Thursday
November 27, 2014

Posts by JOshua


Total # Posts: 538

calc.
I'm having a lot of trouble with this problem: Sketch the graph and show all local extrema and inflections. f(x)= (x^(1/3)) ((x^2)-175) I graphed the function on my graphing calculator and found the shape. I also found the first derivative: (7/3)(x^(4/3)) - (175/3)(x(-2/3...
April 20, 2009

Calculus
Does the series (1+sin(n))/(10^n) from summation 0 to positive infinity converge or diverge? I let an = (1+sin(n))/(10^n) and bn = 1/10^n lim as n approaches positive infinity = an/bn = ((1+sin(n))/(10^n))/(1/(10^n))= 1+sin(n)= positive infinity. I don't know if it's ...
April 16, 2009

Calc.
Let h(x)=16-4x-(x^3) Find g(96). My work: 96= 16-4x-(x^3) (-x^3)-4x-80=0 Using the rational roots theorm, I found that x=-4 so h(-4)=96, therefore g(96)=-4. Find g'(96). My work: g'(96)= 1/(dh/dx at x=-4) 1/((-3(-4)^2)-4)= -1/52 Does this look ok? Also, my math teacher...
April 14, 2009

Calculus
For the sequences below, find if they converge or diverge. If they converge, find the limit. an=(3^(n+2))/(5^n) an=cos(2/n) an=(2^(1+3n))^1/n I am unsure about how to get started on these problems so some assistance would be great.
April 10, 2009

Physics
thanks
March 25, 2009

Physics
Could some one tell m if this is right? 1)Does currend flow through a resistor or across a resistor in a series circuit? THROUGH 2) Is a voltage establishes through a resistor or across ? ACROSS PARALLEL CIRCUITS 1)there is a voltage drop of 6volts across each 2-Ù ...
March 25, 2009

SEX EDUCATION
NO AT ALL YOU SEXMACHINE
March 25, 2009

italian
I realy dont want this with a computer translation because it never comes out the right way could someone translate it for me? If I won 1.000.000 dollars I would go to Sardegna with all my friends for a whole year.To get their since we live in America we would take a plane ...
March 23, 2009

Calculus
I wanted to confirm that I solved these problems correctly (we had to convert the polar curves to Cartesian equations). 1.rcos(theta)=1 x=1 2.r=2*sin(theta)+2*cos(theta) r^2=2rsin(theta)+2rcos(theta) x^2+y^2=2y+2x (a little unsure what do next if this is correct) 3.r=tan(theta...
March 13, 2009

science
what is the resistance of a 200w bulb when supplied w/a voltage of 100v and has a current of 2.0 amps?
March 3, 2009

Social Studies
Research and Present findings on the countries that annually perform the hajj and it must be in a five year time?
February 18, 2009

Physicis
so it would be something like this. a. tan theta=1/2(65)/750 tan theta=0.043 theta=tan-1(0.043) theta = 2.48 degree's
February 15, 2009

Physicis
Given: Two teams of children are well-matched, and they pull on the rope with exactly the same force. They have placed a 65n weight at the center of the rope. The teams first pull with 750n of force each, then in an heroic effort to straighten the rope, pull with 1500n of ...
February 15, 2009

Math
Factorise as far as possible into Prime Factors: 5x^8 - 80y^4
February 11, 2009

SPANISH
Hola Tu me gustas mucho
February 2, 2009

math
an object accelerates only if the forces acting on it in one drection are greater than the forces in the opposite direction, all of the following objects will accelerate except
January 17, 2009

4th Grade Eng
Yesterday some people were practicing musical numbers. were practicing--is that the correct helping verb for the sentence
January 9, 2009

english
were
January 8, 2009

4th grade english
were
January 8, 2009

4th grade english
Yesterday some people (was, were) practicing musical numbers.
January 8, 2009

algebra
A train left Podunk and traveled north at 75km/h. Two hours later, another train left Podunk and traveled in the same direction at 100 km/h. How many hours had the first train travelee when the second overtook it?
January 8, 2009

9th grade
It's not a buoyant girl ant
January 7, 2009

social studies
in what city was the declaration of independece approved?
January 3, 2009

I know the answer
ALINEOFCHORUSGIRLS
December 3, 2008

4th grade English
What would be the possessive form of friends in the sentence--The homework of my friends.
November 23, 2008

chemistry
I need help with this question. What should be the cell potential if the [Cu2+] is 1.0 x 10-5 mol/L? please help
November 11, 2008

chemistry/please double check
Hi, I just need to know if I finally got this exercise right. Calculate the amount of heat in kilojoules released when 50 grams of steam at 125 Celsius are converted to 50 grams of ice at -125 Celsius. so, qw= 50*4.184J/g C (125 C-o)= 26.15 x 10^3 qi= 50*2.09*(-125)=-13.065 KJ...
October 28, 2008

