Given the ellipse with equation (x-2)^2 over 16 plus (y-4)^2 over 9 =1 what are a, b,x1, and y1

(40 points) i need some . an answer definition is appreciated as well.

The product of two negative rational numbers is always zero sometimes zero never zero

How many liters of peroxide should be added to 12 liters of an 8% peroxide solution so that the resulting solution contains 16% peroxide?   original added new amount of peroxide 0.96 liters x 0.96 + x amount of solution 12 liters x 12 + x 0.18 liter 1.14 liters 1.92 liters 2.10 liters