22000. I believe it is the answer idk it could be wrong<span />
I think it is 989 or 899
*3 digit number*
*26 sum*
Last two digits are the same
Answer:
(14n - 42)*pi
Step-by-step explanation:
Circumference is 2 * pi * r. Since r in this case is 7n - 21, you can multiply r by 2 and pi, giving you (14n - 42)*pi