Anyone up rn and wanna talk please

Susie ran a race. she ran 55 miles an hour, and the race took her tt hours to complete.

Earth's atmosphere is unique among the planets and is able to support life because it contains a large amount of a) oxygen b) helium c) methane d) carbon dioxide

How many liters of 60% alcohol solution should be added to 40 liters of a 20% alcohol solution to make a 50% solution?