Homework Help: Math

Posted by Anonymous on Tuesday, October 23, 2007 at 7:52pm.

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 dont get these put I got the other 7 on the page.

Math - Ms. Sue, Tuesday, October 23, 2007 at 8:00pm
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 - Anonymous, Tuesday, October 23, 2007 at 8:12pm
how was it raised 25%???
Math - Ms. Sue, Tuesday, October 23, 2007 at 8:40pm
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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