Jonathan needs 70 L of 50 proof alcohol solution. He has 30% solution and a 80 solution available how many liters of the 30% solution and how many liters of the 80% solution would he mix to make 50% solution?

Sanya noticed that the temperature was falling at a steady rate of 1.4 degrees every hour from the time that she first checked her outdoor thermometer. by 6 a.m., the temperature had fallen 21 degrees. which expression can you use to find how many hours earlier she had first checked the thermometer?

700 miles the train takes 5 hours to a travel the distance at what unit rate is the train traveling?

The graph below shows the line of best fit for data collected on the number of cell phones in cell phone cases sold at the local electronic store on four different days