Monday

August 31, 2015
Total # Posts: 3,043

**chem- check my answer**

magnesium hydroxide + hydrobromic acid --> is the formula for that Mg(OH)2(s) + HBr(aq) ->H2O(l) +BrOH(s) and are the physical states correct??
*April 9, 2011*

**Math(Please help)**

Nevermind, I actually found the answer. It was easier than I thought.
*April 8, 2011*

**Math(Please help)**

During weeks in a certain flu season, the rate at which the number of cases of influenza per 100,000 people in a country changed could be approximated by I'(t)=3.298e^0.1044t where I is the total number of people per 100,000 who have contracted influenza and t is time ...
*April 8, 2011*

**Economics**

Why does the government try to tackle restrictive practices?
*April 8, 2011*

**Geometry**

The area of a regular octagon is 25. What is the area of a regular octagon with sides five times as large as the sides of the first octagon?
*April 7, 2011*

**Math**

During weeks in a certain flu season, the rate at which the number of cases of influenza per 100,000 people in a country changed could be approximated by I'(t)=3.298e^0.1044t where I is the total number of people per 100,000 who have contracted influenza and t is time ...
*April 7, 2011*

**Economics**

Why is it important for the government to regulate the activities of natural monopolies? Can you name 2 restrictive practices carried out by a company?
*April 7, 2011*

**topics of math**

A population is normally distributed with mean 43.7 and standard deviation 5.2. Find the following probability. (Round your answer to four decimal places.) p( x > 55.0 )
*April 6, 2011*

**Literature**

Ok thank you
*April 3, 2011*

**Literature**

This is my intro with the thesis as the last sentence. We had to use a secondary source so I stated that in the intro as well. In the short story “Where are you going, where have you been?” by Joyce Carol Oates, Connie, one of the main characters, is a fifteen year ...
*April 3, 2011*

**Literature**

I am writing a paper on the movie "Smooth Talk" and the short story "Where are you going where have you been". I am going to be talking about how they are different from each other. I was wondering if someone could just let me know how my thesis sounds, ...
*April 3, 2011*

**CHEMISTRY (URGENT!!!!)**

What is the Keq of NaOBr dissolving in water if the Ka of HOBr dissociating is 6.4*10^-6
*April 3, 2011*

**Math**

Differentiate: f(x) = 2x-(x^2+1)^7 / 3 the answer choices are 1) f'(x) = 2-x / 3(x^2+1)^6 2) f'(x) = 2/3 - 14/3 x(x^2+1)^6 3) None of the above so the answer would number 1 correct?
*April 2, 2011*

**Math**

No they look right I guess they messed up on the answer choices
*April 2, 2011*

**Math**

is it negative 28/3?
*April 2, 2011*

**Math**

Find the slope of the tangent line to the curve y= 4 / 3(x^3 - 2x^2 + 3x -5) at (2, 4/3) the answer choices are 1) 2/3 2) 4/3 3) -28/3 4) -8/3 5) 8/3 My answer was 4/3 but this is wrong.
*April 2, 2011*

**Math(Please check)**

No its just 3
*April 2, 2011*

**Math(Please check)**

Determine whether on not the following limit exists. If, so compute the limit. lim x->3 of sqrtx - 4 / x^3 +27 sqrt 3 - 4 / x^3 + 27 = sqrt 3 -4 / 54 Is this correct?
*April 2, 2011*

**Math**

Well the answer choices are f'(x) = 2-x / 3(x^2 +1)^6 f'(x)= 2/3 - 14/3x(x^2+1)^6 None of the above
*April 2, 2011*

**Math**

Differentiate: f(x) = 2x-(x^2+1)^7 / 3 2-(2x)^6 Would it be 2-x / 3(x^2+1)^6 ?
*April 2, 2011*

**Math**

The answer is 4x^2 + 5 correct?
*April 2, 2011*

**Math**

Well the answer choices were 1) 4x + 5xh + h^2 + 5h 2) 4x + 5h + 4h^2 3) 4x + 5 + 4h^2 + 5h 4) None of the above So the answer is none of the above correct?
*April 2, 2011*

**Math**

if f(x) = 2x^2 + 5x, find f(x+h) - f(x) / h and simplify. I started to do this but then got lost. 2(x+h)^2 + 5x + 2x^2 + 5x all over h 4x^2 + 4xh + h^2 + 5x + 2x^2 + 5x
*April 2, 2011*

**Math**

I need to figure out what the graph of f(x)= 1 / (2-3x)^3 near x=2/3 would look like.
*April 2, 2011*

**Math**

Suppose that x and y are related by the equation x^2/4 + y^3/2 = 4. Use implicit differentiation to determine dy/dx. My answer was 1/3y^2, y cannot = 0 but this is wrong.
*April 2, 2011*

