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°

step-by-step explanation:

if you want to solve percent error follow these steps.

1. subtract the accepted value from the experimental value.

2. take the absolute value of step 1.

3. divide that answer by the accepted value.

4. multiply that answer by 100 and add the % symbol to express the answer as a percentage.

if you want to solve percent of change just do this.

1. work out the difference (increase) between the two numbers you are comparing.

2. divide the increase by the original number and multiply the answer by 100. if your answer is a negative number then this is a percentage decrease.

hope this : )

step-by-step explanation: