The ratio of a to b is 2 to 3, where a and b are positive. if x equals a increased by 50% of a and y equals b decreased by 50% of b, what is the value of x/y?

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.

Inez has a phone card. the graph shows the number of minutes that remain on her phone card a certain number of days.

Simplify. 4+3/7x-2-2/7x a. 2-5/7x b. 6-1/7x c. 2+1/7x d. 6+5/7x