This is 61 points. find the first three terms of the sequence described by the following recursive formula: an = 3an – 1 + 2 where a4 = 20

a1=
a2=
a3=

see explanation

Step-by-step explanation:

Given the recursive formula

= 3 + 2 and a₄ = 20

Then working in reverse

3a₃ + 2 = 20 ( subtract 2 from both sides )

3a₃ = 18 ( divide both sides by 3 )

a₃ = 6

3a₂ + 2 = 6 ( subtract 2 from both sides )

3a₂ = 4 ( divide both sides by 3 )

a₂ =

3a₁ + 2 = ( subtract 2 from both sides )

3a₁ = - ( divide both sides by 3 )

a₁ = -

Hence

a₁ = -

a₂ =

a₃ = 6

6 hours 48 min

step-by-step explanation:

68÷5=13.6

13.6×30=408min=6 hours 48 min.

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