Thursday

April 24, 2014

April 24, 2014

Total # Posts: 2,806

**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?

**Math**

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

**Math**

ok thank you

**Math**

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

**Math**

Thank you!

**Math**

Find the slope of e^x at x=0. The slope is 1 correct? e^0=1

**Math(Please help)**

Thank You so much!!

**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

**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.

**algebra**

24x^2-22x+3

**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 ...

**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.

**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 supp...

**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...?

**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 i...

**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 serious...

**Writing**

Oh ok thank you so much!!

**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?

**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 freq...

**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.

**calc**

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

**Math(Please check)**

Ok thank you!

**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 ...

**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...

**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 actua...

**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

**Math(Please help)**

OK thank you!

**Math(Please help)**

Ok do I actually have to do the calculations though?

**Math(Please help)**

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

**Math(Please help)**

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

**Math(Please help)**

How did you get 12?

**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...

**Chem**

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

**Chem**

But 334 x 24= 8016

**Chem**

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

**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?

**Math(Please, please help)**

Nevermind, my question was answered already. Thank you.

**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 num...

**Math(Urgent)**

did you get 1000-2x/5 as a derivative for x(5000-x)/5?

**Math(Urgent)**

Thank You

**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 num...

**Math**

Oh I see. I made a mistake with the 28 (x/4). Thanks!

**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.

**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?

**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.

**Math(Urgent)**

Thank You

**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.

**Calculus**

It is supposed to be the first one. Sorry for the confusion!!

**Calculus**

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

**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

**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...

**Math**

Thank You!!

**Math**

Actually I figure it out.

**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.

**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?

**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 grap...

**Math**

oh ok so its -400. Thanks I see now

**Math**

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

**Math**

oh ok I did I got x=-20 instead of 20. Thank you!!

**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...

**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.

**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

**Chemistry**

choice 3 ?

**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 ?

**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 ?

**Chemistry**

would the answer be 14 moles of CO2?

**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 ?

**Chemistry**

i got 29 %

**Chemistry**

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

**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?

**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?

**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 Aur...

**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

**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 ?

**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

**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 i...

**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.

**chem**

q =4.9 k/J

**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...

**Math**

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

**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.

**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?

**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

**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

**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

**Economics**

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

**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 incent...

**Economics**

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

**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

**chem**

nvm i got it

**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 equa...

**Chemistry**

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

**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?

**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?

**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?

**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...

**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 magn...

**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 leave...

**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 h...

**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...

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