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4 April, 22:08

A certain forest covers an area of

3400 km2. Suppose that each year this area decreases by 7%. What will the area be after 15 years?

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Answers (2)
  1. 4 April, 22:58
    0
    The general equation for the area of the forest after t years is

    A (t) = 4300 * (.93) ^t

    .93 since 7 percent decrease means 93 percent stays behind. Now plug in t=12

    A (12) = 4300 (.93) ^12=1799.964

    So about 1800Km^2 will be left after 12 years.
  2. 5 April, 00:09
    0
    3400 (0.93) ^t

    3400 (0.93) ^15 = 1144.782931 km2
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