How many significant figures are in 0.0624000?

The sum of these consecutive integers is equal to 9 less than 4 times the least of the integer. find the three integers

Using elimination, what is -4x+2y=-12 4x+8y=-24

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