# Posts by Sarah

Total # Posts: 5,758

**Calculus algebra review**

((1/2+h) -(1/2)) / h found LCD of numerator ((2)-(2+h)/2(2+h))/h is it 1

*January 17, 2017*

**Physics**

ok i got it, thanks. 4.10*10^5

*January 17, 2017*

**Physics**

An auditorium measures 43.0m × 18.0m × 15.0m. The density of air is 1.20 kg/m3. What is the volume of the room in cubic feet? (Do not input units. Note that 1m = 3.28ft) My Answer 43x18x15 = 11,610 m^3 11,610m3 * 3.28ft m = 38,080.8 ft When I used this number I got...

*January 17, 2017*

**math**

6. You are given a sheet of cardboard that is 8.0 in. x 11.0 in. How many full circles with a diameter of 3.0 inches can you cut from the cardboard? What is the percentage of waste if the

*January 17, 2017*

**social studies**

Thank you!

*January 14, 2017*

**social studies**

In America, citizens with voting rights can A. Make the laws. B. Vote for or against any law. C. Propose new laws. D. Vote for or against the officials who make the laws. <<<<< somebody please help me

*January 14, 2017*

**Stoichiometry **

Determine the mass % (m/m) of a NaCl solution if 58.5 grams of NaCl was dissolved in 50 ml of water (assume the density of water to be 1.0 g/ml).

*January 12, 2017*

**Mathematics**

F(x, y) represents a velocity field of a fluid over a surface S defined by z = 6 ? 3x ? 2y. If the magnitude of the velocity in the direction of the unit normal vector, n?, on S is 3z??14, compute the flux of F(x, y) over the surface S in the first octant oriented upward, ...

*December 24, 2016*

**Math**

a photocopier increase the sides of a square in a ratio of 5:4. what percentage has the size increased?

*December 16, 2016*

**English**

Either individuals chose to face their conflict, and fight for it in a positive manner. Or they can run away from their problems, and deal with them in a negative manner. Its MORE important for individuals to face their conflicts and fight for them. The way they choose to ...

*December 13, 2016*

**Chemistry**

Hi , I have this question and I do not know what steps to follow. Please help guide me. It will be really appreciated. Calculate the extent of oxidation in a stream where water it's in equilibrium with atmospheric oxygen and had a pH pic 6.5 (a(H3O+) =antilog (-6.5) ). The...

*December 10, 2016*

**Math**

Mr. Jones makes 3% commission on his sales of widgets. At a different company, Mr. Smith makes 5% commission selling the same widgets at the same price. Mr. Smith sold 500 fewer widgets than Mr. Jones, and they both earned the same commission. How many widgets ...

*December 9, 2016*

**Math**

If two pounds of meat will serve 5 people, how many pounds will be needed to serve 13 people?

*December 7, 2016*

**Math**

How do you find the constant rate of change?

*December 7, 2016*

**Math**

Under ideal? conditions, a population of rabbits has an exponential growth rate of 11.8?% per day. Consider an initial population of 300 rabbits. Find the exponential growth function.

*December 6, 2016*

**Chemistry**

Then if H+ equals antilog pH, M- would also be equal to H+ , so then what will I be solving for? Because H2M species is given Sorry if this is a stupid question, I really don't know Thanks you!!

*December 6, 2016*

**Chemistry**

Okay so my lecturer has this in our slides and there are no notes just a heading saying speaciation, I have tried google and everything I have read does not include pH in their question. Please help me Calculate the equilibrium concentrations of the different species in a 0....

*December 6, 2016*

**math**

Juan has three rain sticks measuring 8 inches, 6 inches, and 12 inches each. what is the least common multiple of 8, 6, and 12? A.12 B.24*** C.48 D.96 is it B?

*December 6, 2016*

**Calc**

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

*December 6, 2016*

**Calc**

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

*December 6, 2016*

**Calc**

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

*December 6, 2016*

**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

*December 6, 2016*

**Chemistry**

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

*November 29, 2016*

**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?

*November 27, 2016*

**Chemistry**

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

*November 27, 2016*

**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

*November 23, 2016*

**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 ...

*November 20, 2016*

**Dr.Bob Chemistry**

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

*November 19, 2016*

**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...

*November 16, 2016*

**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 ...

*November 13, 2016*

**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?

*November 12, 2016*

**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.

*November 12, 2016*

**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 ...

*November 3, 2016*

**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 ...

*November 3, 2016*

**Math**

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

*November 2, 2016*

**Calc**

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

*November 2, 2016*

**Science**

D, does anyone here go to NCCA?

*October 31, 2016*

**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?

*October 29, 2016*

**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?

*October 29, 2016*

**math**

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

*October 27, 2016*

**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?

*October 26, 2016*

**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?_________

*October 26, 2016*

**oceanography**

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

*October 26, 2016*

**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

*October 26, 2016*

**Calculus (answer check)**

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%

*October 26, 2016*

**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 ...

*October 25, 2016*

**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.

*October 23, 2016*

**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.

*October 19, 2016*

**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?

*October 16, 2016*

**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?

*October 16, 2016*

**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.

*October 16, 2016*

**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

*October 16, 2016*

**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

*October 15, 2016*

**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.

*October 13, 2016*

**History**

The answer was B!

*October 11, 2016*

**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 ...

*October 11, 2016*

**American Government**

The correct answer was B. :)

*October 5, 2016*

**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.

*October 5, 2016*

**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. :)

*October 4, 2016*

**American Government**

The correct answer was Senate.

*October 4, 2016*

**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.

*October 4, 2016*

**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 ...

*October 4, 2016*

**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 :

*September 30, 2016*

**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.

*September 30, 2016*

**PROBABILITY MATH HELP!!!!!**

Is letter c a 3?

*September 30, 2016*

**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?

*September 30, 2016*

**Trig**

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

*September 28, 2016*

**History**

My answer is C

*September 28, 2016*

**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...

*September 28, 2016*

**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..

*September 27, 2016*

**math**

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

*September 26, 2016*

**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

*September 24, 2016*

**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 ???

*September 23, 2016*

**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

*September 19, 2016*

**Math**

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

*September 19, 2016*

**Math**

Solve for p 93=12(2)^p

*September 19, 2016*

**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

*September 19, 2016*

**calculus and chemistry**

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

*September 18, 2016*

**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 ...

*September 18, 2016*

**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 ...

*September 17, 2016*

**English**

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

*September 15, 2016*

**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.

*September 15, 2016*

**FRENCH**

MERCI MmeJMcGin!

*September 15, 2016*

**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!

*September 15, 2016*

**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...

*September 15, 2016*

**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 ...

*September 14, 2016*

**algebra**

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

*September 12, 2016*

**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

*September 12, 2016*

**Algebra**

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

*September 12, 2016*

**Algebra**

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

*September 12, 2016*

**Algebra**

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

*September 12, 2016*

**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!

*September 12, 2016*

**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

*September 12, 2016*

**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 ...

*September 12, 2016*

**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

*September 12, 2016*

**Algebra**

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

*September 12, 2016*

**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?

*September 11, 2016*

**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

*September 10, 2016*

**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.

*September 10, 2016*

**Algebra**

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

*September 9, 2016*