Question

interpole seis meios aritmeticos entre -8 e 13

Answer 1

a₁ = -8
a₈ = 13
r = ?

a₈ = a₁ + 7r
13 = -8 + 7r
7r = 13 + 8
7r = 21
r = 21/7
r = 3

P.A. (-8, -5, -2, 1, 4, 7, 10, 13)

Answer 2

Boa tarde!

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Dados:

a1→ -8

n → 2+6 = 8

r → ?

an → 13

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Em busca da razão da P.A :

An=a1+(n-1)·r

13=-8+(8-1)·r

13=-8+7r

13+8=7r

21=7r

r=21/7

r=3

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P.A (-8, -5, -2, 1, 4, 7, 10, 13)

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Att;Guilherme Lima