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# Help with Geometric Sequence ?

In 1990 the population of Canada was approximately 26.6 million. The population projection for 2015 is approximately 38.4 million. If the projection is based on a geometric sequence, what would be the annual growth rate?

### 1 Answer

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- Wayne DeguManLv 73 months ago
At the start we have 26.6

After one year we have 26.6r

After two years we have 26.6r²

so, in 2015, which is 25 years on we have:

26.6r²⁵ = 38.4

so, r²⁵ = 38.4/26.6 = 1.443609023

Then, r = ²⁵√(1.443609023) = 1.014794217

Hence, annual growth is 1.48%...to 3 s.f.

:)>

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