Need assistance with finishing this formula, can someone please guide me on what I am doing wrong

On an airplane there are two seats on the left side and three seats on the right side there are 90 seats o the right side of the plane

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 is the point-slope equation of a line with slope -5 that contains the point (6,3)