Sunday
November 23, 2014

Posts by erica


Total # Posts: 535

Chemistry
a sample of gas has the pressure of 1120 mmhg and volume of 2.00 L. if the pressure is changed to 0.155 atm calculate the new volume
November 29, 2011

Calc
Describe in words the set of all points in R³ that satisfy the following expressions: a) z=0 b) z≥0 c) y≤0
November 7, 2011

s.s
I just took this exam and the answer is, in fact, cotton yarn.
November 2, 2011

Calc
Solve: du/dt = (sin t) / (u^2 + 1) So far I got: arctan u = -ln |csc t + cot t| + C I'm not sure where to go from there. Thank you so much for the help!
October 31, 2011

Calc
How do you take the integral of dy/(y^2 + 4)?
October 30, 2011

Calculus
What is the limit as t→∞ of L(t)? L(t) = 34 - 32e^(-0.0719t) Thank you so much!
October 30, 2011

Calculus
Suppose that you follow the size of a population over time. When you plot the size of the population versus time on a semilog plot (i.e., the horizontal axis, representing time, is on a linear scale, whereas the vertical axis, representing the size of the population, is on a ...
October 30, 2011

Calc
Find the integral from -∞ to -1 of 1/(1+x²) dx. I started working the problem out, and so far I got the lim as z→-∞ of [arctan (-1) - arctan (z)]. I'm a little bit confused exactly what is means when you plug -∞ into z, and how to solve the ...
October 24, 2011

Calculus
How do you solve the integral from 0 to 1 of x arctan x dx?
October 24, 2011

Calculus
How do you integrate 3∫(1)/(x²+1)² dx ? Thank you!
October 19, 2011

Calc
Use substitution to evaluate the indefinite integral: The integral of [ (sq. root (1 + ln x)) ((ln x)/x) dx] Im confused on what i should substitute u and du for. Thank you so much!!
October 19, 2011

Calculus
Evaluate the indefinite integral: ∫ from 1 to 2 of ln (x²e^x) dx Thank you for your help!!
October 18, 2011

Calculus
Use either substitution or integration by parts to evaluate the integral: ∫(x+2)/(x²+2) dx Thank you!!
October 18, 2011

Calc
First make an appropriate substitution and then use integration by parts to evaluate the indefinite integrals: ∫ sinx cos³x e^(1-sin²x) dx I was going to substitute u= 1 - sin²x, but then i got du = ½ sinxcosx - ½ xdx, so im stuck. Thank you ...
October 18, 2011

Calc
Use integration by parts to evaluate the integral. ∫ from 1 to 4 of (√x) (ln√x) dx Im not really sure what to choose for u and dv. Thank you so much for the help!!
October 18, 2011

Calculus
F(x) = cos(x) • the integral from 2 to x² + 1 of e^(u² +5)du Find F'(x). When i did this, i got: -2xsin(x)e^((x²+1)² + 5) But my teacher got: -sin(x) • the integral from x² + 1 of e^(u² +5)du + 2xcos(x)e^((x²+1)² + 5) Do ...
October 17, 2011

physics
To plot the potential energy, simply plug your givens into the equation U=(1/2)kx^2. You should get a parabola that goes to 0 in the center. To determine the turning points of the block, use the law of conservation of energy. You know that Ui+Ki = Uf+Kf since there is no ...
October 16, 2011

Statistics
The production process of computer parts uses two machines one old & one new. If the old machine is used the probability that the defected part is produced is .13 if the new machine is used the probability that the defective part is produced is .04. moreover, the new machine ...
October 12, 2011

Physics
F=kx F (tension of the strand)=1.2 pN x (displacement)=26 µm Solve for k, which is the spring constant. You may need to convert your unit measurements, as your answer's unit will come out in pN/µm instead of the standard N/m. (I know this is a little late, but ...
October 12, 2011

Calculus
A particle moves along the x-axis with velocity v(t) = -(t-3)² + 5 for [0,6]. a) Find the average velocity of this particle during the interval [0,6]. b) Find a time t* ∈ [0,6] such that the velocity at time t* is equal to the average velocity during the interval [0...
October 10, 2011

