If the value of a in the quadratic function f(x) = ax2 + bx + c is 4, the function will. open down and have a maximum
open up and have a maximum
open up and have a minimum
open down and have a minimum

Whose conclusion is correct? choose all that apply. (two max) elijah emily edward esme

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.

Suppose that the price p (in dollars) and the weekly sales x (in thousands of units) of a certain commodity satisfy the demand equation 4p cubedplusx squaredequals38 comma 400. determine the rate at which sales are changing at a time when xequals80, pequals20, and the price is falling at the rate of $.20 per week.