Friday

May 22, 2015

May 22, 2015

Total # Posts: 255

**Chemistry**

What is the pH of a 1.0E-8 M solution of HCl? Please note that you cannot simply add the contribution of H+ ions from the autoproteolysis of water and the contribution from the dissociation of HCl. You will need to use the quadratic equation to solve this problem and report ...
*September 3, 2010*

**Chemistry**

What is the pH (to three figures) of a 0.1 M solution of sodium acetate given that the acid dissociation constant (Ka) of acetic acid is 1.8E-5? Hint: I keep getting 2.87 but its wrong.
*September 3, 2010*

**Math**

y=3x-3.5
*June 10, 2010*

**Global History**

ok thanks jimmy and Ms.Sue
*April 9, 2010*

**trig**

what is the tan of 25 degrees and 01 minute
*April 7, 2010*

**English**

In many works of literature, an individual's encounter with death or destruction ultimately leads to the individual's affirmation of the dignity and worth of human life. What does this quote means and how does this quote relates to Hamlet by William Shakespeare. I have...
*April 6, 2010*

**s.s.**

it says they slowly decliened
*February 21, 2010*

**s.s.**

history idk
*February 21, 2010*

**s.s.**

Axum's conversion to Christianity a. beneficial b. a drawback c. first a drawback then beneficial d. first beneficial then a drawback
*February 21, 2010*

**algebra**

for x-y=3 add y to both sides then subtract three from both sides. For x+4y=9 subtract x from both sides then divide everything by 4.
*February 1, 2010*

**Can't understand trig problem**

An airplane left an airport and flew east 174 miles. Then it turned northward flying along a bearing of N22E. When it was 254 miles from the airport, there was an engine problem and it turned back to take the shortest route possible back to the airport. Find theta, the angle ...
*February 1, 2010*

**Geography**

What climate does the United States not have?
*January 21, 2010*

**physics**

There's a magic ring in a sealed paint can at the bottom of a frozen pond in the middle of a bog. YOu must get the ring via a plan which: gets you and equipment you need across without sinking, cross the frozen pond without breaking through the ice, lift the paint can out ...
*January 19, 2010*

**algebra 2**

X + 2 = - 2
*January 16, 2010*

**algebra 2**

X+2 = 3 - 5
*January 16, 2010*

**Precalculus **

If sinu = -5/7 and pie<u<3pie/2 find 2u Does anyone know the answer to this (not the steps for solving I know that my answer just keeps coming out funny)
*January 13, 2010*

**Precalculus **

what are the zeroes of the graph 2sin(squared)x + cosx-3 = 0
*January 13, 2010*

**precal desperate**

Given sina= 3/4 and cosB = (-5)/13 and this is Quad II find cos(a+B)
*January 13, 2010*

**precalculus **

Given sina= 3/4 and cosB = (-5)/13 and this is Quad II find cos(a+B)
*January 12, 2010*

**algebra**

Which is greater? 7 3/4 or 7 2/3
*January 6, 2010*

**math**

You got the answer pretty much right but a more exact answer would be 8/3 or 2 2/3. Because in decimal form it is actually 2.66666667
*November 29, 2009*

**Calculus - Related Rates**

12mm^2/hr = r2PI dr/dt So 12/2PIr mm^2/hr = dr/dt which is the same as dr/dt = 6/PIr mm^2/hr Why'd you originally say dr/dt= 12/(2r) mm/hr
*November 29, 2009*

**Calculus - Related Rates**

I'm sorry, I'm not following what you did. I get that we know dx/dt = 12mm^2/hr and we want to find dr/dt but I don't know how you linked them together as a function of r. Maybe show me more steps and how you got the derivative dr/dt. Thanks
*November 29, 2009*

**Calculus - Related Rates**

Bacteria are growing in a circular colony one bacterium thick. The bacteria are growing at a constant rate, thus making the area of the colony increase at a constant rate of 12 mm sq. per hour. Find an equation expressing the rate of change of the radius as a function of the ...
*November 29, 2009*

**science**

how do geologists determine the texture of a rock
*October 15, 2009*

**8th grade**

what is gnama artea it means Kings must follow laws too.
*September 21, 2009*

**com130**

. In what situations might an individual writing process be preferable?
*June 24, 2009*

**calculus**

find the integral of square root of 1+x^3 dx or sqrt(1+ x^3)dx
*February 23, 2009*

**calculus help**

find the integral of square root of 1+x^3 dx or sqrt(1+ x^3)dx
*February 23, 2009*

**calculus i need help please**

evaluate: integration of x^2 (square root of (1-2x^3))dx
*February 19, 2009*

**calculus**

thanks
*February 19, 2009*

**calculus**

evaluate: integration of x^2 (square root of (1-2x^3))dx
*February 19, 2009*

**Government**

How has the clean air act increased the power of the federal government relative to the power of the state governments?
*February 13, 2009*

