Saturday

February 28, 2015

February 28, 2015

Total # Posts: 929

**calculus**

find the following derivatives: f(x) = (2x+5)/(x^2-3) f'(x)= (2)*(x^2 -3)-(2x+5)*2x/(x^2-3)^2 is that correct??? f(x)= (lnx)(cos x) f'(x)= 1/x*-sinx or do i have to use the product rule?? thank you.
*November 9, 2008*

**calc**

t 2 4 6 8 10 12 v(t) 44 42 41 40 37 35 the velocity in the table is decreasing 2 </= x </= 12. Using n=5 subdivisions, approximate the total distance traveled for: a) an upper estimate b) a lower estimate i'm not quite sure what the question is asking. i don't ...
*November 2, 2008*

**Calculus**

t 2 4 6 8 10 12 v(t) 44 42 41 40 37 35 the velocity in the table is decreasing 2 </= x </= 12. Using n=5 subdivisions, approximate the total distance traveled for: a) an upper estimate b) a lower estimate i'm not quite sure what the question is asking. i don't ...
*November 2, 2008*

**math**

im not 1 of the pros at answering the questions but i think i can help. y=4/9x-7/9. i got this cuz it has to be y=mx+b. when u move the 9y to the other side of the = it becomes negative and the same goes for the 4x. then you have to divide the -4x and the 7 by the -9. the x ...
*November 1, 2008*

**Physics**

A spring with spring constant k=100 (N/m) is at its equilibrium length. a) How much elastic potential energy is stored in the spring? b) The same spring is stretched so that it is 6.0 cm longer than its equilibrium length. How much elastic potential energy is stored in the ...
*November 1, 2008*

**4thgrade math**

it would be 9 because the number after the point (decimal) is less than 5.
*November 1, 2008*

**math**

While shopping for an air conditioner, Adam Bryer consulted the following table giving a machines BTUs and the square footage that it would cool. Ft^2(x) BTUs(y) 150 5000 175 5500 215 6000 250 6500 280 7000 310 7500 350 8000 370 8500 420 9000 450 9500 a. Find the equation for ...
*October 31, 2008*

**calculus**

what is the derivative of 1/x??
*October 30, 2008*

**calc**

i got -1/x^2 but i don't think that is correct.
*October 30, 2008*

**calc**

what is the derivative of 1/x??
*October 30, 2008*

**Calc**

When you cough, your windpipe contacts. The speed v, with which air comes depends on the radius,r, of your windpipe. If R is the rest radius of your windpipe, then for r </= R the speed is given by: v=2(R-r)r^2 i got the derivative: v'=4rR-6r what do i do next??
*October 28, 2008*

**chemistry**

How do you express the number 6 as two significant figures?
*October 28, 2008*

**Chemistry**

If the column of water in the water bormeter rose to a height of 35 feet, what would the atmospheric pressure be in mm Hg?
*October 21, 2008*

**Math**

Fluffy, Spot and Champ combined dog years is 91. Spot is 14 years older than Fluffy, Champ is6 years older than Fluffy. Write and equation and solve how old Fluffy is? Thanks
*October 16, 2008*

**6th grade**

Thank you. Dan
*October 13, 2008*

**6th grade**

The left and right - hand margins on a sheet of paper are both 1.25 inches wide. The total width of the sheet t of paper is 8.5 inches. Write and solve an equation to find the width of the text area that lies betwen the margins.
*October 13, 2008*

**chemistyr**

84.86
*October 8, 2008*

**10th grade Literature**

2. "THEY" are the humans of Earth. The implication is that astronomers on Mars noticed the nuclear destruction of planet earth. This poem was likely written before we knew that there was no intelligent life on mars. It's meant to convey a sense of irony that ...
*September 21, 2008*

**Math**

Two different isosceles triangles with perimeter 4a+b? Is this a right angle isosceles triangle?
*September 17, 2008*

**American Government**

How did the Founders expect to promote civic virtue in a country as large and diverse as the United States?
*August 22, 2008*

