Saturday

November 28, 2015
Total # Posts: 1,489

**calculus**

thanks!
*February 21, 2009*

**calculus**

Find the exact value of: cos(arctan(2) + arctan(3)) Please explain how you got your answer. I have the answer, but I don't know how to get to it.
*February 21, 2009*

**i lied. very quick calc problem.**

f(x) = abs(sin(x)), -pi less than or equal to x less than or equal to pi g(x) = x^2 let H(x) = g(f(x)) i got that H(x) would equal sin^2(x). THIS IS WHERE I AM STUCK! find the domain of H. do i still need to account for "-pi less than or equal to x less than or equal to ...
*February 20, 2009*

**last calc question, i promise!**

the second one would be x = 2, resulting in the original point (2,1), i think. but other than that, thank you sooooo much!
*February 20, 2009*

**last calc question, i promise!**

ALSO ALSO ALSO - on my first calc question (a couple posts down!), i added more to the problem that i forgot, so i need help with that too.
*February 20, 2009*

**last calc question, i promise!**

i mean: do i just set (-1-y)/(x+4y) equal to -1/3 AND use the original formula to come up with an answer? like a two-variable system?
*February 20, 2009*

**last calc question, i promise!**

given the curve x + xy + 2y^2 = 6... a. find an expression for the slope of the curve. i got (-1-y)/(x + 4y) as my answer. b. write an equation for the line tangent to the curve at the point (2,1). i got y = (-1/3)x + (5/3). but i didn't any answer for c! c. find the ...
*February 20, 2009*

**calc again!**

thank you sososososo much! i was pretty sure of these, but i wanted to double-check.
*February 20, 2009*

**calc again!**

i got answers for this one, but i feel like i did something wrong. f(x)= 2x+1 when x is less than or equal to 2 (1/2)x^2 + k when x is greater than 2 1) what value of k will make f continuous at x = 2? my answer: i got k = 3 because it would make the two parts of the function ...
*February 20, 2009*

**calculus please**

i forgot the part that said "for -pi is less than or equal to x is less less than or equal to pi" this was attached to the f(x) - does it change the answer? the domain?
*February 19, 2009*

**calculus please**

given f(x) = abs(sin x) and g(x) = x^2 for all real x: 1) let H(x) = g(f(x)) and write an expression for it. 2) find domain and range of H(x). 3) find an equation of the line tangent to the graph of H at the point where x = pi/4.
*February 19, 2009*

**Algebra**

3) ab+mn+an+mb ab + an + mn + mb a(b + n) + m(n+b) (a + m)(b + n)
*February 19, 2009*

**Algebra**

6) P = 22 A = 24 2l + 2w = 22 lw = 24 l = 24/w 2(24/w) + 2w = 22 48/w + 2w = 22 48 + 2w^2 = 22w w^2 - 11w + 24 = 0 (w - 8)(w - 3) = 0 w = 8 or 3 l = 3 or 8 dimensions = 3 x 8
*February 19, 2009*

**Algebra**

4) GARDEN width = w length = w +5 GARDEN w/CEMENT WALK width = w + 6 length = w + 5 + 6 = w + 11 a = 546 ft sq. a = lw a = (w+6)(w+11) 546 = (w+6)(w+11) 546 = w^2 + 17w + 66 0 = w^2 + 17w - 480 w = (-17 +/- sqrt(289 - 4(1)(-480))/2 w = (-17 +/- sqrt(289 + 1920))/2 w = (-17...
*February 19, 2009*

**French**

Can you please unscramble these letters into 4 words with this spacing. xxx xxx xx xxxxxxxx? CPOBETULEEIQSAUL Thank you
*February 17, 2009*

**Organic chemistry**

Write contributing (important) resonance structures for each of the following compounds and predict their relative C=O vibrational frequencies based on the importance of the contributing resonance structures. List in them order from highest to lowest frequency. a.) ...
*February 17, 2009*

**chemistry**

I am trying to synthesize CH3CH2CH2CH2CL from only 2HC=CH2, and am unsure about which mechanism to use, any ideas?
*February 16, 2009*

**chemistry**

I am trying to synthesize CH3CH2CH2CH2CL from only 2HC=CH2, and am unsure about which mechanism to use, any ideas?
*February 16, 2009*

**math**

f''(x) = 24x^2(x^2-1) + 6(x^2-1)^2 when is the graph of f concave upward?
*February 11, 2009*

**Organic chemistry**

Suggest an appropriate reducing reagent for the following substrates and predict the product of the reaction: a) 2-hexanone b) ethyl 4-nitrobenzoate (reduction of the nitro group) c) hexanal
*February 7, 2009*

**history**

oh wow, thank you so much!
*February 5, 2009*

**history**

i have a bunch on her rule in my history notes, but i wanted some extra information and she apparently doesn't exist by that name online! she ruled china in place of several child rulers and ruled during a war in maybe the late 1800s? that's all i have and i need more.
*February 5, 2009*

