How do
multiply out and simplify 10(2x-1)-20x?

If f(x)= sqrt4x+9+2, which inequality can be used to find the domain of f(x)?

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

Atrain leaves little? rock, arkansas, and travels north at 90 kilometers per hour. another train leaves at the same time and travels south at 80 kilometers per hour. how long will it take before they are 680 kilometers? apart?