How many gallons per day of a 12% chlorine solution would be required to provide a dosage of 2 mg/l to a well that produces 200,000 FPS?

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?

The measure of angle 0 is 600 degrees

In a survey of 1015 adults, a polling agency asked, "when you retire, do you think you will have enough money to live comfortably or not. of the 1015 surveyed, 534 stated that they were worried about having enough money to live comfortably in retirement. construct a 90% confidence interval for the proportion of adults who are worried about having enough money to live comfortably in retirement.