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dannielle

  • 4 years ago

At the end of the first day, 7 weeds appear in your neighborhood park. Each day, the number of weeds increases by four times. How many weeds will be in the park at the end of 14 days?

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  1. mia0bbb
    • 4 years ago
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    7 weeds x 4 x 14 days

  2. lilg132
    • 4 years ago
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    7 + (14 - 1) * 4

  3. lilg132
    • 4 years ago
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    59 weeds in the park at the end of 14 days

  4. dannielle
    • 4 years ago
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    it cant be, the answer choices are 71 626,349,395 392 35,456,231

  5. mia0bbb
    • 4 years ago
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    392 is the answer

  6. mia0bbb
    • 4 years ago
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    because 7 x 4 x 14 = 392

  7. lilg132
    • 4 years ago
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    oh wait we need to work out the sum

  8. dannielle
    • 4 years ago
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    yeah, but im feeling there is a formula to it or something, my teacher wouldnt make it that easy

  9. mia0bbb
    • 4 years ago
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    14( 7 x 4 )

  10. lilg132
    • 4 years ago
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    answer is 626349395

  11. lilg132
    • 4 years ago
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    i'm not sure of the formula but what i do know is we have 7 weeds on the first day and it multiplies by 4 each day and you do it 14 times and add all the figures up giving you 626349395

  12. dannielle
    • 4 years ago
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    alright, that does make sense, thank you !

  13. lilg132
    • 4 years ago
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    your welcome i will try and look for the formula for you

  14. dannielle
    • 4 years ago
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    thank you (:

  15. mathmate
    • 4 years ago
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    Use the compound interest formula: 7(4^14-1)/(4-1)=626349395 which is equivalent to 7(1+4+4^2+...4^13)

  16. lilg132
    • 4 years ago
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    thats what i was looking for :)

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