What’s the midpoint between 1 + 9i and 5 - 3i

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 is the average rate of change for this function for the interval from x=2 to x=4 ?

The sum of these consecutive integers is equal to 9 less than 4 times the least of the integer. find the three integers