Tuesday
September 23, 2014

Posts by sandrine


Total # Posts: 6

chemistry
i have difficulty in this question. any help would be appreciated. 1) What pH corresponds to each of the following: (a) (H+)=0.35M,(b)(OH^-)= 6.0*10^-6M. (d)(H+)= 2.5*10^-8M?
January 6, 2010

science
why eating carrots is important for good vision?
January 6, 2010

biology
why eating carrots is important for good vision?
January 6, 2010

Algebra
I'm cubing the binomial (3x+2)^3. THe answer is 54x^2 according to my book, however I got different answers each time. Once I got 74x^2. How do I get 54x^2? I know the order of operations but when I followed it, the boo answer was not the one I got.
September 16, 2009

Algebra
How come when you find the square of the binomial (2x-5y)^2, the answer is 4x^2-20xy+25y^2 (according to my book)? I would think that the middle term, 2(2x-5y) would be 4x-10y, but my book says it is -20xy. But I thought you 2x and 5y were separate terms so you can't ...
September 16, 2009

Algebra
I multiplyed x^2-2x+2 times x^2+2x+2. The book suggested the order this be done in as: x^2(x^2-2x+2) then 2x(x^2-2x+2) then 2(x^2-2x+2), with the result being x^4+4. However, I wondered if this could be done in reverse. So I multiplyed x^2(x^2+2x+2), then -2x(x^2+2x=2) then 2(...
September 16, 2009

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