Can anybody explain how to find range on a data set?

Janet is mixing a 15% glucose solution with a 35% glucose solution. this mixture produces 35 liters of a 19% glucose solution. how many liters of the 15% solution is januet using in the mixture? a. 25 liters c. 28 liters b. 7 liters d. 10 liters

What does the sign of the slope tell you about a line?

Which type of graph would allow us to quickly see how many students between 100 and 200 students were treated?