2n+5...a couple is two people so you need to multiply the number of couples, n, by 2 to get the total number of dancers. Then add the total number of organizers.
5 35/36, solving steps attached below
You would half to take 8×(8×pi r squared)
I agree with you on this problem. It is A. If that is the final answer, the negative exponent must be flipped in order to be positive. According to the equation, it is not positive so it is not a simpflied polynomial.
Answer: I'm pretty sure that it´s C but Im not sure.
Sorry if that's wrong.
