Math problems with 24 divided by 4

Which math sentence can be used to determine if the triangle is a right triangle?

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.

Michael is training for a marathon. in his first week he plans to run 8miles. what path should he take