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October 1, 2014

Posts by Hannah


Total # Posts: 2,871

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 dont 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

Math(Please check)
Find the slope of the graph at y=sqrt 2x^2 +1 at the point (2,3). First I plugged 2 into the equation and got 3. Then the derivative of the equation is 4x and then I multiplied that by 3 and got 12. Is this correct?
February 5, 2011

Math
Find the derivative of f(x)= 2 sqrt x at x=4. i thought that the derivative would be 2 x^1/2 but I guess this is wrong.
February 5, 2011

Math
Calculate the limit limit x->infinity 2x^2 + 100 / x^2 +1 I am not sure how to do this.
February 1, 2011

Math
Find the slope of the curve at y=x^6 at x=-3. I know that to find the slope you do y2 - y1 / x2 - x1 but I do not know what to do here.
January 30, 2011

Math(Please check)
So if though it says that the rate at which the epidemic is spreading is 110 per day that is not rate of change correct?
January 30, 2011

Math(Please check)
During the month of February, a flu epidemic hit the University. The number of people sick at time t (measured in days) is given by the function P(t). The rate at which the epidemic is spreading on February 3 is 110 people per day. How is the information best represented ...
January 30, 2011

Math(Please check)
I had the negative sign there because thatg was one of the answer choices that best fit what I had but there is no negative correct? Its positive?
January 30, 2011

Math(Please check)
Find the derivative of f(x)=1/3 sqrt x. The 3 is little above the square root. I know that it is -1/3x^-4/3. Can this be written as -1/3x^4/3 ?
January 30, 2011

Math(Please check)
Another answer choice was y=-2076x + 15,780. Is this correct? If it is I do not understand how they go -2076. Thank you for your help!
January 30, 2011

Math(Please check)
The value of an automobile was $15,780 in 1994 and depreciated to $5400 in 1999. Let y be the value of the automobile in the year x, where x = 0 represents 1994. Write a linear equation in slope-intercept form that models the value y of the automobile, x years after 1994. ...
January 30, 2011

Math(Please check)
Thank You
January 30, 2011

Math(Please check)
Find the derivative of f(x)=7x-19 at x=2. I think that the derivative would be 7 and theb times 2 so 14. Is this correct or would it just be 7.
January 30, 2011

chem
I know carbon is tetrahedral but i dont know oxygen
January 29, 2011

chem
I dont get how to the structure and how to find oxygen separetley
January 29, 2011

chem
Determine the electron and molecular geometries of each of the following molecules. For those with more than one central atom, indicate the geometry about each central atom. (Enter your answers in the order given in the skeletal structure from left to right.) CH3OH (skeletal ...
January 29, 2011

What do taxes pay for
RACEMIDE
January 28, 2011

Help
Thanks, it didn't look right thats why I reposted
January 27, 2011

Help
I get x=3 can you let me know if I have it right
January 27, 2011

Help
Is there a website that will help me solve this? I can't find anything. I'm coming up with x=1/3 but I feel I'm doing it wrong. Find all real number solutions to (cubed root 3x-8)-1=0 If there is more than one solution, separate them with commas. If there is no ...
January 27, 2011

Math
Is is x=1/3
January 27, 2011

Math
Find all real number solutions to (cubed root 3x-8)-1=0 If there is more than one solution, separate them with commas. If there is no solution, answer as "No solution."
January 27, 2011

Health
thanks, do you have any other suggestions?
January 27, 2011

Health
I need an example of a health fraud item/ product. I need to find one product that has health fraud and that I can write 150 words about. I tried searching on google but cant find anything/ dont know what to search. do you know of any products? thanks
January 27, 2011

History
Describe an advantage of havinf federal judges appointed rather then elected
January 26, 2011

History
Why is it important to learn about the government?
January 26, 2011

History
What problems might arise from making the runner-up in the presidential election the vice president?
January 25, 2011

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