**Macro Economics**

Can it be considered acceptable to policy makers to have about 7 million people classified as unemployed in the U.S.? Explain.
*September 30, 2008*

**Macro Economics**

I meant frictional unemployment rate
*September 29, 2008*

**Macro Economics**

Does anyone know how to calculate the frictional rate of employment...given the following information... The structural unemployment rate of 2.8%, actual unemployment rate of 7% and cyclical unemployment is 2.0% I just need to know the formula to use??
*September 29, 2008*

**beginning chemistry**

calculate the volume of 750.0g of gold.
*March 11, 2008*

**math grade 3**

need to draw data sets to find the mean. I know how to use this putting the numbers in order from least to greatest, but how do I draw this?
*September 20, 2007*

**Algebra**

Thank you so much! :)
*August 24, 2007*

**Algebra**

I still don't get it! My brain is burnt right now.
*August 24, 2007*

**Algebra**

Gabe lives fifteen miles from school and the bus stops seven times at three minutes each between his house and school. The bus arrives at his house at 7:30. Gabe's friend Aaron lives 8 miles from school and the bus stops four times at 2 minutes each between his house and ...
*August 24, 2007*

**Algebra**

Ann sells apples and Beth sells oranges. Today, half the number of apples than Ann sold was fifteen less than thrice as much the number of oranges that Beth sold. I just want it to know; how do I convert it into an algebraic expression or equation? Is confusing and I don't...
*August 21, 2007*

**Algebra**

so it will be like this? 1/2 A= 3B - 15
*August 20, 2007*

**Algebra**

Thank you. I can work on it now. :)
*August 20, 2007*

**Algebra**

Ann sells apples and Beth sells oranges. Today, half the number of apples than Ann sold was fifteen less than thrice as much the number of oranges that Beth sold. Can someone explain to me what this means and how to do it pretty please? I really need help on this one. Can ...
*August 20, 2007*

**Algebra**

6x²y³ + 9x²y³ 15x²y³ ------------- = ---------- 3x²y² 3x²y² = (15/3) (x²/x²) (y³/y²) = 5y Just want it to know if is correct, but don't y³ + y³ = 2y³? I'm confused now. Can someone ...
*August 15, 2007*

**fractions**

Jacob is making a recipe and requires 3/8 cups of water for stew. He needs to double the recipe . Find your answer in simplest form
*May 23, 2007*

**CHemistry**

Which one of the following is expected to be the strongest Lewis acid? Fe, Fe+, Fe2+, Fe3+ Which do you think would accept electrons the easier? Fe(s) or Fe^+? Do that same kind of logic on the others one by one.
*April 27, 2007*

**Chemistry**

If an equal number of moles of the weak acid HOCN and the strong base KOH are added to water, the resulting solution will be acidic, basic or neutral? There is a complicated answer and a sensible answer. Both arrive at the same answer. But here is the logic for the sensible--I...
*April 27, 2007*

**Algebra HW**

Find the vertex of the function y = –x2 + 2x + 8. it shows me different points as the answer. Im not sure how to find that point. Here are the points: (1,7) or (1,9) or (4,-2) or (-1,-9) Answered in a previous post. Here it is again: Here's a quick way to find the ...
*March 20, 2007*

**Albebra**

Find the vertex of the function y = –x2 + 2x + 8. It is where the derivative -2x + 2 = 0. Since you probably haven't learned about derivatives, do it this way: Rewrite is as -x^2 +2x +8 = -(x-1)^2 + 7 Now look at the form of the formula on the right. It can never be ...
*March 20, 2007*

**Algebra**

Which expression simplifies to –1? A. 7 + w B. x - 2 C. 3 - y ------ ----- ----- w + 7 x + 2 y - 3 D. 4 + z ----- -4 + z A
*March 20, 2007*

**Algebra 1**

how do i graph x + y = 1 put y on one side y=-x+1 im doing an online test and its asking me to find the equation that matches the graph. But im not sure how to figure it out. well the graph should have a negative slope with 1 as y-intercept look for a graph with those tips. it...
*March 20, 2007*

**Social Studies**

What is Nunavut's nickname and motto? Scroll down to the weather section of this site for Nunavut's nickname. (Broken Link Removed) This site has its motto. http://homeschooling.about.com/library/blcanumotto.htm
*February 8, 2007*

**microeconomics**

Question 4. (50 points) In an auction in the market for wholesale electricity, producers of electricity submit bids for each generator that they operate. The bid is the minimum price the operator of the generator is willing to accept for before it will turn it on to supply ...
*September 22, 2006*