# Posts by sarah

Total # Posts: 5,982

Calc
If y=tanu, u=v-(1/v), and v=lnx. What is the value of dy/dx at x=e?

Calc
If x=t^3-t and y=?(3t+1), then dy/dx at t=1 is what?

Calc
If f(x)=6x^3-4x then d/dx(f(lnx)) would be what equation?

Calc
The tangent line to the graph of y=f(x) at both x=3 and x=4 is y=-x+5. Which of the following statements must be true? The function f(x) is the line y=-x+5 f(3)=f(4) f'(3)=f'(4) f(x) is not differentiable at x=3 and x=4 None of the above

Chemistry
What size volumetric flask do you need to dilute a 0.150M NaOH to 0.390M if you pipette 1500ml?

science
In The Darkest Part Of The Mansion, Where The Winds Are Set To High, A Man Fears His Presents, Where The Cotton Lies, Where Am I?

history
Am I right or am I right?

history
Okay so your wasting so much time, go to another website and actually read. I am not a hater, so do not be mad * no hard feelings * but you should still try to learn something instead of cheating off of everyone else.

Chemistry
In Cl2 + 2KBr -> 2KCl and Br2 produce that brown yellow effect?

Physics
You are given five identical resistors each of resistance r. How can you arrange all these resistors (in series, in parallel, or both) in order to have an equivalent resistance of 7r/2, 7r/3 or 2r

Statistics
The heights of women in a certain population have a Normal distribution with mean 64 inches and standard deviation 3.5 inches. We select three women at random from this population. Assume that their heights are independent. Find the probability that the tallest of these three ...

Dr.Bob Chemistry
Is HOET associated with E1 or E2? I think it is E2.

Chemistry
Sample A: Solid appearance:crystals, solids, white Solid Conductivity:no Solubility: soluble Solution appearance:substance disappears slowly Solution Conductivity: yes Relative melting point:2nd Sample B: Solid appearance:brown, tiny solids, dirt appearance Solid Conductivity...

Chemistry
When you try to leave your room you learn that the only door out is locked. Assuming there is no air flow into the room (air tight with no ventilation system) how long can you survive in the room (5 meters long, 5 meters wide, 5 meters high) -Human tidal volume (volume of air ...

urgent math
That's what is difficult for me. I have trouble drawing the diagram. Otherwise I know how to solve these problems. I need help drawing diagrams of these word problems. Is there a way you can possibly teach me how to draw diagrams?

urgent math
Paul is standing on a 39 m high building. The angle of elevation to the top of a taller building is 47 degrees and the angle of depression to the bottom of the same building is 36 degrees. What is the height of the taller building to the nearest tenth.

French
Can someone who is fluent in french look over this and make sure it makes sense? Ma maison de rêve est à Paris. Il a le sous-sol, le rez-de-chaussée, et le premier étage. Il a la cuisine, la salle à manger, la salle de séjour, trois la ...

English
Choose the meaning of the bolded vocabulary word in each passage in the next six questions. I can't bold them so the word will be in caps. Check my answers * = My answer 1. "Once, the listener fancied that he could DISTINGUISH the accent of town's people of his ...

Math
Consider sequence Uvn=2x^2. Find (?u)vn and write u as an accumalation sequence

Calc
How do I find the indefinite integral of: sec(y)(tan(y) - sec(y)) dy

Science
D, does anyone here go to NCCA?

Chemistry-Dr.Bob
The specific rotation of pure enantiomer is known from the literature to be -20. The measured value of a solution containing A plus its enantiomer B (specific rotation must be +20) is -40. What is the ee (enantiomer excess) of this sample?

Chemistry
The specific rotation of pure enantiomer is known from the literature to be -20. The measured value of a solution containing A plus its enantiomer B (specific rotation must be +20) is -40. What is the ee (enantiomer excess) of this sample?

math
75,74,72,69,65.What is the pattern.