Calc
Recall that the acceleration a(t) of a particle moving along a straight line is the instantaneous rate of change of the velocity v(t); that is, a(t) = d/dt v(t) Assume that a(t) = 32 ft/s². Express the cumulative change in velocity during the interval [0, t] as a definite...
October 10, 2011

Calc
Find the areas of the regions bounded by the lines and curves by expressing x as a function of y and integrating with respect to y. x = (y-1)² - 1, x = (y-1)² + 1 from y=0 to y=2. I graphed the two functions and the do not intersect? Does it matter? Or do I still ...
October 10, 2011

Chem
Calculate the amount (in moles) of H₂O in 2.00g of Na₂CO₃ ⋅ 10H₂O. Thanks so much!!
October 8, 2011

Chem
The field of nanotechnology offers some intriguing possibilities, such as the creation of fibers one atom wide. Suppose you were able to string together 1.00 mol Ag atoms, each of radius 144 pm, into one of these fibers by encapsulating them in carbon nanotubes. How long would...
October 8, 2011

Chem
Calculate the amount (in moles) of Cu²+ ions in 3.00g of CuBr₂. Thank you so much for the help!!
October 8, 2011

Chem
Epsom salts consist of magnesium sulfate heptahydrate. Write its formula. a) How many atoms of oxygen are in 5.15g of Epsom salts? b) How many formula units of the compound are present in 5.15g? c) How many moles of water molecules are in 5.15 g of Epsom salts? Thank you so ...
October 7, 2011

physics
if a car can accelerate at 6m/s2, how fast can it accelerate if it is towin an identical car behind it?
October 5, 2011

Calculus
Assume that a>0. Evaluate the integral from 0 to a of x dx by approximating the region bounded by y=x and the x-axis from 0 to a with rectangles. Use equal subintervals and take right endpoints.
October 2, 2011

Math
^^^kids
September 21, 2011

business
Amyris Biotechnologies was building a plant in 2009 and had synthetic technology to change sugarcane to fuels and chemicals that can be renewed. Their marketing firm was looking for a chemical and a fuel that could be recycled for future use. In 2011, it was decided that the ...
September 21, 2011

Speech
Oh okay I see now. It's just seemed kind of confusing because I have never had a speech class before.
September 21, 2011

Speech
Scrapbooking can be fun and release stress and it can be a good memory for yourself and for your loved ones especially if you have kids. You can also make birthday cards and invitations. More than anything scrapbooking can help you be creative. Does that make sense :/?
September 21, 2011

Speech
My speech can be about anything so I'm going to write and talk about scrapbooking because that is something I enjoy doing.
September 21, 2011

Speech
Hi I have a speech to present and my professor gave me the outline on how to prepare it but I'm having a hard time setting it up. Is their any kind of way you can help me. Thank you, Erica
September 21, 2011

Acct
Journalize the following transactions -Recieved cash from investment made by owner,$15000. Recieved cach providing accounting services, $8000. Billed customers on account for providing services, $4000. Paid Advertising expense 400. Recieved cash from customers on account 3500.
September 20, 2011

College English
I need to write a 700 word essay on what my name means. Can I please get some help!!!
September 19, 2011

English
It needs to be with my first name which is "Erica". Sorry I am new to this website and I did not see your question.
September 19, 2011

English
I have to write a 700 word essay on what my name means ????????????? And I need help!!!!
September 19, 2011

Science
What is the pressure at the bottom of a tube of mercury that is 0.2 m deep? An elephant with a mass of 1000 kg stands on a circus platform that weighs 50 kg. The area of the bottom of the platform is 1.25 m². How much pressure is exerted on the floor beneath the platform...
September 15, 2011

SCIENCE
When the following are placed in water, for which of them will the buoyant force be more than as its weight? A) an ice cube B) a piece of frozen glycerin C) a gold ring D) a piece of aluminum foil 2. Sometimes when I get in my swimming pool I take a plastic cup filled with ...
September 15, 2011

SCIENCE
When the following are placed in water, for which of them will the buoyant force be more than as its weight? A) an ice cube B) a piece of frozen glycerin C) a gold ring D) a piece of aluminum foil 2. Sometimes when I get in my swimming pool I take a plastic cup filled with ...
September 15, 2011

