Can someone please help me out here

Find the value of x for which line a is parallel to line b

Aye asap pls ! markin da brainiest too ! btw da step choices are all add, distribute, divide, n subtract

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