Aboard is 20 feet long is cut into two pieces. the difference between the lengths of the two pieces is 3 feet. how long is each piece?

11 feet 6 inches and 8 feet 6 inches

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

it is 32.5

i hope i could u.