A circle has a circumference of 7850 units. What is the radius?

The radius is approximately 1249 units.

Step-by-step explanation:

Hello!

The formula for the circumference of a circle of radius r is C = 2πr.  We want to find r when the circumference is 7850 units.  To do this, solve C = 2πr for r first:

Dividing both sides of the above equation by 2π, we get:

7850 units

= approximately 1249 units.

       2π

The radius is approximately 1249 units.

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