Can someone please help me.

What is the value of the expression below? (81^2)^1/8

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?

The blue lake trail is 11 1/2 miles long.grace has hiked 1 1/2 for 2 hours. how far did she from the end of the trail