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Find the distance between (7,-6) and (-3,-9)

Solve 4 ln x=2ln25 a) x=5 b) x=25 c) x=625

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