Number 8 please! ASAP need before 11!

Draw out the fraction then show how you would subtract 5 1/4

In the diagram, the ratio of ab to ae is (1/2) . what is the ratio of the length of to the length of ?

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.