diananaranjo661 diananaranjo661

19-03-2020
Mathematics

contestada

What’s the 10th term of the geometric sequence 9,-18,36

Respuesta :

shakylaguy shakylaguy

31-01-2021

Answer:

90 i think

Step-by-step explanation:

a^{1}=9

a^{2}= 18

d = ?

a^{10}=?

a^{2} =a, + (n-1) d

18 = 9 + (2-1) d

d=18-9

d=9

a ^{10}= a^{1} + (n-1)d

a ^{10}= 9 + (10-1) (9)

a ^{10}= 9+ (9 x 9)

a ^{10}=9+8^{1}

a^{10} = 90

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