Sunday
May 1, 2016

# Posts by Reen

Total # Posts: 34

Algebra
How do you graph the equation of -1.2x + 2y= -4 and y = 0.6x + 8
April 28, 2013

algebra
how do you do the linear equation y + 9 =1/5x and 45 - 3y = 15x
April 28, 2013

algebra
the line "l" passes through the point P=(1,-1,1) and has a direction vector d=[2,3,-1], for the following plane Pl, determine whether l and P is parallel, perpendicular, or neither. a) 2x + 3y - z = 1 could you tell me also how it would differ if it was parallel or ...
January 12, 2011

chemistry
I'm assuming mass? I'm not sure.
September 25, 2010

chemistry
Pure acetylsalicylic acid has a melting point of 135.0 - 135.5 (degrees Celsius). What would you expect for the melting point is this was mixed as a 50:50 mixture with pure benzoic acid (melting point 121 - 122)? Explain.
September 25, 2010

chemistry - buffers
what mass of sodium acetate should be dissolved in 1.00L of acetic acid, 0.150M concentration, in order to produce a buffer with pH = 4.5?. Ka of CH3COOH = 1.8x10^-5
April 12, 2010

buffers
thanks a lot :D
March 3, 2010

buffers
thanks. so for this question is the pH 3.70?
March 3, 2010

buffers
we havn't learnt that equation.
March 3, 2010

buffers
9.00mL of 1.10M CH3COOH and 1.00mL of 0.900M CH3COO- what is the pH?
March 3, 2010

chemistry
determine the pH of 10.00mL or 0.100M HCl after adding 10.00mL of indicator solution. (i think this is supposed to be a buffer problem)
March 2, 2010

Chemistry
a few drops of NaOH are added to a sample of the unknown. A blue precipitate appears. Next, approximately 1mL of ammonia, NH3, is added. The precipitate dissolves, but the solution remains blue. Which ion is present. Explain
January 24, 2010

percipitate and colour
a few drops of NaOH are added to a sample of the unknown. A blue precipitate appears. Next, approximately 1mL of ammonia, NH3, is added. The precipitate dissolves, but the solution remains blue. Which ion is present. Explain
January 24, 2010

sigma sums
evaluate: n sigma i=1 3/2^(i-1)
November 12, 2009

sigma notation
find the value of the sum n sigma i=1 (2-5i)
November 12, 2009

calculus
sorry, i meant what is the antiderivative of f'(x) = (x^2-1)/x
November 8, 2009

calculus
f'(x) = (x^2-1)/x
November 8, 2009

calculus
im sorry. i think it was because i wrote it wrong. i meant f'(x) = (x^2-1)/x
November 8, 2009

calculus
i just didn't understand how you got to that point. And i havn't learned integrals yet. I was hoping someone else could give me a different perspective as to how to answer it.
November 8, 2009

calculus
find f(x) f'(x) = (x^2-1)/x^(-1)
November 8, 2009

antiderivates
find f(x) f'(x) = (x^2-1)/x^(-1)
November 8, 2009

antiderivatives
find the equation of f(x) f''(x)= 2 + x^3 + x^6
November 8, 2009

calculus
P /|\ / | \ / | \ on this side there is an / | \ arc with A(θ) in the / | \ middle. the B(θ) /θ | B(θ)\ triangle is not equal O -------------- R to the θ triangle. Q the figure shows a setor of a circle with central angle theta. Let A(θ) be the ...
November 8, 2009

limits
lim as x-> infinity sec^2(1/x)
November 7, 2009

implicit differentiation
what is the derivative of ln(y) = x
November 1, 2009

calculus
what is the derivative of y = (1/2)xln(x)
November 1, 2009

chemistry
A sample of the primary standard, Potassium hydrogen phthalate, weighing 0.3589g requires 14.96mL of NaOH solution for neutralization. calculate the molarity of the NaOH solution.
October 21, 2009

calculus - limits
limit as x approaches infinity; tan^(-1) (x^2 - x^4) any help is appreciated =D
October 18, 2009

Simplify the expression: cos(2tan^(-1)x) any help is appreciated =D
September 22, 2009

try isolating for y
September 22, 2009

calculus
solve for x: a)e^x=5 b) lnx=2
September 13, 2009

math
isolate t: 300(1.o5)^t = 1000(0.92)^t
May 24, 2009

word unscramble
its two words the letters are hemctbenwee the second word is four letters
September 28, 2006

word unscramble
its two words the letters are hemctbenwee
September 28, 2006

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