**chemistry**

A balloon filled with helium has a volume of 30.0 L at a pressure of 100 kPa and a temperature of 15 degrees C. What will the volume of the balloon be if the temperature is increased to 80 degrees C and the pressure remains constant?
*August 4, 2008*

**chemistry**

What is Dalton's law of partial pressures? Explain how this law relates to the fact that mountain climbers must carry tanks of oxygen when scaling high peaks.
*August 4, 2008*

**chemistry**

okay. The 10 g mass was throwing me off.
*August 4, 2008*

**English**

It will give me a sense of accomplishments. is this a grammatical correct sentence?
*July 27, 2008*

**health**

what are three disadvantages of HIPAA?
*July 16, 2008*

**Algebra**

Evaluate the function at the given value of the independent variable and simplify. f(x) = 2x2 - 5x + 6; f(x - 1)
*July 3, 2008*

**economics**

How are the ways that the former Soviet Union and China have moved toward market based economies different?
*June 29, 2008*

**economics**

complex models are always better than simple ones. true or false?
*June 17, 2008*

**Social studies**

butt cakes
*May 30, 2008*

**Spanish**

Actually, it is like this (Spanish is my native language after all): Compraba- it bought compro- i buy Se comio- was eaten Quiere comerse- wants to eat esta comprando- is buying
*April 28, 2008*

**history**

Explain the politics of the consensus and explain the pragmatic political measures Eisenhower used to manage the economy?
*April 25, 2008*

**English Lit**

If you're familiar with James Baldwin please help me. I need to identify his writing style. So far I got something in between stream of consciousness and lots of poetic devices but I think I need something more concrete than that. HELP?
*April 19, 2008*

**Maths probability**

Two Fair Dice are thrown and the differance is noted.Draw the sample space.What is the probability that ther is no differance.
*April 15, 2008*

**Short Circuit Problem (Physics)**

No problem ^^
*April 12, 2008*

**Short Circuit Problem (Physics)**

emf sets top most node to emf V. Nodal at top node: (emf - V)/5 = 2A => emf = 43V ohms law at top node: (43V - 33V)/12 = Current right branch = 0.83A Current in left branch = A + 0.83 = 2.83A R = 33/2.83 = 11.66 Ohms Although, this question is a little odd because there'...
*April 12, 2008*

**accounting**

I have a project due on the Colo Company can anyone help figure out the worksheet
*April 7, 2008*

**Chemistry (reactions)**

Ch3Ch2Ch2MgBr + H2O = I just need to complete the reaction not balance it.
*April 6, 2008*

**religous**

To answer Writeacher, we didn't say that there weren't similarities, we just said that they aren't the same religion. I can say quite firmly that Judaism and Christianity are not too similar, let alone Islam and Christianity. I would not say that Jews and ...
*March 27, 2008*

**music**

I'm not entirely sure what you need help with. G major has one sharp, F sharp, and F major has a B flat. G major scale: G A B C D E Fsharp G 1 2 3 1 2 3 4 5 F major scale: F G A Bflat C D E F 1 2 3 4 1 2 3 4 I've listed the piano fingerings under the notes.
*March 19, 2008*

**oceanography**

A monster storm located 1200 km north of Hawaii generates wind waves with maximum wavelengths of 150 m. Calculate how much time you have to get to the north shore and surf the first big waves. Assume that the average depth of the North Pacific is 3800 m, and that there is no ...
*March 17, 2008*

**IT 221**

Does anyone have anything on this?
*March 14, 2008*

**Economics**

A firm with monoply power has the demand curve: P = 100 - 3Q + 4A^1/2 And has the total cost function: C = 4Q^2 + 10Q + A where A is the level of advertising expenditures. P is price, Q is output. How do I find the values of A, Q, and P that maximize the firm's profit?
*March 1, 2008*

