This organization began in 1863 to protect human life and health wherever there is need. The United States has a national program with offices in Washington, D. C. Which non-governmental organization does this statement describe?

other answer is correct. i had used the radius of the radius somehow. a website:

an = 22 + (n-1) *6

110 seats

step-by-step explanation:

an=a1+(n-1)(d)

a1 = 22   this is the first item in the sequence

d =6   this is how the sequence goes up

a)   an = 22 + (n-1) *6

b) a12 = 22 + (12-1) *6

    a12 = 22+11*6

  a12 = 22 +88

  a12 = 110