HELP, i’m confused and don’t know how to do this

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.

Sove the equation 6c + 11 = 2c + 59

At school 460 of the students walk to school the number of students who take public transit is 20% of the number of students who walk. how many students take public transit