Round off 11.25 to the nearest hundred to the nearest cent

Extra points! find the missing dimension! need asap

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

#7. m is the midpoint of pq, the diameter of the circle o is 13in. and rm = 4in. find pm find pq