Due rn Please help for both of these questions! its due soon! i'll mark brainlist

Using the quadratic formula find the zeros of the given polynomial -5x^2+3x-11

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 perimeter of a stage is 116 feet. it is 17 feet wide. how long is it?