HELP ME PLEASE

The multiplication property of zero states that the product of any number and 0 is 0. what must be true about either a or b to make ab=0

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

The dimension of the rectangular pool shown below are 40 yards by 20 yards