**Algebra II**

Your solution is perfect, did you just want confirmation?
*February 29, 2008*

**Algebra II**

What exactly is your question? I don't even see a denominator anywhere :) What you have is right so far. If you want to finish that question you need to use the quadratic formula x = (-b +/- square root(b^2 - 4ac)) / 2a x = (5 +/- square root (25 + 192)) / 16 x = (5 +/- ...
*February 29, 2008*

**Geometry and Measurement**

For a right angle triangle the following equation is true: a^2 + b^2 = c^2 Where c is the hypotenuse of the triangle and a,b are the other sides (you decide which side is a and which side is b).
*February 29, 2008*

**math**

First you have to expand your terms. 7y^2 - 5y^3 - 180y^2 - 55 = -100 Collect like terms. -5y^3 -173y^2 = -45 now factor the y^2 y^2(-5y - 173) = -45 There are two solutions to this equation. y = 0 and 5y + 173 = 45 which yields y = -25.6
*February 29, 2008*

**Math**

n is the number of moles. It's usually equal to one to simplify matters.
*February 29, 2008*

**Physics**

I'm not familiar with that particular term, but mach number .85 could possibly mean 0.85 times the speed of sound.
*February 29, 2008*

**calculus**

"If the sequence An converges to 0, and each An is smaller than An-1 (i.e. the sequence An is monotone decreasing), then the series converges." In this case, An = 1 / (3n + 1) The limit as n->infinity (An) = 0 A1 = 1 / 4 A2 = 1 / 7 Therefore, by the Alternating ...
*February 28, 2008*

**Math - Slight Error**

Whoops, I read those numbers wrong. The area of two sides will be l*h and the other four will be w*h. So the total area = 2(l*h) + 4(w*h) Sorry about that :S
*February 28, 2008*

**Math**

I'm assuming length is depth. A rectangular solid has 6 sides, so the total area will simply be 6 times the area of one side. The area of one side is the area of square which is w*h. The volume of a rectangular solid is l*w*h. From Google, "The lateral area is the ...
*February 28, 2008*

**right triangles can't have decimals in the angles?**

Did you teacher actually say that's why you lost 2 marks? It might have been lack of decimal place(s) or an incorrect answer. Triangles can definitely have decimal angles.
*February 28, 2008*

**Electrostatics**

A linear charge rho L = 2.0 uC lies on the y-z plane. Find the electric flux passing through the plane extending from 0 to 1.0m in the x direction and from -infinity to infinity in the y direction. Alright, so the formula to use is: flux = (integral(integral)(Ds * dS)) where ...
*February 28, 2008*

**math**

Whoops, the answer should just be x = (4/3)^(1/3) or x = the cube root of (4/3) Bad grammar :P
*February 28, 2008*

**math**

Well 3x * x^2 = 3x^3 So now you have 3x^3 = 4 then x^3 = 4/3 so x = the cubed root of (4/3)^(1/3) Where ^ indicates "to the power of".
*February 28, 2008*

**math**

No problem :)
*February 28, 2008*

**math**

5^3 = 125 So how do we get 125^(1/3) from this? Simply take the cubed root of both sides. (5^3)^(1/3) = 125(^1/3) What then, must the cubed root of 125 be?
*February 28, 2008*

**math**

The "square root" of a number simply means the number is raised to the power of 1/2 or 0.5. So your question becomes (((125)^1/2)^4)^1/6 When you have exponents beside each other you simply multiply them. So the question becomes 125^(0.5*4*1/6) = 125^(1/3) Now what ...
*February 28, 2008*

**Logic**

Using the law of inference, prove if the below argument is valid. (P1) R -> B (P2) D V R (P3) B /D You may imply all rules of inference to figure out if it is valid.
*December 18, 2007*

**PHYSICSS.. someone help plz.**

A football is kicked at 15 m/s with an angle of 35 degrees with the ground. How long is it in the air? How far will it land? Can someone help plz... Thanks!
*December 3, 2007*

**PHSYICS HELP PLZZZZ**

A football is kicked at 15 m/s with an angle of 35 degrees with the ground. How long is it in the air? How far will it land? Can someone help plz... Thanks!
*December 3, 2007*

