What percent of 91 is 79

Which of the following is the result of expanding the series

What unit of been sure would be appropriate for the volume of a sphere with a radius of 2 meters

What will be the end result for the taxpayer who filed his federal income tax return using the 1040ez form shown belowa he'll owe $173b he'll receive a refund of $173c he'll owe $3921d he'll receive a refund of $3921