A and B are two similar solids. 15 cm
The volume of A is 400 cm?
Work out the volume of B.

a is the right answer

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

umm you say your want to . but you do know that this is the mathematics.  

o~o