Find the standard equation of the sphere with the given characteristics. center: (-1, -7,3) radi radius: s

Which type of graph would allow us to compare the median number of teeth for mammals and reptiles easily

What is the measure of angle x? 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?