Write a letter to a sick friend who missed class today. explain how to solve decimal problems using addition, subtraction, multiplication, and division.

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

How many verticies does a triangular prims have

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?