My sister is 15 years old . My brother says that his age minus eleven is equal to my sisters age. How old is my brother ?

For the following geometric sequence, find the recursive formula. {-80, 20, -5, } i need : ')

The value of the expression 16-^3/4 8 1/8 -6 6 1/40 1/64

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?