PLZ HELP ANSWER THIS QUESTION

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.

The square root of 9x plus 7 plus the square rot of 2x equall to 7

Which expression do you get when you eliminate the negative exponents of 4a^2 b^216a^-3 b