Byron is a wealthy tycoon who makes his money buying and selling stocks. this is an example of income

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.

Determine which expressions represent real numbers and which expressions represent complex number. asaaap! plis!

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.