Which property is represented 7(t+u)= 7t + 7u

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

Answer for 10 points show work you guys in advanced < 3

What is the approximate value of  q  in the equation below? –1.613–1.5220.5853.079