Posted by Golkhadi nep on Friday, June 4, 2010 at 5:36pm.
In the summer of 2008 the population of cuckoos in an area was estimated as 560 pairs. If the numbers returning are declining at 4% each year, calculate
(a) the number of pairs of cuckoos in the area in the summer of 2009;
(b) the number of pairs of cuckoos in the area in the summer of 2020
- Math - Ariel, Friday, June 4, 2010 at 5:48pm
so my guess is that you would start with what ya got
(continue til you get to 2020)
- Math - MathMate, Friday, June 4, 2010 at 7:04pm
If the population declines at 4%, it means that the surviving population is 96% of the previous year.
In the summer of 2008, there were 560 pairs. So in the summer of 2009, there were 560*(96/100)
= 537.6 pairs (theoretically)
= 538 pairs
In the summer of 2009, the population declined again to 96% of the theoretical population of 2008, thus
=516.1 pairs (theoretically)
= 516 pairs (rounded)
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