**Math**

I need to figure out what the graph of f(x)= 1 / (2-3x)^3 near x=2/3 would look like.
*April 2, 2011*

**Social Studies**

Both Stalin in the Soviet Union and Hitler in Germany instituted ruthless campaigns against supposed enemies of the state. Why do you think dictators need to find scapegoats for their nations ill? (PLEASE ANSWER THE QUESTION IN ONE BIG PARGRAPH AND THAN I WILL RESTATE IT)
*April 2, 2011*

**Math**

Find the relative minimum point(s) of f(x)=x^4/4 - x^3 -5x^2 - 10 I know you have to take the derivative but I am not sure how to do that for this problem.
*April 2, 2011*

**Math(Please check)**

thank you
*April 2, 2011*

**Math(Please check)**

Find the x coordinates of all relative extreme points of f(x)=1/4x^4 + 2/3x^3- 3/2x^2 + 4 f'(x)=x^3 + 2x^2 - 3x = 0 (x^2 + 3)(x-1) = 0 x=-3 x=1 x=0 Is this correct?
*April 2, 2011*

**Math**

Find the relative minimum point(s) of f(x)=x^4/4 - x^3 -5x^2 - 10 I know you have to take the derivative but I am not sure how to do that for this problem.
*April 2, 2011*

**Math(Please check)**

Find the x coordinates of all relative extreme points of f(x)=1/4x^4 + 2/3x^3- 3/2x^2 + 4 f'(x)=x^3 + 2x^2 - 3x = 0 (x^2 + 3)(x-1) = 0 x=-3 x=1 x=0 Is this correct?
*April 2, 2011*

**Math**

find relative max or min point of 1+x+x/x My answer was 1 but I am not sure this is correct.
*April 2, 2011*

**Math**

ok thank you
*April 2, 2011*

**Math**

the graph of y=10e^2k It is concave up correct? Does it have a minimum at x=o?
*April 2, 2011*

**Math**

Thank you!
*April 2, 2011*

**Math**

Find the slope of e^x at x=0. The slope is 1 correct? e^0=1
*April 2, 2011*

**Math(Please help)**

Thank You so much!!
*April 1, 2011*

**Math(Please help)**

If (e^x)^-2 X (e^x)^2 X e^x = 1/e^2 find x? I have no idea how to do this
*April 1, 2011*

**Math**

If (e^x)^-2 X (e^x)^2 X e^x = 1/e^2 find x? I have no idea how to do this.
*April 1, 2011*

**algebra**

24x^2-22x+3
*April 1, 2011*

**chem**

im studying for a test and i have no idea where to even start for this practice problem..?? a 0.15M(molarity im assuming)solution of BrCl2 contains.. a).15MBr2+ ions and .30M Cl- ions b).30MBr2+ ions and .15M Cl- ions c).15MBr2+ ions and .15M Cl- ions d).30MBr2+ ions and .30M ...
*March 27, 2011*

**French**

I am saying... Put them to bed at 9:00. I don't know wether to use leurs or Les. I have Mets-leur au lit a 9h00. Is it indirect or direct because if it is direct I think I would use Les but idk if it is.
*March 26, 2011*

**How many sig figs?**

For this question: what is the boiling point of 0.39 mol ethylene glycol and 0.13 mol KBr in 155 g H2O? I got 102.1470968 and I tried it with 2 and with 3 sig figs but it's both wrong. I know that's the correct answer but I don't know how many sig figs I'm ...
*March 24, 2011*

**chem**

calculate the freezing and boiling points of each of the following solutions. (a) 0.50 m glucose in ethanol for the freezing point i got 58 but it said i have the wrong sign...?
*March 24, 2011*

**chem**

A 26.8 mL sample of an unknown HClO4 solution requires 46.8 mL of 0.101 M NaOH for complete neutralization. What was the concentration of the unknown HClO4 solution? The neutralization reaction is shown below. HClO4(aq) + NaOH(aq) H2O(l) + NaClO4(aq) i got .00473 M HClO4 but ...
*March 18, 2011*

**Calculus AB**

Please help!!! Given the equations Y=√x, y=3 and x=0 1.) find the volume that is formed by rotating the shaded region about the line y=4 2.) find the volume that is formed by rotating the shaded region about the line x=6 I have a test on this tomorrow and I could ...
*March 16, 2011*

**Writing**

Oh ok thank you so much!!
*March 15, 2011*

**Writing**

I am trying to cite the novella Aura for my works cited page. Fuentes, Carlos. Aura. Bilingual Edition, New York, 1965 Is this correct?
*March 15, 2011*

**Writing**

So far I only have the intro and 2 body paragraphs. I have already proofed and corrected it once but I want to be sure I didn't miss anything. Thank you! The Art of Seduction Through Magic and Religion In the novella Aura written by Carlos Fuentes, the use of magic is ...
*March 15, 2011*

