What’s h ? and how do you solve it and show the steps

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.

What value of x is in the solution set of 4x – 12 s 16 + 8x?

Arectangle has a length of 6cm by 8cm what is the length of a diagonal of the rectangle