The price of computers has fallen by 2/5. if the price of a computer was originally $10,275, by how much has the price fallen?

How to choose the sign of the radical in the denominator of the formula for the distance from a point to a line.

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.

Find the solution of this system of equation -7x+y=-20 9x-3y=36