What value must be added to the equation in order to complete the square in the following quadratic equation?

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

Two lines parallel to the same plane are parallel to eachother

An automated water dispenser fills packets with one liter of water on average, with a standard deviation of 5 milliliter. the manual says that after a year of operation the dispenser should be tested to see if it needs recalibration. a year later a number of filled packets are set aside and measured separately. it is found that the average packet now contains about 0.995 liters. does the dispenser need calibration? explain your answer.