**history**

i really need to know who zuxi is and google isn't coming up with anything and for some reason, my last question was deleted. help please?
*February 5, 2009*

**history**

Why did westernization fail in the Ottoman Empire?
*February 5, 2009*

**chemistry another Q**

Which, 9-fluorenol or 9-fluorenone, would have higher Rf value on a silica gel plate with 30% acetone/70% hexane at the eluent? Explain.
*February 2, 2009*

**chemistry**

Calculate the amount (volume) of 5.25% (wt./vol.) NaOCl solution (commercial bleach) required to oxidize 100mg of 9-fluorenol to 9-fluorenone. Whenever appropriate, use balanced chemical equations as a part of your calculation.
*February 2, 2009*

**history**

Was Westernization the best policy for China, Japan, Egypt, and the Ottoman Empire? i don't need a direct answer, just links to websites that could help me out with this. google didn't come up with anything for me.
*January 28, 2009*

**how children learn**

according to carl jung what are the two main ways that people process information
*January 19, 2009*

**Calculus**

Got a midterm worksheet. Realized how confused I am. Here are some questions: lim x^3 + 12x^2 - 5x/5x x->0 Find the indicated limit: lim 11x/absolute value x x->0+
*January 19, 2009*

**calculus**

Consider curve given by x^2+ 4y^2= 7 + 3xy.. Three part question A) show that dy/dx = 3y-2x/8y-3x B) Show that there is a point P with x-coordinate 3 at whiich the line tangent to the curve at P is horizontal. Find the y-coordinate of P. C) find the value of d^2y/ dx^2 at the ...
*January 11, 2009*

**Calculus**

Find: 1)x^2-y^2=15, normal at (-8,7)
*January 11, 2009*

**Eth125**

What was the result of your IAT, and do you feel that the test produced valid results in your case? o In your opinion, is it difficult to accurately measure prejudice? Why or why not? o Describe other measurements sociologists use to calculate prejudice
*January 11, 2009*

**Calculus**

I rewrote the quesion y = sqrt (4 + sin 10x)
*January 8, 2009*

**Calculus**

y = sqrt (4 + sin 10x)
*January 8, 2009*

**Calculus**

More questions on - finding dy/dx 1) y = sqrt 4 + sin 10 x - I am lost again 2) y = 10/sin x answer: - 10 csc x cot x 3) y = sin x/ 8x
*January 8, 2009*

**Calculus**

Need help to find dy/dx: 1) y = (sin x) ^-1/3 answer dy/dx = - 1/ 3(sinx) ^4/3 2) y = sqrt 8 + sin(6x) answer - lost
*January 8, 2009*

**spelling**

brother is to mother like fly is to? 4 letters and must include scr spr str or thr
*January 7, 2009*

**Calculus**

Answer ? - impicit differentiation Find dy/dx & d^2y/dx^2 y^2 - x^2 = 2 is the answer dy/dx=x/y; d^2y/dx^2= y^2-x^2/y^2
*January 7, 2009*

**Calculus**

I did miss the sign but would the answer be: 7x^6 - ----- csc^2y
*January 7, 2009*

**Calculus**

Here's another one - I think that I am starting to understand it. Find dy/dx by implicit differentiation: x^7 = cot y My answer is csc^2y / 7x^6
*January 7, 2009*

**Calculus**

Thanks Remy. I have one more - 2y + 9xy-4=0 I got -9y/2 + 9x
*January 7, 2009*

**english**

Neither Shanti nor Neelima have an extra pen. I think
*January 7, 2009*

**Calculus**

I am lost. Find dy/dx by implicit differentiation. 1) 5y-2x^2=x-3
*January 7, 2009*

**PHysics**

describe briefly how a generator works. Well, I'm in the electricity unit of my course, so would this mean I have to describe how electricity's generated?
*December 28, 2008*

**english**

annagrams aeiifglnhpwystThis is an event that will never happen. However, I suppose it could on any given Saturday Night. Here are your letters, you will have 3 left over. A E I I F G L N H P W Y S T
*December 23, 2008*

**english**

solve this puzzle make two words you will have one letter left. aeeioumnrrstv
*December 18, 2008*

**physics**

In the figure below, a uniform sphere of mass m = 2.50 kg and radius r = 2.4 cm is held in place by a massless rope attached to a frictionless wall a distance L = 10.2 cm above the center of the sphere. (a) What is the tension in the rope? N (b) What is the force on the sphere...
*December 13, 2008*

**physicscalculus**

An automobile with a mass of 1310 kg has 3.10 m between the front and rear axles. Its center of gravity is located 1.78 m behind the front axle. The automobile is on level ground. (a) Determine the magnitude of the force from the ground on each front wheel (assuming equal ...
*December 13, 2008*

