Recent content by Asian Girl

What is the shape of snowball? i thought it's circle but my friend said it's a sphere.

my bad... hehehehe ( I've been here just couple months) Thanks so much all.

is this the right answer? - b ------------------ sf (a-bx) + sf (a-bx) so the domain of f ' is a-bx > 0

That how I did but when I posted it did not show square roof's symbol. Probably work's computer doesn't allow me to do it.

How do I use square roof symbol please?

too hard to read what you wrote... >> Sorry, i don't know to use those symbols. Would you show me please?

hmmm ... ok then i should do lim f(x) - g(x) = lim f(x) - lim g(x) = lim sf(a-b(x+h)) * sf(a-b(x+h)/ h sf(a-b(x+h)) * lim sf(a-bx) * sf(a-bx)/ h sf(a-bx) = lim a-bx+bh / h sf(a-bx+bh) * lim (a-bx) / h sf(a-bx) I don't know how to cancel h

Homework Statement Find the derivative from first principles, i.e, from the definition of f ' as a limit, for f(x)= [tex]\sqrt{}a-bx, where a and b are positive constants. What are the domains of f and f ' ? The Attempt at a Solution I solved: f(x) = \sqrt{a-bx} ---> f(x+h) =...

Good one. Thanks.

I haven't touched any math since 2000. Should I take calculus now or go back to pre cal to refresh my memory? I wasn't bad in math in high school or first year of college (1999) at all. Would it be fine if I can review by myself? any suggestion book to review? Thanks.

Is this Chem II? because I don't know "buffer solution". This problem is in ACS.

2 electrons

Another one: Water can be decomposed by the passage of an electric current according to the equation 2H2O (l) ---> 2H2 (g) + O2 (g) How many moles of H2 (g) can be produced from the passage of 4.8*10^21 electrons? I solved: 4.8*10^21 / 6.022*10^23 * 2 = 1.6*10^-2 mol What did I do wrong?

Which pair of solutions forms a buffer solution when equal volumes of each are mixed? a. 0.20 M HCl and .20 M NaOH b. 0.40 M HC2H3O2 and 0.20 M NaOH c. 0.20 M HCl and 0.20 M NH3 d. 0.40 M HCl and 0.20 M NH3 Thanks

Thanks