Maths
Theo had two-thirds of a box of chocolates left. He and his two sisters share the chocolate equally.What fraction of the whole box does each of them have? If the box had 54 chocolates , how many chocolate dose each person eat?

oceanography
14C has a half-life of 5,730 years. If we start with 70 grams of 14C at time zero how many grams of14C will be left after three half-lives?_________

oceanography
One (1) kilogram of seawater (35‰) contains __ grams of dissolved salts and grams of water?

Calculus (AC)
Steve, you've been an amazing help. Thank you so much. This is the last question I need checked. Solve ∜82 using differentials. I got 3.00926

The measurement of the radius of a circle is 16 inches, with a possible error of .25 inches. (Use differentials to approximate the possible propagated error and the percent error. Propagated error= 1.6% Percent error= 4.6%

algebra
You are buying two kinds of notebooks for school. A three-ring notebook costs \$6, and a spiral notebook costs \$3. You must have at least five notebooks. The cost of the notebooks can be no more than \$24. Which system of inequalities, along x>0 and y>0 would you use to ...

Math
In a basketball game, Albert made 11 out of 15 free throws and Jake made 10 out of 13 free throws. Who had the greater ratio of free throws attempted? Explain your reasoning.

physics
How many joules of energy are required to heat 2 L of water from 25 C to 100 C? I looked up that the specific heat is 4200 J/kgK and i keep getting Q to equal 630000 but my homework website says that's wrong.

Math
Mary bought a scarf for five dollar spent Half of the remaining money on jogging shoes bought lunch for two dollars and then spent half of her remaining dollars on a DVD she had \$10 left how much money does she start with?

Math
Mary bought a scarf for five dollar spent one and a half of her remaining money on jogging shoes bought lunch for two dollars and then spent half of her remaining money on a DVD she had \$10 left how much money does she start with?

maths
annie bakes some cupcakes for her children. If she gives each child 8 cupcakes,she will have 2 cupcakes left.If she gives each child 9 cupcakes, she will need another 2 cupcakes. How many children does annie have? 8-2= 6 6 divide 2= 3 9-2= 8 8 x 3= 24 24 children.

maths fraction
1/2 of the pupils in a class are girls. 3/8 of the girls and 1/4 of the boys wear spectacles. what fraction of the pupils wear spectacles? 3/8 + 1/4 = 3/8 + 2/8= 5/8

Math
I have a question Me and a friend are doing our math homework and ran into a conflict What would be the product of 8-1x0+2/2 I say it would be 5 and my friend here says it would be 1 I did 1x0=0 8+2=10 10/2=5 Thanks

chemistry
draw the skeletal structure line-angle (line-bond) mode of 2-isopropyltoluene. Identify the number of hydrogen atoms bound to each carbon in the structure.

History

History
What was the original purpose of the Bill of Rights? A) to give the people their natural rights B) to restrict the power of the national government C) to restrict the power of the national and state governments D) to give power to the national government I believe the answer ...

History
Omg Hannah is correct I got 100%

American Government
The correct answer was B. :)

American Government
American foreign aid might be used to support which of the following foreign policy? A) Deterrence B) Containment C) Collective Security D) Isolationism My guess is B or possibly C? Definitely not A or D.

American Government
Yes, I completely agree. I notified my teacher about the questions error so hopefully it'll be fixed soon. However, until then, I thought I'd state was the correct answer was (even though it was technically wrong) for other students who may go to my school. :)

American Government

American Government
Sadly, my teacher is absent until the 10th. Thank you for your help anyway. :) Hopefully someone whose completed this lesson before will be able to help.

American Government
Who counts the Electoral College vote? A) House of Representatives B) Senate C) State legislatures D) Supreme Court My textbook says "The president of the Senate opens the electoral votes from each State and counts them before a joint session of Congress." I assume ...

PROBABILITY MATH HELP!!!!! DICE
A die is rolled. Find the probability of the given event. The number showing is an even number; The probability is :

Sets & Probability math Help please
A group of people were asked if they had run a red light in the last year. 206 responded "yes", and 184 responded "no". Find the probability that if a person is chosen at random, they have run a red light in the last year.

