Answer:
3y +9 = perimeter
Step-by-step explanation:
Answer:

Step-by-step explanation:
Angles in a straight line add up to 180°.


Angles in a triangle add up to 180°.


Answer:
The answer is 15
Step-by-step explanation:
hope this helps
Answer:
Original value: 5.69
Value (with 10 decimal places): 5.69