. according to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?