PROBABILITY MATH HELP!!!!!
Is letter c a 3?

PROBABILITY MATH HELP!!!!!
A die is rolled. Find the probability of the given event. (a) The number showing is a 5; The probability is? (b) The number showing is an even number; The probability is ? (c) The number showing is greater than 5; The probability is?

Trig
Cosine theta=8/17 and 270 degrees is < theta, and theta is< 360

History

History
Based on Common sense and the crisis what conclusion can be made about Thomas Paine? A : Thomas Paine accepted blame for causing the war B: Thomas Paine believed that colonist should remain loyal to the king C : Thomas Paine used his writing to persuade and inspire others. D...

Physics
We have a charge q = -0.6 x 10^-6 C at origin. And a vector r = (4 m, 3 m, 0 m). Find the electric field E(r) as a vector expressed in terms of i j and k. What is the distance in this case? Magnitude of r? Also, how do I find the Electric field as a vector? I'm stuck..

math
how do I order these from least to greatest: 1/2, -0.75, 0.6, -1/2

Chemistry
Aqueous solutions of copper (II) sulfate, CuSO4, and potassium carbonate, K2CO3, a blue parcipitate of copper (II) carbonate forms in addition to one other compound. We have to write the balanced chemical equation for that but our teacher didn't teach us anything about that

Math , trigonometry
From a point on the ground 20m from the base of a tree the angle of the elevation to the top of the tree is 47 degrees. Calculate the height the of the tree correct to the nearest metre ???

bio
1. Complete the following conversions: 1ul= what mal I thought 1000 100ul = what ml 50ml = what ml ul=1.5 ul=0.06ml ul=0.003ml idk how to do this was not in lab

Math
Solve for x 4(log(x)+5)=6

Math
Solve for p 93=12(2)^p

chem
If you were asked to convert 25 cg to the unit hg, which of the following would be the first fraction used in the conversion? 1 hg/10^2 10^2/1hg 10^2 hg/ 1cg 10^-2 g/1 cg

calculus and chemistry
Thank you so much I realized I was missing the -5 at the end

calculus and chemistry
A container of hot liquid is placed in a freezer that is kept at a constant temperature of 10°F. The initial temperature of the liquid is 160°F. After 5 minutes, the liquid's temperature is 60°F. How much longer will it take for its temperature to decrease to ...

calculus
A container of hot liquid is placed in a freezer that is kept at a constant temperature of 10°F. The initial temperature of the liquid is 160°F. After 5 minutes, the liquid's temperature is 60°F. How much longer will it take for its temperature to decrease to ...

English
How do i correct this? She wants pink and gray curtains in her bedroom I believe blue and white would be prettier.

English
Is this correct? Carol couldn't start the car after leaving the football game. Fortunately, however, Roger came along and spotted the trouble quickly.

FRENCH
MERCI MmeJMcGin!

FRENCH (:
Did I word the wordings right and is #3 & #4 in its right simple future and is #5 is in its proper conditional form? I'd appreciate the help!

FRENCH
1. Quel travail voulez-vous? (What job do you want?) - Je veux être un pédiatre . 2. Quel type d'education avez-vous recu? (What kind of education have you received? - I got my M.D in med school and finished pediatric residency. J'ai obtenu mon M.D à...

American Government
Where can the strengths of the Articles of Confederation be seen in the Constitution? A) The constitution allows states the ability to control most of their own affairs. B) The constitution allows states the power to tax citizens. C) the constitution allows states the ability ...

algebra
How do you write 4.2 x 10 to the 5th power in standard form?

Algebra
Use the properties of exponents to simplify the following expression. Write the answer in scientific notation. (5.6x10^5) (9.9x10^-8) divided by (8.4x10^-4) (5x10^6) =28.9x10^-1 I added 5.6 9.9 8.4 5 5+-8+-4+6+ -1

Algebra
would my answer be 6,761,*10^6 or 6,761,*10^7 both saying its wrong

Algebra
Write the number in scientific notation. 6,761,000 I said it was 6,761,*10^3 Its saying its wrong?