**english**

i have to devise a writing exercise which has to involve all children working on writing one text.so i need some ideas
*December 12, 2008*

**english**

hello:)i have to give my class a writng exercise which has to involve all children.they all have to work on writing out one and the same text?any ideas?
*December 12, 2008*

**math**

97.3 is 7% of what number?
*December 12, 2008*

**math**

roberto has 22% of his pay withheld for deductions. if he earns $680 per week, what amount is withheld?
*December 12, 2008*

**sci/275**

Raw carrot 52 calories per serving. Energy Calculator Trophic level Type of producer or consumer Total energy available from previous level (100%) Energy from total gained by consumer (10%) Energy from total lost when consumed (90%) First Primary producer 52 N/A N/A Second ...
*December 9, 2008*

**sci/275**

Identify the fruit or vegetable you selected and relate the second law of thermodynamics to the changes in energy observed in Appendix CHow did the amount of energy gained compare to the amount of energy lost as heat at the second through fourth trophic levels? Considering the...
*December 9, 2008*

**literature**

trust me i got a 85% which is a disappointment so if you want a 100% take this down 1.B 2.B 3.B 4.B 5.D 6.C 7.A 8.D 9.C 10.C 11.D 12.C 13.A 14.A 15.C 16.A 17.C 18.D 19.A 20.A
*December 9, 2008*

**math**

Ms. Jordan has been given a loan of $2,500 for 1 year. If the interest charged is $275, what is the interest rate on the loan?
*December 9, 2008*

**english**

need some help!which language learning strategies are you using when you need to solve these tasks: 1.Rewrite the sentences using adverbs I'm a terrible dancer.I dance_______ 2.Read the text and make questions and 3.Make subject and object questions So which language ...
*December 7, 2008*

**english**

yes, i will be teaching ESL classes.I'll look through this page and see what is says.:)
*December 7, 2008*

**english**

Hey everybody:) Question:How can I as a future teacher help my students to practice how to use language?
*December 7, 2008*

**deutsch**

Hallo!Versteht hier jemand deutsch?Ich muss einen Bericht schreiben.Muss ein Thema sein das etwas mit Kroatien zu tun hat.Eher was aktuelles.Wenn jemand mir Hilfe leisten kann könnte dann wäre ich sehr dankbar!
*December 1, 2008*

**government**

are third party efforts essentially a waste of time in America? who were the 4 greatest presidents and why? (did anyone know the site or where i could find the answer for this???)
*November 28, 2008*

**Niagara Falls**

So you mean the characteristics of Niagara Falls???
*November 26, 2008*

**Niagara Falls**

Well, I'm doing a project that I picked in science and one of the questions said "What are the physical features of Niagara Falls" and I don't know what that means, so please help me!!!
*November 26, 2008*

**health**

Well, you could say that how he's gonna ruin the family or what's going to happen if he drinks a lot.
*November 26, 2008*

**HS Calculus**

I have one more that I really am lost at. Question - find the points on the graph y=2x^3-3x^2-12x+20 at which the tangent is parallel to tthe x-axis. I do not even know where to begin. We were told we could use the shortcut for this one.! Thanks again
*November 25, 2008*

**HS Calculus**

Thank you . I think that I understand alittle better. It is oblivious that I do not understand this material.
*November 25, 2008*

**HS Calculus**

Definition of the derivative to calculate f'(x) if f(x) = square root 2x. Find the equation of the tangent & normal line to the graph of f at x=2. Tangent line - y=2x-x Normal line - y = 1/2x +3 I do not know whether these are the correct answers.
*November 25, 2008*

**HS Calculus**

Let f(x) = 2/3-x a) find the slope of the tangent to the graph of f at a general point x0 using the definition of the dervative. b) use the result in part a to find the slope of the tangent at x0=1. I am very confused. My answer for (a) 1/ 6-6x-x^2 (b) -1 I compared them to a ...
*November 25, 2008*

**Calculus**

what is the limit of x/(ln x) as x approaches 0?
*November 8, 2008*

**math**

235 x 0.3 = x 235 - x = the amount you have to pay
*November 6, 2008*

**HS Calculus**

1) Limit theta approaching zero sin squared theta/ tan theta 2) Lim x appraoches zero x + sin x/x x + sin x/x = x/x + sinx/x 0 + 1 =1 My answer : 1 Is this correct
*November 3, 2008*

**HS Calculus**

Help Have some more that I do not understand. Limit theta approaching zero SinTheta minus Tan theta/ sin cubed theta
*November 3, 2008*

**HS Calculus**

1) Limit theta approaching zero sin squared theta/ tan theta 2) Lim x appraoches zero x + sin x/x x + sin x/x = x/x + sinx/x 0 + 1 =1 My answer : 1 Is this correct
*November 3, 2008*

