Tuesday
April 28, 2015

Posts by Dan


Total # Posts: 949

Math(Please help)
Use the functions f(x)=1/8x-3 and g(x)=x^3 to find the indicated value or function. (g^-1 X f^-1)(-3)
February 19, 2009

Pre-cal
Compare the graph of the function with the graph of f(x)=|x| y=|-x|
February 18, 2009

trig
how do i get the degree for (tan+1)(tanx-2)=0 in the interval of 0 is less that or equal to x and x is less then or equal to 360
February 11, 2009

Pre-Cal
What is the domain of f/g? f(x)= x over x+1, g(x)=x^3 I have no idea how to figure this out!
February 10, 2009

Math
Find the domain and range of the functon: f(x)=1/2 |x-2|
February 8, 2009

Marine Science
Organisms on a rocky shore compete for all of the following except? 1) Affection 2) Nutrients 3) Space 4) Light I think the answer might be light but im not sure.
February 4, 2009

6th grade_Science/Math
Imagine there is a large boulder on the edge of a shoreline. If a wave period is 15 s long. how many times is teh boulder hit in a year? Thank you
January 27, 2009

math
The weights (in pounds) of a sample of five boxes being sent by UPS are: 12, 6, 7, 3, and 10. a. Compute the range. b. Compute the mean deviation. c. Compute the standard deviation.
January 9, 2009

Biology
What cell structure/organelle would be especially common in i)cells lining the respiratory passages? ii)white blood cells that engulf and detroy invading bacteria iii)enzyme (protein) secreting cells of the pancreas
January 4, 2009

Physics
Which would be more effective in breaking a rope: 2 people pulling a rope tug-of-war style, or 2 people pulling the same end of the rope with the other end tied to the wall?
December 9, 2008

math
according to some students what is the true purpose of homework
December 5, 2008

spanish
I need help.. i need to make 4 sentences.. With... (Miro) (Miramos) El, la, al, a la empleado video carpeta profesora I dont care how u make them i just need help..
December 2, 2008

Physics
A 0.250 kilogram box has a speed of 2m/s when it is 1.2 meters from a second mass. It is sliding on a table with a coefficient of friction of 0.20. The box collides and sticks to a 0.5kg box that sits on the end of the table, causing the boxes to fall. How fast are the boxes ...
November 18, 2008

Calculus
Show that y= x + sinx-pi satisfies the initial value problem dy/dx=1 + cos x, y(pi)= 0 i don't understand how to do this problem. i don't know where to begin.
November 18, 2008

college
What is the probability that 4 rolls of fair die will show three 4's? the answer is 0.015, but I don't know how to get it.
November 17, 2008

4th grade
temperature - noun
November 17, 2008

probability
What is the probability that 4 rolls of fair die will show three 4's? the answer is 0.015, but I don't know how to get it.
November 17, 2008

probability
What is the probability that 4 rolls of fair die will show three 4's? the answer is 0.015, but I don't know how to get it.
November 17, 2008

Math
3 choices x 5 choices = 15
November 17, 2008

CALC
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

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

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