-3 + (-7)
Someone give me an explanation but use another example to show me

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.

I'm a polygon i have no parallel lines i am formed 3 line segments i have one right angle two of my angles are angles what am i

286 divided by 457.6 what is the quotient?