**HS Calculus**

Have some more that I do not understand. Limit theta approaching zero SinTheta minus Tan theta/ sin cubed theta
*November 3, 2008*

**Calculus**

Evaluate: Limit - Theta approaches 0 Theta /cos theta
*November 2, 2008*

**science**

What is the lock and key theory? Explain. I need to use words such as active site, substrate and catalyst Are there any diagrams of it?
*November 2, 2008*

**HS Calculus**

Sorry I posted the incorrect ? Evaluate: Theta approached zero Theta/cos theta
*November 2, 2008*

**HS Calculus**

Evaluate..........Please Help Lim Infinite -> 0 Infinite/cos infinite
*November 2, 2008*

**Math**

27 IS THE MODE WHICH IS THE # USED MOST. THERE ARE (2) OF THE FOLLOWING #'S: 20, 27, 36. IF THE MODE IS THE MOST USED #, THEN THERE SHOULD BE (3) 27. FIRST BLANK SPACE IS 27. RANGE IS THE DIFFERENCE BETWEEN THE 1ST # AND THE LAST #. FIRST # BEING 18 AND THE RANGE IS 22 SO ...
*October 27, 2008*

**calculus**

Help - I have three problems that I am stuck on - 1. Lim x approaches infinity (x-3/x squared + 4) 2. Lim x approaches 3 x cubed - x squared - 7 x +3/ x squared - 9 3. Lim x approaches negative infinity (x + square root x squared + 2x)
*October 27, 2008*

**calculus HS**

Analtical method to evaluate Lim X -> -infinite
*October 26, 2008*

**AP English Comp**

Same type of ?- Using - Notes of a Native Son by Baldwin 3. Baldwin uses many different writing techniques in the essay. Find instances of concrete description, action, reflection, and strong argumentative assertions. How do these techniques further his specific purposes.
*October 26, 2008*

**AP English Comp**

Help - Baldwin's - Notes of a Native Son - 1. What are the time periods of the essay? Baldwin does not present them chronologically; how does he connect them?
*October 26, 2008*

**Social Studies**

How did the Cherokee use the land to get food?
*October 22, 2008*

**Philosophy**

Appendix F Philosophy and Belief in God Matching Ativity
*October 20, 2008*

**college level physics**

a 40 kg skier skis down a frictionless slope angled at 10 degrees to the horizontal. Assume the skier moves in the negative direction of an x axis along the slope. A wind force with component Fx acts on the skier. What is Fx is the magnitude of the skier's velocity is (a) ...
*October 19, 2008*

**Math**

Soybean meal is 12% protein, cornmeal is 6% protein. How many pounds of each should be mixed together in order to get a 240-lb mixture that is 10% protein?
*October 19, 2008*

**Math**

Solve the following system of equations. x+2y=9 (1) x=3-2y (2)
*October 19, 2008*

**NOT SURE**

can i have some facts on Barack Obama and John MaCain please
*October 17, 2008*

**Science**

Could you please explain "total internal reflection" in simple terms (suitable for a 12/13 yr old.
*October 14, 2008*

**Science**

What in total internal reflection? (diagram please)
*October 13, 2008*

**12th grade Physics**

In an experiment, a car taveling at 88m/s,west slams into a wall and comes to a halt in 0.75 seconds. What is the car's acceleration vector?
*October 7, 2008*

**chemistry**

Consider a sample containing 2.00 mol of a monatomic ideal gas that undergoes the following changes from State A to State D: State A PA=10.5atm, VA=10.00L State B PB=10.5atm, VB=5.00L State C PC=24.5atm, VC=5.00L State D PD=24.5atm, VD=22.00L Assume that the external pressure ...
*October 4, 2008*

**business**

I know they are allowed to make a profit but at the same time a place like Singapore is capitalist and pays very little tax. I assume that both choices are somewhat correct. but it's a multiple choice question and i can only choose one so i dont know which one fits more
*October 3, 2008*

**business**

which one of these are true? In a capitalist economy: a) one might a profit b) one would pay no taxes
*October 3, 2008*

**TLC error**

When a TLC plate was developed, the solvent front ren off the top of the plate. why?
*September 30, 2008*

**History**

What should never be compromised?
*September 3, 2008*

**high school algebra**

The weather during Smedley's vacation was strange -- It was cloudy on 13 different days but it was never cloudy for an entire day -- Cloudy mornings were followed by clear afternoons -- Cloudy afternoons were proceded by clear mornings ---There were 11 clear mornings and ...
*August 28, 2008*

**Math**

The weather during Smedley's vacation was strange -- It was cloudy on 13 different days but it was never cloudy for an entire day -- Cloudy mornings were followed by clear afternoons -- Cloudy afternoons were proceded by clear mornings ---There were 11 clear mornings and ...
*August 28, 2008*