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loganlatimer2001
17.10.2019 •
Mathematics
Acertain forest covers an area of
3400 km^2. suppose that each year this area decreases by 7%. what will the area be after 15 years?
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Ответ:
1144.78 Km^2
Step-by-step explanation:
If the forest covers an area of 3400 km^2 and it decreased by 7%, the new area covered after a year will be equal to 3400 less the product of 3400 and 7%
= 3400 - 7% * 3400
= 3400 (1 - 0.07)
After the second year, the area becomes
= 3400 (1 - 0.07) - 7% * 3400 (1 - 0.07)
= 3400 (1 - 0.07)(1 - 0.07)
= 3400 (1 - 0.07)²
Following this pattern, the area after 15 years
= 3400 (1 - 0.07)^15
= 1144.782931 km^2
Ответ:
22
Step-by-step explanation: