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Faman39

A bakery charges $0.10 for a cookie that is 2 inches in diameter. If the price is proportional to the area, how much do they charge for an extra large cookie that is 10 inches in diameter? Assume that each cookie is shaped of a circle. $ 0.50 $ 1.00 $ 2.50 $ 12.50

  • one year ago
  • one year ago

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  1. Faman39
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    @tkhunny can you able to help me with this ?

    • one year ago
  2. tkhunny
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    Here's the important part: "If the price is proportional to the area" Translate that Price = k*Area or just P = k*A. After that, there MUST be some given information. "$0.10 for a cookie that is 2 inches in diameter" There it is. Now what?

    • one year ago
  3. Faman39
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    2.50 ?

    • one year ago
  4. tkhunny
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    Don't do that. You just went magically from a partially set up problem statement to a solution out of the air. Show your work and think it through. We have: P = k*A. and "$0.10 for a cookie that is 2 inches in diameter" Thus: 0.10 = k*pi*(2/2)^2 = k(pi) ==> k = 1/(10pi) Now what?

    • one year ago
  5. Faman39
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    I m kinda confuse, you are saying multiply 2 three times then divide with 10, right?

    • one year ago
  6. tkhunny
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    No. You must read this problem very carefully. You are given the DIAMETER, but the relationship is with the AREA. You must convert. Diameter/2 = Radius. pi*Radius^2 = Area. It was mean of the question writer to use '2', since there were already two '2's in the development.

    • one year ago
  7. Faman39
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    so 2 is it right?

    • one year ago
  8. Faman39
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    oh ok thank you @tkhunny for helping, i will try another way

    • one year ago
  9. tkhunny
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    Once we ahve determiend 'k', we are nearly done. k = 1/(10pi) (1/10pi)*pi*(10/2)^2 = 25/10 = 2.50

    • one year ago
  10. Faman39
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    It should second one?

    • one year ago
  11. Faman39
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    i guess not

    • one year ago
  12. tkhunny
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    I don't understand the question. You just made me work the whole problem. It's 2.50.

    • one year ago
  13. Faman39
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    I am sorry i could not get on beginning for network prob, now i went from up, where explain all, now i got. thanks so much @tkhunny !

    • one year ago
  14. Faman39
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    So sorry for troubling :( i m really terrible

    • one year ago
  15. tkhunny
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    No name calling! Just spend the time it takes. You'll get it.

    • one year ago
  16. Faman39
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    I am really sorry for everything :(

    • one year ago
  17. tkhunny
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    Read some material on "Direct Proportion". It's not impossible to learn it.

    • one year ago
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