Help with math
Hi, adding on to Manny's response, a simplified answer would be 19/20, by diving both the numerator (95) and denominator (100) by 5. Thanks. Hope I helped.
October 28, 2008

chemistry
sorry it was a typo and yes they didn't ask for the freezing point thanks so much
October 28, 2008

chemistry
so the molecular formula will be? c= 3.30/3.29=1, H=7.75/3.29=2, O=3.29/3.29=1 2(C3H7O3)= C6H17O6 Delta T= Kf * m T= -1.86 C/m * 0.33m/g T= o.613 C am i correct?
October 28, 2008

chemistry
I need to know if I have th right molecular formula for Sorbito 39.56g C 7.75g H 52.7g O Empirical Formula is CH2O 30.026 amu how I how calculate the molecular mass and how I figure out the melecular formula? please help
October 28, 2008

chemistry
thanks
October 27, 2008

chemistry
for K3PO4 is it potassium phophate or tripotassium phosphate? or both? confuse which one we use more often?
October 27, 2008

Spanish
Gamberras? what does it mean? never heard that word before? help
October 27, 2008

Spanish
1. por sus habilidades de actuacion(put a period on top of o for actuacion. 2. y usualmente adquiere roles de muchachas de gran temperamento in peliculas de acion. 3. Ella da una actuation expectacular...don't traslate literally it has to have the same meaning as it does ...
October 27, 2008

chemistry
what are the properties affected by intermolecular forces? please help
October 27, 2008

Chemistry/please check
Calculate the amount of heat in kilojoules reased when 50 of steam at 125 C are converted to 50 grams of ice at -125 C. AHsteam = m * Cp steam * At q1= 50g * 4.184 J/g C * (125-100)C= 5.23 x 10^J q2= m * AH 50g * 5230 J/g = 2.61 x 10^5 J q3= 50g *4.184 J/g C * (100-0)C= 2.10 ...
October 27, 2008

chemistry
is this the right anser? for this problem please let me know thanks calculate the amount of heat in kilojoules released when 50 grams of steam at 125 C are converted to 50 grams of ice at -125 C so 50 grams of H2O Ti= 124 C Tf= -125 C q=? J=? q=m *Cp * At J= 50g * 4.184J/g C...
October 27, 2008

chemistry
oh i see m ok thanks
October 27, 2008

chemistry
if so then the solution will be Delta T= Kf * M T= 7.0 C/m * O.474mol/g T=3.32 C The freezing point of the solution will be 5.7 C - 3.32 C = 2.38 C please let me know if this is correct? please
October 27, 2008

chemistry
from the texbook K(f)= 5.12 C/m but from the exercise is 7.0 C/m which one should i use to solve fro the freezing point? please help
October 27, 2008

chemistry
thansk
October 27, 2008

chemistry
i need to know if I am in the right tract please let me know...I am calulating the molality of the following exercise so I could be able to apply the formula T=Kf * molality calculate the freezing point of a solution containin 12.2 grams of benzoic acid, dissolved in 250 grams...
October 27, 2008

Chemistry
calculate the freezing point of a solution containing 12.2 grams of benzoic acid, dissolved in 250 grams of nitrobenzene. the freezing point of nitrobenzene is 5.7 celsius and its freezing point depression constant is 7.0 celsius/m. please help
October 27, 2008

Chemistry
thanks I think i got it now
October 27, 2008

Chemistry
Calculate the amount of heat in kilojoules released when 50 grams of steam at 125 C are convert to 50 grams of ice at 125 C please help
October 27, 2008

Chemestry
where you got the 7.7 from? and how you calculate the molality for it. I am stuck please help
October 26, 2008

History
I just have one more question on this matter; does the Congress's power to declare treason to a person/ establish inferior courts in states pertain to the federal territories as well?
October 19, 2008

History
Thank you for your help.
October 19, 2008

History
What authority does Congress have over other states according to Article III of the Constitution? Over federal territories?
October 19, 2008

Math
Thanks drwls for the good explanation =)
October 17, 2008

Math
Hi drwls, Just wondering, does the word "under" in the question influence the question at all? Thanks for your reply! =)
October 17, 2008

