X^4-30x^2+125=0 solve the equation by making an approproate substitution

Do 12/14 and 8/10 have the same value? explain your answer.

What situation is an example of an observational study

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.