How many ounces of a 30% alcohol solution and a 39% alcohol solution must be combined to obtain 45 ounces of a 38% solution?

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?

How many square centimeters of wrapping paper will be used to wrap the shoe box?

Pls math have no ideamultiply and simppify. 2x^2y^3z^2 • 4xy^4x^2