Chapter 1 Text work review

6. 

a) t₁ = 6, t₄ = 33, d = ? t₂ = ? t₃ = ?

   t₄ = t₁ + 3d --> 33 = 6 + 3d --> 3d = 27 --> d = 9

    t₂ = t₁ + d = 15      t₃ = t₂ + d = 24

b) t₁ = 8, t₄ = 41, d = ?, t₂ = ?  t₃ = ?

   t₄ = t₁ + 3d --> 41 = 8 + 3d --> 3d = 33 --> d = 11

   t₂ = t₁ + d = 19     t₃ = t₂ + d = 30

c) t₁ = 42, t₄ = 27, d = ?, t₂ = ? t₃ = ?

   t₄ = t₁ + 3d -->