Math
Hi guys, In the question "It is given that P (0, 3), Q(7, 5), R(9, -2) and S are vertices of a square. A circle A passes through the points P, Q, R and S. Find the equation of this circle. Hence or otherwise find the equation of circle B which is the image of A under the ...
October 17, 2008

Writing prompt
Hi Jherica Holland, You have posted several questions regarding the 18th century. What I suggest is for you to search "the 1800's" on Google. There are some personal recounts which you could use as reference material. Hope I helped. Thanks! :)
October 16, 2008

Chemistry
Hi Bo, we have several indicators, including litmus, universal indicator, bromothymol blue, methyl orange, and screened methyl orange. There are many, and the list can go on forever, but these are most commonly used. The best, in my case, would be universal indicator or litmus...
October 16, 2008

writeing promot on the 1800's
O_o didn't consider that haha :)
October 16, 2008

writeing promot on the 1800's
Hi brittany lasseigne, what do you need help with? There are many points of comparison you could consider jotting down. You could try to talk to grown ups who have lived through the 1800's as children. Here's some starting material for you (Please do not copy, this is ...
October 16, 2008

Math Calculus
Thanks ^^
October 16, 2008

Math Calculus
Hi, I don't have any question specifically but I'm very confused on this. In integration to find area under/above a curve, when do you integrate: 1) with respect to y 2) with respect to x 3) using x coordinates 4) using y coordinates Thanks for your help! :)
October 16, 2008

chemistry
Hi Anonymous, Truthfully speaking I don't know much about ozone cracking. However, seeing that no one has answered your query for almost two hours, I will try to help. The definition of ozone cracking as stated in Britannica Encyclopedia is as such: "Atmospheric ozone...
October 16, 2008

chemistry
Hi Lili, I'll try this one. You could add silver carbonate to the solution. A white precipitate is produced, while a colorless, odorless, gas is evolved which produces a white precipitate in limewater (calcium hydroxide). Hope I helped! :)
October 16, 2008

Wellness, puberty
might not*, spelling error.
October 15, 2008

Wellness, puberty
Hi Max, well, in short, we need the knowledge for adulthood after marrying etc. Also, this knowledge is classified as general knowledge, some might need it, some might now :) Though most do, like how many people are reliant on common knowledge
October 15, 2008

math-3rd grade
together with 1100 + 1600, 1100 - 500, and I'm not sure if you also want to include those with negative answers..
October 15, 2008

math-3rd grade
Oops, missed out some equations such as 500 + 1600, sorry about that
October 15, 2008

math-3rd grade
Hi elaine, Yup, that is all correct. Well done!
October 15, 2008

Math
Hi Tina, A palindromic number is a symmetrical form, in this case, xyx, where x has to be 2 as the number is between 200 and 300. We'll ignore the y to move on to finding the x. Create two numbers where the difference of the hundreds place = 2. For example, 9y9 and 7y7. Or...
October 15, 2008

calculus
Hi Meghan, If you differentiate a constant (i.e. any number, fraction or yeah...a constant), you always get 0. Hope I helped :)
October 14, 2008

Math
You're welcome ^^ :)
October 14, 2008

Math
Okay, we'll do it by completing the square. :) From 3x^2 + 4x = 224, x^2 + 4/3 x = 224/3 x^2 + 4/3x + 4/9 = 224/3 + 4/9 (x+2/3)^2 = 75/1/9 x + 2/3 = square root of 75/1/9 x + 2/3 = 8/2/3 or -8/2/3 x = 8 or -9/1/3( Not applicable as positive integer cannot be a negative ...
October 14, 2008

Math
Your formula is correct. Assuming you add up the 3x and x to form 4x, you have to use the general solution of a quadratic equation. Do you know how to use it? =) By the way, x should be 8 if you use it right.
October 14, 2008

Mathematics
Thanks for the help =) Clear and detailed explanation.
October 14, 2008

Mathematics
Hi there, Can someone help me with the question: "Prove that the value of 7sinx +3cos2x cannot be greater than 5/1/24 for all values of x between 0 degrees and 360 degrees" Thanks lots. =) I've already simplified 7sinx + 3cos2x into (2sinx-3)(3sinx+1).
October 14, 2008

