Janelle ate 4/5 of her graham cracker. paul ate 3/5 of his graham cracker. the graham crackers were the same size. how much less of his graham cracker did paul eat than janelle ate?

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.

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?

The product of sin 30 degrees and sin 60 degrees is same as the product of