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Bezzdna [24]
3 years ago
7

Find the 10th term of the geometric sequence 9,- 18, 36, ...

Geography
1 answer:
melamori03 [73]3 years ago
8 0

Answer:

90 i think

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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