5th grade math
i am a number less than 10.my hundreds digit is 3 more than my thousands digit,my tenths is 2 less than my hundreds and my ones is the sum of my tenths and hundreds digits.what number can i?
October 10, 2008

rounding decimals
whay is the difference between rounding decimals to the greatest to the nearest whole
September 7, 2008

ecology
WHICH WEATHER SITUATION WILL BE THE LEAST COMFORTABLE FOR A LONG DISTANCE RUNNER? A.20* CELCIUS (68f) WITH RELATIVE HUMIDITY OF 40% B. 20* CELCIUS (68f) WITH RELATIVE HUMIDITY OF 90% C.25* CELCIUS (77 f) WITH RELATIVE HUMIDITY OF 90% D.35* CELCIUS (95 f) WITH RELATIVE HUMIDITY...
September 6, 2008

biology
what is the the equation for photosynthesis?
August 4, 2008

Math
Differentiate population from sample
June 12, 2008

geometry
what are the problems?
May 31, 2008

geometry
What are if then statments .Ill need examples please .its for a project .
May 28, 2008

HELP WITH MATH
Sorry the caps lock was on. Can you help me with this pre calculus question. I'm not quite sure how to do this. Here are the instructions. Find the area between each curve and the x-axis for the given interval: y=2x^2+x+1 from x=3 to x=6
May 14, 2008

chemistry
Suggest a type of reaction and the conditions required to breakdown polyamides into their monomers.
May 7, 2008

Psychology-Opinions wanted
i love psychology
May 1, 2008

physics
What is the wavelength of a proton traveling at a speed of 6.87 km/s
April 22, 2008

trig
What kind of reflections are the following trig functions? y = 3cos(x-1) y = sin(-3x+3) y = -2sin(x)-4
April 21, 2008

trig
What kind of reflections are the following trig functions? y = 3cos(x-1) y = sin(-3x+3) y = -2sin(x)-4
April 20, 2008

trig
y = 3cos(x-1) Shift along x: Shift along y: Kind of reflection:
April 20, 2008

us history
Thanks, much appreciated, very nice of you to look.
March 12, 2008

us history
Is there any way someone can provide me with either a synopsis, or a link to a synopsis to the lincoln steffens book The struggle for self-government? Thanks
March 12, 2008

math
s^2 - s - 6 What you're looking for is a number that when you multiply it, it equals -6 and when you add them it equals -1. these values -6 and -1 are derived from the equation. so number could be --> -/+ 3, -/+ 2 but since there's only one way of getting -1 when ...
March 7, 2008

Math
( 2 3/4 miles ) / ( X feet) = ( 1 mile)/ ( 5280 feet ) then cross multiply (2 3/4 mi)*(5280 feet)= (x feet)(1 mi) (2 3/4 )(5280) = x feet that equals your total feet for 2 3/4 miles.
March 5, 2008

math
7,2 ---> 2,7 5,4 ----> 4,5 1,8 ----->8,1 9,0 -----> can't be reversed because it doesn't become a two digit number. 3,6 ----->6,3 ----------------------------------- all these two digit numbers add up to 9, and if reversed, you should subtract 72- 27= ...
March 5, 2008

chemistry
Match the correct mole ratio to the substances in the reactions below. carbon monoxide to iron in the reaction: Fe2O3 + CO ==> Fe + CO2 water to manganeese(II) chloride in the reaction: HCl + MnO2 ==> H2O + MnCl2 + Cl2 sodium to oxygen in the reaction: Na + O2 ==> ...
February 29, 2008

geography
how do i find countries with rank classes?
February 28, 2008

chemistry
When 0.627 g of Ca metal is added to 200.0 mL of 0.500 M HCl(aq), a temperature increase of 102C is observed. Assume the solution's final volume is 200.0 mL, the density is 1.00 g/mL, and the heat capacity is 4.184 J/gC. The molar heat of reaction, H rxn, for the reaction ...
February 24, 2008

math
2. since you want to know for 20 days, how much gas you waste, 20*( 1 1/2) = 30 So , you waste 30 gallons of gas in 20 days, How much money do you spend on 30 gallons of gas. 30*($2)= $60 for 30 gallons of gas which covers 20 workdays)
February 23, 2008

math
1. its a basic subtraction question. (3/4)-(1/2)=1/4 you subtract because he sold it.
February 23, 2008

math
(3/4)^(-1). Just switch the fraction to 4/3 , because its the whole fraction raised to -1. if ( 3^(-1) ) / 4 ==> 1/(3*4)=1/12
February 23, 2008

math
-7^ (-2), put it divided by 1. -1/(7^2) when you place the exponent to the denominator, change the sign, same goes if you have a negative exponent on the denominator, bring it to the numerator and change the sign. -1/49
February 23, 2008

algebra
(m+5/6)= -19 (m+5/6) *6 = -19 *6 (m+5) -5= -114 -5 m= -119
February 17, 2008

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