Thursday

July 24, 2014

July 24, 2014

Total # Posts: 532

**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 l...

**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 pro...

**Calculus**

How do you solve the integral from 0 to 1 of x arctan x dx?

**Calculus**

How do you integrate 3∫(1)/(x²+1)² dx ? Thank you!

**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!!

**Calculus**

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

**Calculus**

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

**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 ...

**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!!

**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 yo...

**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 frict...

**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 p...

**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 ...

**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...

**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...

**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 fin...

**Chem**

Calculate the amount (in moles) of H₂O in 2.00g of Na₂CO₃ ⋅ 10H₂O. Thanks so much!!

**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...

**Chem**

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

**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 mu...

**physics**

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

**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.

**Math**

^^^kids

**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 f...

**Speech**

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

**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 :/?

**Speech**

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

**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

**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.

**College English**

I need to write a 700 word essay on what my name means. Can I please get some help!!!

**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.

**English**

I have to write a 700 word essay on what my name means ????????????? And I need help!!!!

**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?...

**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 win...

**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 win...

**Science**

thanks so much

**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 t...

**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!

**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?

**Greek**

The Greek base HELI- means?

**anatomy and physiology 1**

which membrance surround and protect the vital organs in the chest cavity?

**anatomy and physiology 1**

give examples of the various tissue types that exist in your arm. please help me test monday.

**anatomy and physiology 1**

describle two vision disorders that cause abnormal eyeballshape.

**algebra II**

Simplify: a^4-b^4/a-b

**algebra II**

Simplify: (3c^2)(-6cd)^-2

**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

**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.

**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 ...

**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 ...

**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?

**english**

idk

**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 hy...

**Calc**

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

**Calc**

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

**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 minut...

**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!

**calc**

If f(x)= (3x)^(3x), then f'(x) = ? Thank you!

**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!!

**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!

**Calc**

Find the integral from 1 to 0 of arcsin(x)dx Thank you!

**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!!

**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!!

**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!!

**goverment**

For the first eleven years of its existence, the United States was a _____.

**macroeconomics**

a description of a specific macroeconomic phenomenon or event and how it has impacted you

**hcs 341**

How can an organization forecast future staffing needs in order to maintain consistent staffing levels?

**social studies**

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

**Chemistry**

What is the percentage of potassium chloride to oxygen?

**Chemistry**

What is the percentage of potassium chloride to oxygen?

**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!

**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?

**Calc**

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

**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?

**calc**

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

**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)

**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)?

**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!

**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

**Calc**

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

**Calc**

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

**Calc**

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

**Calc**

What is the antiderivative of dy/dx = x/(x^2 + 1)?

**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.

**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

**HUMAN RESOURCE MANAGEMENT**

When writing informative and positive messages, you should include reader benefits when:

**human resource management**

Informative and positive messages are not necessarily short: Instead , the length of a message depends on all the following EXCEPT:

**math**

Look at a multiplication table.

**problem solving**

Try to first multiply it. You should get your answer correct that way. :-)

**Writing**

what is your guess?

**REPORT CARD QUESTION**

cooll!

**Measurments**

What don't you understand the inches or the millimeters?

**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. :-)

**Math**

What grade is he in?

**Math**

Okay is it 1 or i?

**Math**

Your question is not a question. What are you asking help for? 52 and what number?

**8th grade science**

help?

**8th grade science**

Is predator-prey the most important ecological relationship? Thanks everyone!

**8th grade science**

YESS!!! you are a life saver! ;-)

**8th grade science**

HELP!!!

**8th grade science**

On one of my tests they are asking me if Symboin pandora has a symbotic reletionshio with the Norway Lobster. In my lesson the answer is yes but with the NORWEIGAN lobster. Is this a typo or are the two lobsters the same lobster but with different names? I am soooo.... CONFUSE...

Pages: <<Prev | 1 | 2 | **3** | 4 | 5 | 6 | Next>>