Science
thanks so much
September 11, 2011

Science
A satellite orbiting at an elevation of 3200 km does what a) Stays beyond the earth's gravity, which is why it stays up there. B) in an elliptical orbit, since its speed is less than the escape velocity. C) Falling toward earth with an acceleration equal to g. D) Falling ...
September 11, 2011

Algebra
5(2n + 4) - 3(4n - 6) = 2(20 - n) I solved this equation and this is what I got. 10n + 20 - 12n + 18 = 40 - 2n -2n + 38 = 40 -2n 38 ≠ 40 What does this mean? Thank you!
August 31, 2011

Chemistry
A mixture of gases at 760.0 torr contains 35.0% nitrogen, 22.0% oxygen , and 43.0% carbon dioxide by volume. What is the pressure of the carbon dioxide gas in torr?
August 19, 2011

Greek
The Greek base HELI- means?
July 19, 2011

anatomy and physiology 1
which membrance surround and protect the vital organs in the chest cavity?
July 15, 2011

anatomy and physiology 1
give examples of the various tissue types that exist in your arm. please help me test monday.
July 15, 2011

anatomy and physiology 1
describle two vision disorders that cause abnormal eyeballshape.
July 15, 2011

algebra II
Simplify: a^4-b^4/a-b
July 3, 2011

algebra II
Simplify: (3c^2)(-6cd)^-2
July 3, 2011

physics
Find the final velocity of the two balls if the ball with velocity v2i = -19.5 cm/s has a mass equal to half that of the ball with initial velocity v1i = +26.8 cm/s. PLEASE HELP!! i have tried so many different ways and can't seem to get the answer
June 2, 2011

physics
Find the final velocity of the two balls if the ball with velocity v2i = -19.5 cm/s has a mass equal to half that of the ball with initial velocity v1i = +26.8 cm/s.
June 2, 2011

calculus
3. A deposit of ___(i)___is made into an account paying an interest rate of 5% compounded annually. How many annual payments of ___(iii)___can be made from this account? a) (i)$100,000 (ii)$10,000 b) (i)$200,000 (ii)$20,000 c) (i) 10x (ii) x d) (i) 10x (ii) x at r% compounded ...
June 1, 2011

global history
the wealth that enabled the Italian city-states to lead in the development of Renaissance arts was derived mainly from? a)the quantities of gold and silver brought back to Italian explorers b)concentration of riches in the hands of the king and his court c)their participation ...
May 31, 2011

physical science
you are standing on a street corner, and you hear a fire truck approaching. does the pitch of the siren stay constant, increase, or decrease as it approaches you? does the pitch of the siren stay constant, increase, or decrease as it moves away?
May 23, 2011

stats
A company with a large fleet of cars found that the emissions systems of 18 out of the 65 randomly selected cars they tested failed to meet pollution control guidelines. Is this strong evidence that more than 20% of the fleet might be out of compliance? Test the appropriate ...
May 11, 2011

Calc
To what limit does the sequence Sn = (3+n) /3^n converge as n approaches infinity?
May 3, 2011

Calc
How do you know what shape the graph in the xy-plane represented by x=3sin(t) and y=2cos(t) is?
May 3, 2011

calc
The rate that an object cools is directly proportional to the difference between its temperature ( in Kelvins) at that time and the surrounding temperature (in Kelvins). If an object is initially at 35K, and the surrounding temperature remains constant at 10K, it takes 5 ...
April 25, 2011

Calc
A particle moves along a path described by x=cos³t and y=sin³t. The distance that the particle travels along the path from t=0 to t=π/2 is... Thank you!
April 25, 2011

calc
If f(x)= (3x)^(3x), then f'(x) = ? Thank you!
April 25, 2011

Calc
What is the volume of the solid generated by rotating about the y-axis the region enclosed by y=sinx and the x-axis, from x=0 to x=π? Thank you for your help!!
April 25, 2011

calc
If a particle moves in the xy-plane so that at time t>0 its position vector is (e^(t²), e^(-t³)), then its velocity vector at time t=3 is...? Thanks so much!
April 25, 2011

Calc
Find the integral from 1 to 0 of arcsin(x)dx Thank you!
April 25, 2011

Calc
Use differentials to approximate the change in the volume of a cube when the side is decreased from 8 to 7.99 cm. (in cm^3) Thank you so much!!
April 25, 2011

