Trapeziod JKLM with vertices J(-4,3), K(-2,7),L(2,7)and M(3,3) reflected over the given line

What is f(3) for the quadratic function f(x)= 2x^2+ + x - 12

Enter the number of complex zeros for the polynomial function f(x) = x 4+ 5x² +6

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.