How does the sum of the sides determine if a shape is a triangle?(In other words, when is a shape with 3 sides not a triangle?)

stop cheating

step-by-step explanation:

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

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you have to find the same variables -3n - 5n so this would be -3n +(-5n) which equals -9n