Devante left 3 hours after Melissa, traveling in opposite directions. He averaged 28 mph, while she averaged 47 mph. How long had each been driving when they are 291 miles apart? He drove for hours
She drove for hours.

With these: 18/36 = 1/? missing number change 1 5/8 to improper fraction. change 19/5 to a mixed number.

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.

Which is a graph of a proportional relationship?