Hello, please I will kindly ask if you take your time to help me with this math question

The answer to your question is below

Step-by-step explanation:

9)

They are supplementary angle. The sum of supplementary angles is 180°.

                   b + 50 = 180

-Solve for b

                    b = 180 - 50

                    b = 130°

10)

They are vertical angles. Vertical angles measure the same

                    b = 43°

11)

They are vertical angles. Vertical angles measure the same.

                    b = 73°

12)

They are supplementary angles. The sum of supplementary angles is 180°

                  b + 35 = 180

-Solve for b

                  b = 180 - 35

                  b = 145°

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

idk

step-by-step explanation: