A student bikes to school every day. The 1st 10 minutes she bikes at 4mph and the next 15 minutes she bikes at 3mph. Write an equation that represents the total distance in miles she travels every day.

This summer the number of tourists in salem increased 4.5% from last years total of 426000. how many more tourists came to salem this summer

1. according to the internal revenue service, the mean tax refund for the year 2007 was $2,708. assume the standard deviation is $650 and that the amounts refunded follow a normal probability distribution. a. what percent of the refunds are more than $3,000? b. what percent of the refunds are more than $3,000 but less than $4,000? c. what percent of the refunds are less than $2,000?

Hi i’m not sure how to do question 20 if u could explain how to do it that’d b great