Which of the following is the product of the rational expressions shown
below?
3/x+7 x 4/x

Let w=23 . what is the value of w + 45 ?

Aline on the wall and a line on the floor are skew. always, sometimes, or never?

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.