Answer:
10.63
Step-by-step explanation:
Answer:

Step-by-step explanation:
The formula of a circumference of a circle:


Answer:
Step-by-step explanation:
Answer:
3(8+2a)
Step-by-step explanation:
You just want to simplify the equations to see if they equal 6a+24, which in this case 3(8+2a) does. The other two equal something else, hopefully this helps :)