Yahoo Answers is shutting down on May 4th, 2021 (Eastern Time) and beginning April 20th, 2021 (Eastern Time) the Yahoo Answers website will be in read-only mode. There will be no changes to other Yahoo properties or services, or your Yahoo account. You can find more information about the Yahoo Answers shutdown and how to download your data on this help page.

Trending News

Promoted
Topaz
Lv 5
Topaz asked in Science & MathematicsMathematics · 6 years ago

Math questions: logarithms?

Update:

1. The population of a city is decreasing at the rate of 0.3% annually. How long does it take to reduce 2% of its population?

2. The stock depreciates x%, and then appreciates 20%. Will you get back your money exactly (i.e., $1 if

you invest $1)? What is the value of x?

I have no idea how to set these problems up. I know we have to use logarithms to solve them. Can someone help me out? Thank you!

1 Answer

Relevance
  • JB
    Lv 7
    6 years ago

    1. (.997)^n = .98, so taking logarithms n log(.997) = log(.98) so n = log(.98) / log(.997) = 6.72 years, or about 6 years and 9 months.

Still have questions? Get your answers by asking now.