# Posts by erica

Total # Posts: 618

**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 ...

**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.

**History**

Was the answer to this question ever determined?

**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 ...

**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 -Received cash from investment made by owner,$15000. Received cach providing accounting services, $8000. Billed customers on account for providing services, $4000. Paid Advertising expense 400. Received 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 ...

**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 ...

**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 ...

**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?

**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 ...

**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 ...

**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!!

**chemistry**

increase

**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**

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.... ...

**Calc**

Set up and evaluate the definite integral for the area of the surface generated by revolving the curve about the y-axis. y = cube rt. (x) + 2 Thank you so much!!

**Calc**

Set up and evaluate the definite integral for the area of the surface generated by revolving the curve about the x-axis. y = (x³/6) + (1/2x), 1≤ x ≤ 2

**Calc**

Find the arc length of the graph of the function over the indicated interval. y = (x⁵/10) - (1/(6x³)) , [1,20] Thank you so much!!

**Calc**

What is the area bounded by the graphs of y = 4x - x² and y = x? Thank you!!

**Calc**

What is the area of the region located between the graphs of y = -x² + x + 4 and y = 2? Thank you so much!

**Calc**

How do you integrate sin²x?

**Calc**

Find the volume of the solid generated by revolving the region bounded by the graphs of the equations about the x-axis. y = sin x, y = 0, x = 0 I just need help setting up the formula. So far I got V= the integral from 0 to pi of [(sin²x) - 0²]dx. Is that correct? ...

**physics**

I do not know

**Calc**

The slope of a curve at each point (x,y) is given by 4x - 1. Which of the following is an equation for this curve if it passes through the point (-2,3)? A) y=4x²-x-15 B) y=x²-4x-9 C) y=2x²-x-7 D) y=2x²-x E) y=2x²-x+7

**Calc**

Given function f defined by f(x) = ( 1- x)³. What are all values of c, in the closed interval [0,3], that satisfy the conditions of the Mean Value Theorem?

**Calc**

A rectangular box, with a square base and open at the top is to be constructed. If the volume of the box needs to be 108 cubic feet, what is the minimum surface area?

**Calc**

Various values for the derivative, f'(x), of a differentiable function f are shown below. x=1, f'(x) = 8 x=2, f'(x) = 4 x=3, f'(x) = 0 x=4, f'(x) = -4 x=5, f'(x) = -8 x=6, f'(x) = -12 If f'(x) always decreases, then which of the following ...

**Calc**

y = x^2 y = 6 - x Find the area of the region by integrating (a) with respect to x and (b) with respect to y.

**Calc**

y = x^2 y = 6 - x Find the area of the region by integrating (a) with respect to x and (b) with respect to y.

**Calc**

If y = (cos²x)/(1 + sin x), then dy/dx = ?

**Calc**

If y = (sec x)/(tanx), then dy/dx = ?

**Calc**

Limit as x approaches +∞ of x sin (1/x)