Anne has already knit 86 centimeters of scarf, and can knit 22 centimeters each night. After 21 nights of knitting, how many centimeters of scarf will Anne have knit in total? Write and solve an equation to find the 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?