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Math

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3 Questions

1. Explain what "any multiple of 9 returns to 9" means. The ancient Chinese found the number 9 magical because of this.

2. The dry cleaners raised the price of a sports coat from $ 4 to $5. The same percent increase was applied to cleaning a jacket. The old cost for cleaning a ajacket was $10. What is the new cost? Show your work.

3. If 2(exponent is n)=8 and 3 (exponent is m)=9 what is the value of n+m?
If 2 (exponent is x) =0.0625, then whatis the value of x?


Thanks, i just don't get these put I got the other 7 on the page.

  • Math -

    1. When you add the digits in multiples of 9, the answer is 9.
    9, 18, 27, 36, 45, 54, 63, 72, 81, 90, (99), 108, 117, etc.

    2. The price of cleaning the sport coat was raised 25%. To find how much cleaning a jacket costs now, multiply .25 by $10.

  • Math -

    how was it raised 25%???

  • Math -

    1/4 = .25 = 25%

    25% of $4.00 = $1.00.

    The cleaners raised the price $1.00 from $4.00 to $5.00.

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