Aplanes trajectary from toronto to montreal is represented by this equation h=-2.5t^2+200 h= hieght of flight and t= time of flight. how long would the flight from toronto to montreal last?

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