**Physics**

A football is kicked at 15 m/s with an angle of 35 degrees with the ground. How long is it in the air? How far will it land? Can someone help plz... Thanks!
*December 3, 2007*

**Projective Motion Problem**

Darryl Strawberry hits a baseball with a horizontal velocity of 45 m/s and a vertical velocity of 25 m/s... Find the time it takes for the ball to travel to the highest point Find the total time the ball is in flight Find the range Find the max height the ball reaches Does it ...
*December 3, 2007*

**algerbra**

find the constant of variation for each direct variation. 10y=13x and f(x)=4.5x and x+y=0
*November 26, 2007*

**SS**

both of them are able to because they are 35 or older and born in america
*November 26, 2007*

**Essay help needed please**

For many people, the image that comes to mind when they hear, the word slavery is the Transatlantic Slave Trade. I thought of the buying and selling of people, their shipment from one continent to another and the abolition of the trade in the early 1800s. But even if one knew ...
*November 26, 2007*

**Essay help needed please**

my essay is longer but it won't paste
*November 26, 2007*

**Essay help needed please**

For many people, the image that comes to mind when they hear, the word slavery is the Transatlantic Slave Trade. We think of the buying and selling of people, their shipment from one continent to another and the abolition of the trade in the early 1800s. Even if we know ...
*November 26, 2007*

**Essay help needed please**

Can some one check it Choose apiece of literature you have read and describe how it has affected you. For many people, the image that comes to mind when they hear, the word slavery is the Transatlantic Slave Trade. We think of the buying and selling of people, their shipment ...
*November 26, 2007*

**Essay Revision #6! GRADE ME!**

i would rate you 3 out of 10
*November 26, 2007*

**college essay help me**

can someone check my essay now thanks Choose apiece of literature you have read and describe how it has affected you. For many people, the image that comes to mind when they hear, the word slavery is the Transatlantic Slave Trade. We think of the buying and selling of people, ...
*November 26, 2007*

**Chem**

Ok, so I have DeltaHrxn=(X+90)-(143+90). How do you calculate the enthalpy of O2 (X above) when it is not given to you. Am I even doing that right?
*November 19, 2007*

**Chem**

Change in enthalpy problem. Consider the reaction represented below. Referring to the data in the table below, calculate the standard enthalpy change for the reaction at 25 degrees C. O3(g)+NO(g)-->O2(g)+NO2(g) Standard enthalpy of formation in kJ/mol: O3(g) 143 NO(g) 90 ...
*November 19, 2007*

**Economics**

I have to discuss the growth of modern technology's impact on transaction costs. What points do you think I should discuss?
*November 18, 2007*

**Economics**

When it comes to economic decision making, I have to discuss the importance of transaction costs. Any ideas of the main points I should discuss?
*November 18, 2007*

**music**

how many beats in a bar
*November 13, 2007*

**Physics Problems**

What is the solution?
*November 5, 2007*

**Chemistry**

The equilibrium constant for the reaction of bromine and chlorine to form bromine chloride under certain conditions is 4.7x10-2. Cl2(g) + Br2(g) --> 2BrCl(g) K= 4.7 x 10-2 What is the equilibrium constant for the following reaction under the same conditions? 1/2 Cl2(g) + 1/...
*November 3, 2007*

**Chemistry**

Thanks, that's what I got :)
*November 3, 2007*

**Chemistry**

A container initially has 0.0186 M ammonia at a certain temperature. When the system reaches equilibrium the concentration of ammonia is 0.0035 M. Calculate Kc for the following reaction as written. N2(g) + 3H2(g) --> 2NH3(g)
*November 3, 2007*

**Math-word problem**

How much work does a 120 pound boy do in climbing to the top of the Washington Monument, a climb of 550 feet? If the climb in problem 2 takes 20 minutes, what is the average horsepower produced by the boy?
*October 30, 2007*

**Math-word problem**

The head of a round piston has a pressure of 210 psi pushing down on it. The piston is 3 inches in diameter. What is the force pushing the piston down?
*October 30, 2007*