Algebra
so the answer would be 630,*10^9? or 630,*10^8 becuase 6.2x 10^8 it is saying its wrong.

Algebra
If you are 20 years old,you have been alive for more than 630,000 seconds,write the last number in scientific notation? 630,000,000 I said it was 630,*10^7 idk how its wrong!

Algebra
(9x10^8)(3x10^3) what I did was 9 times 3 got 27x. Then did 8+3=11. Put it all together and got 27x10^11. Its saying it is wrong though

Algebra
A light year, the distance light travels in 1 year, is approximately 5.9×10^12 miles.A nearby galaxy is approximately 1.2×10^7 light years from our galaxy. Find the distance in miles between our galaxy and the nearby galaxy. IDK this question. I first thought you ...

Algebra
Write the following number in scientific notation. 0.157 I thought the answe was 0.157x10^3. it is wrong need help! No idea how its wrong

Algebra
Write the following number in scientific notation. 50,800 I thought the answer was 50.8x10^4 Need help

Homework
I will call you when I will get back from visiting my sister. will/get back/visiting find a incorrect answer? will is incorrect here?

Algebra
Steve I watched a example with one that had nothing in front. So it threw me off because I tried to follow that example and steps. Thank you for your help

Algebra
5-2 [5(-2)+4(2)/ -3(3)+3(-4)] my work : I did 5(-2) + 4(2) and -10 +8 then the bottom _9 (-12) = -2/-24 I need major help! Don't know what to do with 5-2 even.

Algebra
2^-1+4^-5 I thought 5/8 but its wrong. help please

Algebra
(2x^-2y^6)^4 / (4x^3y^-4)^2 = I got 16x^14/y^16 The computer is saying it's wrong and I don't get it. Even watched a video on similar problem. Help me!

Algebra
(x^-2)^3 (x^2)^4 on the bottom its x^15 I did this to get my answer (x)^-6 (x)^-8 /x^15 got x^-4 / x^15= x-14-(15)= -29 final answer is x^-29 IDK what I did wrong the computer saying its wrong! Help pleas

Math
The population of a town in 1920 was 3500 people. The town's population decreased linearly, and in 1927 the population was 3185. Find a formula for P, the town's population, in terms of t, the number of years since 1920.

Math
The following equation relates u and t. 3t=(1)/(7+u) Solve for u as an explicit function of t.

English
Is this sentence complete Swimming in the heated water of an indoor pool was a new experience for Elizabeth.

English
I think the answer is "Yes, I think that those big gas guzzlers are a threat to the ecology, don't you?" My friend thinks its without quotations Yes, I think that those big gas guzzlers are a threat to the ecology, don't you?

English
I think the answer is "Jackie, please see whether the postman has oh there he is now." But my friend thinks its this way "Jackie, please see whether the postman has, oh! There he is now."

Algebra
what is the perimeter of the figure if the length is 15/6in and bottom is 15/6 in what would it be. I thought you do 15+ 15+15+15 and divided by 4. you get 60/4 and then final answer would be 15

Algebra Word promblems
Alba Tross had an annual salary of \$50,000. She received a 5 percent pay cut one year followed by a 5 percent pay raise the next. a. What is Alba’s final salary? Would it be 50,000 - 5% + 5% =49.875 b. What is Alba’s final salary less than her original salary? Not ...

Fractions
5+ 2/5 would the answer be 5/1+ 2/5 = 5/1 times 5/5 +2/5= 25/5 + 2/5 = 27/5

Fractions
would the answer be 32/3? Not sure

Fractions
4/3 divided by 1/8

Algebra
A family decides that they can spend 3/5 of their monthly income on house payments if their monthly income is \$1,500 how much can they spend for house payments?

Fractions
would the answer be 42/40 but then simplify it to 21/20?

Fractions
Find the area of the triangle with base 7/8 and height 6/5