**Writing**

I am writing a paper on the novella Aura by Carlos Fuentes and so far I have a few paragraphs. I was just wondering if I were to post what I have so far would someone be able to proread it for me? I am mostly worried about grammatical errors.
*March 15, 2011*

**calc**

f'(x)=(24)/((2sinx+6cosx)^2) find equation of line y=mx+b
*March 9, 2011*

**Math(Please check)**

Ok thank you!
*March 7, 2011*

**Math(Please check)**

I posted this question a few days ago and someone answered it but I just wanted to make sure that I copied down the correct answers and didn't misunderstand anything. Related Rates: Gas is escaping a spherical balloon at the rate of 2ft^3/min. How fast is the surface area ...
*March 7, 2011*

**Statistics**

A manufacturer has designed a process to produce pipes that are 10 feet long. The distribution of the pipe length, however, is actually Uniform on the interval 10 feet to 10.85 feet. Assume that the lengths of individual pipes produced by the process are independent. Let X and...
*March 5, 2011*

**Science**

A 'heat calorie' is the amount of energy it takes to heat 1 mL of water 1 degree celsius. This is the 'real' calorie. A food calorie is 1000 heat calories. 1 food calorie is written as 1 C. So when you eat something with '150 calories', you're ...
*March 5, 2011*

**math**

cross multiply: (2x+3)*(5x-9) = (3x-6)*(5x+3) double distribution: 10x^2 - 3x -27 = 15x^2 - 21x - 18 combine like terms: 0 = 5x^2 -18x + 9 Then factor it to find two values of x
*March 5, 2011*

**Math(Please help)**

OK thank you!
*March 4, 2011*

**Math(Please help)**

Ok do I actually have to do the calculations though?
*March 4, 2011*

**Math(Please help)**

Is this correct for the last part? (8)(3.14)(12) X (1/(2)(3.14)(12^2) = 4/12
*March 4, 2011*

**Math(Please help)**

Nevermind I meant how did you get 4/r but I figured it out. Thank You!!
*March 4, 2011*

**Math(Please help)**

How did you get 12?
*March 4, 2011*

**Math(Please help)**

Related Rates: Gas is escaping from a spherical balloon at the rate of 2ft^3/min. How fast is the surface area shrinking (ds/dt) when the radius is 12ft? (A sphere of radius r has volume v=4/3 pi r^3 and surface area S=4pi r^2.) Remember that ds/dt = ds/dr X dr/dt Step 1: Find...
*March 4, 2011*

**Chem**

Oh oops I see where u got the 4518.7 but don't u also have to add the middle equation??
*March 3, 2011*

**Chem**

But 334 x 24= 8016
*March 3, 2011*

**Chem**

Q=24.0g (2.03j/gc) (10c) Q=334j/g(24g) Q=24g(4.184j/gc)(45c) Added them and got q= 13022j
*March 3, 2011*

**Chem**

Can u guys check my answer?? Question: convert 24 grams of ice at -10 degrees Celsius to water at 45 degrees Celsius. I got q= 13022 joules Is that correct?
*March 3, 2011*

**Math(Please, please help)**

Nevermind, my question was answered already. Thank you.
*February 27, 2011*

**Math(Please, please help)**

Compute the maximum product for two positive numbers x and y with the property that the sum of the first plus five times the second is 5000. 1) Indicate the objective equation 2) Indicate the constraint equation So the objective = f(x)=xy and the constraint = x+5y=5000 Now ...
*February 27, 2011*

**Math(Urgent)**

did you get 1000-2x/5 as a derivative for x(5000-x)/5?
*February 27, 2011*

**Math(Urgent)**

Thank You
*February 27, 2011*

**Math(Urgent)**

Compute the maximum product for two positive numbers x and y with the property that the sum of the first plus five times the second is 5000. 1) Indicate the objective equation 2) Indicate the constraint equation So the objective = f(x)=xy and the constraint = x+5y=5000 Now ...
*February 27, 2011*

**Math**

Oh I see. I made a mistake with the 28 (x/4). Thanks!
*February 27, 2011*

**Math**

Find the critical values of P(x) p(x)= (28+x)(8-x/4) the answer was p=244-7x+8x-x^2/4 p=-x^2/4 + x + 244 p'= -x/2 +1 = 0 X=2 My question is, I do not understand how they got -7x + 8x at the beginning. I know (28)(8)=244 but I do not get the rest.
*February 27, 2011*

**Math(Urgent)**

For the same question: 3) Rewrite the objective function in terms of the variable x only. I out x=5000-5y 4) For which value of x does the objective function attain its maximum? Do I have to take the derivative?
*February 27, 2011*

**Math(Urgent)**

Compute the maximum product for two positive numbers x and y with the property that the sum of the first plus five times the second is 5000. 1) Indicate the objective equation 2) Indicate the constraint equation I put x+5y=5000. Is this correct.
*February 27, 2011*

**Math(Urgent)**

Thank You
*February 27, 2011*

**Math(Urgent)**

Differentiate. g(x)=(x^3+1)(3x^2-1) I know that the answer is 15x^4-3x^2+6x but I donot know how to get to this. I was using g'(x) X h(x) + g(x) X h'(x) and I was using the derivatives 3x^2 and 6x but I guess this is wrong. Please help!! Thank you.
*February 27, 2011*

**Calculus**

It is supposed to be the first one. Sorry for the confusion!!
*February 26, 2011*

**Calculus**

Find the area in the second quadrant bounded by the x-axis and f(x)=sqrt((x^3/8)+1)
*February 26, 2011*

**Calculus**

An ant moves along the x-axis with velocity given by v(t)=tsin(t^2), t is greater than or equal to zero. Given that x(t) is the position of the particle at time t and that x(0)=3, find x(2) Find the total distance traveled by the particle from t=0 to t=2
*February 26, 2011*

**Math**

Compute the maximum product for two positive numbers x and y with the property that the sum of the first plus five times the second is 5000. 1) Indicate the objective equation 2) Indicate the constraint equation 3) Rewrite the objective equation in terms of the variable x only...
*February 26, 2011*

**Math**

Thank You!!
*February 26, 2011*

**Math**

Actually I figure it out.
*February 26, 2011*

**Math**

Differentiate g(x)=(x^3+1)(3x^2-1) so I use g'(x) X h(x) + g(x) X h'(x) so the derivative of (x^3+1)=3x^2 and (3x^3-1)=6x So (3x^2)(x^3+1) + (x^3+1)(6x) Is this correct so far. If so this is where I am stuck. I am having trouble simplifing.
*February 26, 2011*

**Math**

Which of the following could represent a function having the given properties? 1)increasing slope for x<4 2) f'(x)>0 for all x(x cannot =4) 3)asymptote at x=4. Again I know we cannot graph but how can I figure this out?
*February 26, 2011*

**Math**

which of the following graphs could represent a function with the following 3 properties? 1) f(x)>0, for x<0 2) f'(x) is less than or equal to 0, for all x 3) f'(0)=0 I know that we cannot draw the graph but to figure this out I f(x)>0 would mean that the ...
*February 26, 2011*

**Math**

oh ok so its -400. Thanks I see now
*February 26, 2011*

**Math**

but I still do not see how you got 300. -20(2)=400 + 40(20)=800 - 100 = 1100?
*February 26, 2011*

**Math**

oh ok I did I got x=-20 instead of 20. Thank you!!
*February 26, 2011*

**Math**

A manufacturer estimates that the profit P from producing x units of a commodity is P=-x^2+40x-100 dollars per week. What is the maximium profit he can realize in one week? I was going to take the derivative of the equation and set it equal to 0 and then plug it back in but it...
*February 26, 2011*

**Chemistry**

While in Europe, if you drive 113 km per day, how much money would you spend on gas in one week if gas costs 1.10 euros per liter and your car's gas mileage is 32.0 mi/gal? Assume that 1 euro = 1.26dollars.
*February 25, 2011*

**Chemistry**

which substance has the greatest intermolecular forces of attraction between molecules ? 1)propanone 2)ethanol 3)water 4)ethanoic acid dont really understand, please help
*February 24, 2011*

**Chemistry**

choice 3 ?
*February 24, 2011*

**Chemistry**

the vapor pressure of ethanol at its normal boiling point would be 1)80 kPa 2)101.2 kPa 3)273 kPa 4)373 kPa would it be 1 ?
*February 24, 2011*

**Chemistry**

2NaHCO3(s)+ heat -->Na2CO3(s)+ H2O(g)+CO2(g) is this right ? Determine how many moles of CO2(g) is produced when 7mols of NaHCO3 are consumed. question i asked earlier, i got 3.5 moles am i right ?
*February 24, 2011*

**Chemistry**

would the answer be 14 moles of CO2?
*February 24, 2011*

**Chemistry**

Balance this equation. NaHCO3(s) + heat ----> Na2CO3(s) + H2O(l) + CO2(g). i balanced it & got: 2NaHCO3(s)+ heat -->Na2CO3(s)+ H2O(g)+CO2(g) is this right ? Determine how many moles of CO2(g) is produced when 7mols of NaHCO3 are consumed. how do i do this ?
*February 24, 2011*

**Chemistry**

i got 29 %
*February 24, 2011*

**Chemistry**

. What is the percent by mass of nitrogen in (NH4)2CO3? dont know how to do, please help.
*February 24, 2011*