If I have a model car that is 2 inches and my remote control card is 12 inches. What is the scale factor?

Which expression is equivalent to 2x^2+7x+4?

I'll give brainliest if you answer right : )

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.