Calc
Use differentials to approximate the change in the volume of a cube when the side is decreased from 8 to 7.99 cm. (in cm^3) Thank you so much!!
April 25, 2011

Calc
What is the limit as x approaches infinity of 4xsin(1/x)? Can you also show me how you get the answer? Thank you so much!!
April 25, 2011

goverment
For the first eleven years of its existence, the United States was a _____.
April 12, 2011

macroeconomics
a description of a specific macroeconomic phenomenon or event and how it has impacted you
March 30, 2011

hcs 341
How can an organization forecast future staffing needs in order to maintain consistent staffing levels?
March 18, 2011

social studies
Christopher Columbus' treatment of Native Americans can BEST be described as friendly, peaceful but not friendly, violent& hostile,or fair?
March 11, 2011

Chemistry
What is the percentage of potassium chloride to oxygen?
March 7, 2011

Chemistry
What is the percentage of potassium chloride to oxygen?
March 7, 2011

Calc
I have to find the integral of 1/(sq. rt. of (4x-x²)) dx. I know I have to complete the square of the denominator, but im confused on how that process works when im only given 4x-x². Could you demonstrate how to complete the square for that equation? Thank you so much!
February 22, 2011

Calc
The line y = mx+b with b≥2 is tangent to the graph f(x) = -2(x-2)² + 2 at a point in the first quadrant. What are all possible values of b?
February 22, 2011

Calc
If dy/dt = 2y/(t(t+2)) for t>0 and y = 1 when t = 1, then when t = 2, y = ?
February 22, 2011

Calc
A rectangle is to be inscribed in a semicircle of radius 8, with one side lying on the diameter of the circle. What is the maximum possible area of the rectangle?
February 22, 2011

calc
If dy/dx = xy - y^2 and y(1) = 3, then y (2) = ?
February 22, 2011

Calc
If n is a positive integer, find the limit as n approaches +∞ of 1/n(sin (π/n) + sin (2π)/n + ... + sin (nπ)/n)
February 21, 2011

Calc
Let f(x) = x^3 - 7x^2 + 25x - 39 and let g be the inverse function of f. What is the value of g'(0)?
February 21, 2011

Calc
If the substitution u=x^2 + 1 is made, then the integral from 0 to 2 of [(x^3)/(x^2 + 1)]dx = ? Thank you for your help!
February 21, 2011

chemistry
at 327 degrees C, the equilibrium concentrations are [CH3OH]=0.15M, [CO]=0.24M, and [H2]=1.1M for the reaction: CH3OH(g)<-->CO(g)+2H2(g) Calculate Kp at this temperature
February 16, 2011

Calc
Find the indefinite integral. Integral of [1/(4+3x²)]dx Thank you so much for your help!
February 16, 2011

Calc
Find the indefinite integral. Integral of (2x)/(x-4)dx Thank you so much!
February 16, 2011

Calc
Find the indefinite integral. Integral of (x+1)/(√(x²+2x-4))dx Thank you for your help!
February 16, 2011

Calc
What is the antiderivative of dy/dx = x/(x^2 + 1)?
February 15, 2011

Calc
The base of a solid is a circle of radius a, and its vertical cross sections are equilateral triangles. The volume of the solid is 10 cubic meters. Find the radius of the circle.
February 10, 2011

human resource management
Which of the following would not be an informative or positive message? a. Summary b. Claim adjustment C. Transmittal d. Direct request
February 8, 2011

HUMAN RESOURCE MANAGEMENT
When writing informative and positive messages, you should include reader benefits when:
February 8, 2011

human resource management
Informative and positive messages are not necessarily short: Instead , the length of a message depends on all the following EXCEPT:
February 8, 2011

math
Look at a multiplication table.
February 7, 2011

problem solving
Try to first multiply it. You should get your answer correct that way. :-)
February 7, 2011

Writing
what is your guess?
February 7, 2011

REPORT CARD QUESTION
cooll!
February 7, 2011

Measurments
What don't you understand the inches or the millimeters?
February 7, 2011

Math
go to google and type in ixl then click on the website. click on first grade. try this site, and let me know if this helps. :-)
February 7, 2011

Math
What grade is he in?
February 7, 2011

Math
Okay is it 1 or i?
February 7, 2011

Math
Your question is not a question. What are you asking help for? 52 and what number?
February 7, 2011

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