Please help me. Which expression is a difference of squares with a factor of 5x − 8?

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.

When you answer this can you explain

Joanie watched 1 out of three of a movie in the morning