**Math-word problem**

A 3000 POUND CAR IS PUSHED 500 FEET BY THREE BOYS, A FORCE OF 60 POUNDS IS REQUIRED TO MOVE THE CAR. HOW MUCH WORK DID THE BOYS ACCOMPLISH? HOW MUCH WORK CAN EACH BOY CLAIM IF HE DID HIS SHARE?
*October 30, 2007*

**GENETICS**

With regard to pattern baldness in humans (a sex-influenced trait) a woman who is not bacld but mother is bald, has children with a bald man whose father is not bald. what are their probabilities of having the following types of families? a) their first child will not become ...
*October 28, 2007*

**chemistry**

Tungsten has been used to make light bulb filaments since 1908. The melting point of tungsten is 3422 °C and the heat of fusion is 35 kJ/mole. Calculate the entropy change associated with the melting of one mole of tungsten.
*October 24, 2007*

**English**

Trying to help with 6th grade homework. All I know is the assignment is to write mirror adjective words? Not sure what this means, any suggestions?
*October 23, 2007*

**Calculus**

So there is no way profit = price x quantity demanded because I have q=-60p+950 and Revenue or profit=-60p^2+950p. I then have to find out the profit made by selling things at 5.50, 10 , and 15 dollars. I was told to plug these numbers into -60p^2+950p to get the profit and ...
*October 14, 2007*

**Calculus**

So there is no way profit = price x quantity demanded because I have q=-60p+950 and Revenue or profit=-60p^2+950p. I then have to find out the profit made by selling things at 5.50, 10 , and 15 dollars. I was told to plug these numbers into -60p^2+950p to get the profit and ...
*October 14, 2007*

**Calculus**

I have a project and part of it has to do with revenue, demand and profit. I know that Revenue=price x quantity but can profit equal price x quantity demanded? I have both written down and I am getting confused because I was supposed to find the profit but I have the revenue ...
*October 14, 2007*

**Brit Lit.**

If anyone can help I need a iambic pentameter (10 syllables per line with 30 lines)we have to write it in 3rd person and it has to be about a student, busdriver, teacher, Janitor doesnt matter what one of those 4 examples.
*October 2, 2007*

**Business Math II**

thanks =)
*September 23, 2007*

**Business Math II**

so I don't have to do any Permutations right? just a simple Pr(E)=n(E)/n(S)
*September 23, 2007*

**Business Math II**

Photography - Two men and a woman are lined up to have their picture taken. If they are arranged at random, what is the probability that (A) the woman will be on the left in the picture? (B) the woman will be in the middle in the picture?
*September 23, 2007*

**AP English 11**

no
*September 17, 2007*

**math**

i am confused with this question. what do i need to use in order to solve this question? eliza must fence in a pool area net to a concession stand with 25 m of fencing? what was the dimensions which will maximize the pool area?
*September 9, 2007*

**Chemistry**

1) Yes, Cl2 is definitely produced, we could see it, it stung our noses and we tested the gas. I know it's annoying, but please help! 2)Thank you!
*August 24, 2007*

**Chemistry**

Two questions: 1) NaCl+H2SO4+NH3=Cl2+? 2) KF+AgNO3+NH3=? I've been agonising over these for the past few hours, but can't seem to make any headway. Please help.
*August 24, 2007*

**algebra**

solve the system by graphing x+y=4 y=2x+1 I think these are the kind that you take equation #1 and rewrite it as y = -x + 4 and do the table for it plot the dots and connect the line for it. then take equation #2 y= 2x+ 1 do the table and do the same and if the lines cross if ...
*August 14, 2007*

**algebra**

what is the ratio of the circumfrence and diameter of any circle? pi, which is 3.14159...
*July 23, 2007*

**Chemistry**

What happens to pressure when you increase the temperature Of a gas? PV=nRT if volume is constant, increasing the right side has to increase the left side. Pressure is directly related to absolute temperature, given volume is constant. Isn't this Charles' Law?
*June 12, 2007*

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