3 years ago

Answer for 23 plz plz plz

Mathematics

1 answer:

den301095 [7]3 years ago

3 0

Answer:

A₍ₙ₎ = - 74 + (n-1) x 6

Step-by-step explanation:

A₍ₙ₎ = A₍₁₎ + (n-1) x d

A₍₁₈₎ = 28 = A₍₁₎ + 17 x d ..... (1)

A₍₄₀₎ = 160 = A₍₁₎ + 39 x d .....(2)

(2)-(1) 132 = 22d

d = 6

A₍₁₎ = 28 - 17 x 6 = -74

formula: A₍ₙ₎ = - 74 + (n-1) x 6

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