(15 + 6) divided by 3

15

Step-by-step explanation:

You add what’s in the parentheses first then you divide The sum of 15+6 by 3

the answer would be 0.15 which is the same as 15

water molecules will move from the side of higher water concentration to the side of lower concentration until both solutions are isotonic. at this point, equilibrium is reached. in an isotonic solution, the flow of water in and out of the cell is happening at the same rate.

hope this < 3