3. Use the relationship between 21 and 25 to decide whether the top and middle shelves are parallel.

4. Is the bottom shelf parallel to the top shelf? Explain.

5. Is the bottom shelf parallel to the middle shelf? Explain.

Angle between 21 and 25 are co interior angle

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 : )

d is the answer

step-by-step explanation: