Sunday

February 19, 2017
Total # Posts: 3,313

**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*

**Interpretation of fiction**

Yes I am but I already stated his name in my introduction. Are you saying I should add his name in my thesis?

*February 24, 2011*

**Interpretation of fiction**

The novella Aura. My thesis statement for my paper is: The use of magic in this story serves for the purpose of seducing Felipe. Does this statement sound ok?

*February 24, 2011*

**Interpretation of fiction**

I was wondering if anyone has read the novela "Aura" by Carlos Fuentes. If so I am writing a paper about what the purpose was for the use of magic in the story. I think that magic was used in order to seduce the main character Felipe. I think that the creation of ...

*February 24, 2011*

**Chemistry**

in a closed system at 40 C, a liquid has a vapor pressure of 50 KPa. the liquid's normal boiling point could be (1)10 C (2)30 C (3)40 C (4)60 C

*February 23, 2011*

**Chem**

as the pressure on a liquid is changed from 100.kPa to 120.kPa, the temperature at which the liquid will boil decease increase or remain the same ?

*February 23, 2011*

**Math**

Find the following function y=[(x-5)(4x+3)]^5 I arrived at 5(6x-2)[(x-5)(4x+3)]^4 The answer is 5(8x-17)[(x-5)(4x+3)]^4 but I am not sure how they got the 8x-17

*February 23, 2011*

**Religious Studies**

Just need sme help with these questions: 1. Timothy 3:16 says that all scripture is inspired by God, what exactly does this mean? 2. If yu were a liberal Christian how would you interpret the creation story in Genesis 1-3? 3. If you were a fundamental Christian how would you ...

*February 23, 2011*

**math**

use the quotient rule to find derivative. y= 3x^2+8 / x^2+3 (x^2+3)(6x) - (3x^2+8)(2x) all over (x^2+3)^2 The answer is 2x/(x^2+3)^2 The only problem is I am not sure how they simplified this to get the answer.

*February 22, 2011*

**chem**

q =4.9 k/J

*February 22, 2011*

**Maths**

a curve ahs parametric equations x=t^2 and y= 1-1/2t for t>0. i)find the co-ordinates of the point P where the curve cuts the x-axis which i found to be P(1/4, 0) the next part i cant do ii) find the gradient of the curve at this point. So far, I have the gradient to be: -2...

*February 22, 2011*

**Math**

What is a reasonable estimate of the perimeter of the base that is a square with all 4 sides 143.5 meters,

*February 21, 2011*

**Religious Studies and Ethics**

I am trying to write a little paragragh on RS, the subject and I need to write about the many siginificant discoveries that have been really helpfyul in the past 100 years or in recent years. I just need some ideas.

*February 18, 2011*

**Physics**

If one firework produces a sound intensity of 90 dB, what would be the intensity of a sound produced by 1000 firecrackers all going off at once?

*February 17, 2011*

**chem-repost**

How many grams of magnesium oxide are formed when 13.5 L of oxygen gas, measured at STP, completely reacts with magnesium metal according to the following reaction? i got .496 g but i know that like way off

*February 17, 2011*

**9th grade polynomials**

area= lX w so by substituting the numbers and variables for the lenght and using x for the width we get area= (2+3x) X x

*February 17, 2011*

**chem**

How many grams of magnesium oxide are formed when 13.5 L of oxygen gas, measured at STP, completely reacts with magnesium metal according to the following reaction? i got .496 g but i know that like way off

*February 17, 2011*

**Economics**

so how is that trying to reduce the poverty trap and how is not?

*February 16, 2011*

**Economics**

Ok sorry about that. So far I have that is the minimum wage is increased then those who get benefits will nnot receive them anymore as they are having higher incomes. I also said that increasing the minimum wage will reduce the poverty trap because it gives employees an ...

*February 16, 2011*

**Economics**

Discuss whether the minimum wage will reduce the poverty trap? I need 3 ways for and 3 ways against

*February 16, 2011*

**chem**

A balloon holds 29.3 kg of helium. What is the volume of the balloon if the final pressure is 1.2 atm and the temperature is 22°C? using the equation pv=nrt would i put 29.3 kg in place of n? but n has to be in moles so how do you convert that? thanks

*February 14, 2011*

**chem**

nvm i got it

*February 14, 2011*

**chem**

An experiment shows that a 114 mL gas sample has a mass of 0.167 g at a pressure of 721 mm Hg and a temperature of 32°C. What is the molar mass of the gas? so im suppose to find the molar mass but i thought that was the same as the g just converting it..? im using the ...

*February 14, 2011*

**Chemistry**

How many grams of potassium carbonate are needed to make 0.200 L of a 2.50M solution?

*February 13, 2011*

**Math**

The cost of Mrs.Taylors purchases was $45.87 She had a coupon for 20% off the total. Find, to the nearest cent, the amount of money she will save if she uses the coupon?

*February 10, 2011*

**Math**

The cost of Mrs.Taylors purchases was $45.87 She had a coupon for 20% off the total. Find, to the nearest cent, the amount of money she will save if she uses the coupon?

*February 10, 2011*

**physics for dummies!**

The man hanging upside down is holding a partner who weighs 699 N. Assume that the partner moves on a circle that has a radius of 3.37 m. At a swinging speed of 3.49 m/s, what force must the man apply to his partner in the straight-down position?

*February 10, 2011*

**physics cars!**

Car A uses tires for which the coefficient of static friction is 0.175 on a particular unbanked curve. The maximum speed at which the car can negotiate this curve is 28.3 m/s. Car B uses tires for which the coefficient of static friction is 0.740 on the same curve. The cars of...

*February 10, 2011*

**physics help go!**

Two cars are traveling at the same speed of 27 m/s on a curve that has a radius of 126 m. Car A has a mass of 1020 kg, and car B has a mass of 1670 kg. Find (a) the magnitude of the centripetal acceleration and (b) the magnitude of the centripetal force for Car A, (c) the ...

*February 10, 2011*

**Ch. 5 physics help!**

There is a clever kitchen gadget for drying lettuce leaves after you wash them. It consists of a cylindrical container mounted so that it can be rotated about its axis by turning a hand crank. The outer wall of the cylinder is perforated with small holes. You put the wet ...

*February 10, 2011*

**physics please help! 116**

Two blocks are connected by a rope that passes over a set of pulleys. One block has a weight of 412 N, and the other has a weight of 908 N. The rope and the pulleys are massless and there is no friction. (a) What is the acceleration of the lighter block? (b) Suppose that the ...

*February 10, 2011*

**physics help please!**

A spacecraft is on a journey to the moon. At what point, as measured from the center of the earth, does the gravitational force exerted on the spacecraft by the earth balance that exerted by the moon? This point lies on a line between the centers of the earth and the moon. The...

*February 10, 2011*

**physics 2 help please!**

The space probe Deep Space 1 was launched on October 24, 1998. Its mass was 474 kg. The goal of the mission was to test a new kind of engine called an ion propulsion drive. This engine generates only a weak thrust, but it can do so over long periods of time with the ...

*February 10, 2011*

**physics 1 please help!**

A man seeking to set a world record wants to tow a 106000-kg airplane along a runway by pulling horizontally on a cable attached to the airplane. The mass of the man is 77 kg, and the coefficient of static friction between his shoes and the runway is 0.99. What is the greatest...

*February 10, 2011*

**physics 1 please help!**

A man seeking to set a world record wants to tow a 106000-kg airplane along a runway by pulling horizontally on a cable attached to the airplane. The mass of the man is 77 kg, and the coefficient of static friction between his shoes and the runway is 0.99. What is the greatest...

*February 10, 2011*

**Algebra**

A roadside vegetable stand sells pumpkins for $5 each and squash for $3 each. One day they sold six more squash then pumpkins and their sales totaled $98.00. Write a system of equations to find the number of pumpkins and squash they sold.

*February 10, 2011*

**chem**

i need help on this question: Equal masses of gaseous N2 and Ar are placed in separate flasks of equal volume at the same temperature. Tell whether each of the following statements is true or false. a) There are more molecules of N2 are present than atoms of Ar. true or false...

*February 10, 2011*

**World Geography**

What are three ways geography influenced Roman History?

*February 9, 2011*

**math**

if csc theta= -5/3 and theta has its terminal side in quadrant III, find the exact value of tan 2 theta.

*February 8, 2011*

**English**

for "Children of the River" I have to come up with a thesis statement for chapter 1 I don't know what it is.....please help

*February 7, 2011*

**Algebra 1**

What property justifies that 3y+9 = 9+3y

*February 7, 2011*

**Math(Please check)**

What is the difference between the actual increase in profit as production increases from 5 to 6 units, and the marginal profit at a production level of 5 units where the profit function is given by p(x)= 3x^2 - 5x + 2 First I plugged 5 into the equation and got 52. Then I ...

*February 5, 2011*