Wednesday
June 19, 2013

# Posts by nancy

Total # Posts: 606

math
1-How many three digit numbers are even? 2-how many three digit numbers are not even and do not divide by 5 ?

math
How many three-digit numbers are even ?

math
How many four-digit numbers divide by 5 ? Note:0001 is considered a 1-digit number .

math
Suppose a license plate requires three letters ,followed by three digits.how many license plates are there if the letters are all different and the digits are all different

chemistry
Determine the final temperature when 10g of steam at 100C mixes with 500g of water at 25C. I have 4.184x 10(100-x) + 40700 x 10= 500 x (x-25) x 4.18. The book has 10/18 instead of 10 on left hand side of equation. Why??

chemistry
Find the number of disintegrations per minute emitted by 1.1 mol of 232-Th in 1 min. The half-life of 232-Th is 1.4 x 1010 year I was able to do this with the following technique: 1.1 x 6.022 x10^23 =6.62x10^23 1.4x10^10=7.358x10^15 minutes I think then it is 6.62x10^23 x 7.3...

algebra/logs
I don't understand this problem: (1/2)n = 0.015625 n log 0.5 = log 0.015625 n = log 0.5 / log 0.015625 n = 6 When I plug log .5 into the calculator it gives .3010 and when I plug .15625 to the calculator it is -1.806 and that would be -.3010/-1.806 =.1666. How is the answ...

algebra
solve the equation 5x^2=19x+4 X=

algebra
Find the number of decibels for the power of the sound. round to the nearest decibel. A rock concert, 5.35x 10^4 watts/cm^2

chemistry
I think I've got it by looking through the balanced equation. It is just hard to understand the NA repeated twice on the right side of the equation.

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