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anonymous

  • one year ago

Plz help...I'll be ur fan................ Blake goes running for 10 minutes on Sunday. Every day he doubles his running time. If he continues this pattern, how many minutes will he run on the 7th day? I'm confused about which formula I should use: f(n) = f(1) • r^(n−1) or an = a1 • r^(n−1) are these even the correct formulas for this question????

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  1. anonymous
    • one year ago
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    @moazzam07

  2. rajat97
    • one year ago
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    yes those are the correct ones and both say the same thing if you use the second one, a1=10, r=2 and n=7

  3. anonymous
    • one year ago
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    So that means that on the 7 day he would run 640 minutes???? @rajat97

  4. rajat97
    • one year ago
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    i'm calculating!

  5. rajat97
    • one year ago
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    yes you are right

  6. princeharryyy
    • one year ago
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    what do you mean by doubling

  7. rajat97
    • one year ago
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    no that's not right @princeharryyy has got it

  8. princeharryyy
    • one year ago
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    day 1 =10 =10 day2 = 2*10 =20 day3 = 2*2*10 =40 ..... day7 = (2^6 )* 10 = 64*10 =640minutes @rajat97 and @plzzhelpme

  9. princeharryyy
    • one year ago
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    and that was right @rajat97

  10. anonymous
    • one year ago
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    wait........it was right..

  11. rajat97
    • one year ago
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    oh yeah! silly me!

  12. princeharryyy
    • one year ago
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    yeah! silly you! that was right.

  13. anonymous
    • one year ago
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    ok thanks alot... what formula would u use for this question?? Alex studies for an exam for 50 minutes on Monday. Every day he increases his study time for 5 minutes. If he continues this pattern, how many minutes will he study on the 7th day?

  14. rajat97
    • one year ago
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    this is an arithematic progression

  15. rajat97
    • one year ago
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    you can use a1 + (n-1)d

  16. rajat97
    • one year ago
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    here d=5, n=7and a1=50

  17. princeharryyy
    • one year ago
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    50, 50+5, 50+5+5, 50+5+5+5, ..... and so on

  18. anonymous
    • one year ago
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    and that would be 80 minutes on day 7 right?

  19. rajat97
    • one year ago
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    yup

  20. anonymous
    • one year ago
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    ok....thanks alot:* :* :*

  21. princeharryyy
    • one year ago
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    * :* :*

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