Lee ran a mile in 7 1/3 minutes. His friend ran the same mile in 8 5/9 minutes. How many minutes faster did lee run?

Which property was used to simplify the expression? 3c+9 +4c=3c+4c+9

Ze trinomial x2 + bx – c has factors of (x + m)(x – n), where m, n, and b are positive. what is ze relationship between the values of m and n? explain how you got ze answer

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?