Wednesday

December 7, 2016
Total # Posts: 368

**History**

Would someone please give some reputable sources for history of smallpox in Europe and China. I am writing a paper on it. My thesis is There are similarities in the devastation, experts and vaccination in the regions of both China and Europe as it relates to the history of ...

*December 3, 2016*

**Math**

600,000. = _ ten thousands

*November 16, 2016*

**physics**

a 1240 kg automobile stops in a distance of 41m. if initial velocity was 22.5m/s, what force did the road exert on the car to stop it? Answer pls... Thank You

*October 9, 2016*

**physics**

A 350N box is pulled along a horizontal pathway by a rope which makes an angle of 42degrees with the pathway. If a force of 250N is applied on the rope, what is the coefficient of sliding friction?

*October 9, 2016*

**physics**

Aljhumar is trying to arrange his room. He pushes an 80kg cabinet across the wooden room which resists the motion with a 300N force of friction. What is the coefficient of sliding friction between the cabinet and the floor?

*October 9, 2016*

**physics**

The coefficient of sliding friction between a 10kg rubber tire and wet concrete road is 0.43. Determine the time in which a moving object with a velocity of 35mi/h can come to a stop on the road. What distance is covered at this time?

*October 9, 2016*

**physics**

A 2.2kg bowling ball with a velocity of 2m/s rolls along a level floor for 30m before coming to a halt. What is the coefficient of rolling friction?

*October 9, 2016*

**physics**

How to get acceleration? and time?

*October 8, 2016*

**math (stats)**

Enter your answers as decimals or fractions, rather than percents. In a family with 7 children what is the probability of having 4 boys and then 3 girls, in that order? (Exclude multiple births and assume all outcomes are equally likely). Preview In a family with 7 children, ...

*October 2, 2016*

**math (stats)**

According to Masterfoods, the company that manufactures M&M’s, 12% of peanut M&M’s are brown, 15% are yellow, 12% are red, 23% are blue, 23% are orange and 15% are green. [Round your answers to three decimal places, for example: 0.123] Compute the probability that a ...

*October 2, 2016*

**English**

what are the answers?

*May 2, 2016*

**Chemistry**

How many grams of MgCl2 would be required to make 440 g of magnesium ? The other product is chlorine.

*April 26, 2016*

**European History, Modern History**

"Provide a thorough explanation of Hungary's impact on the communist bloc politically, and compare Hungary's situation to that of other Warsaw Pact members." I've decided to use the Revolution of 1956 and Goulash Communism as my examples, but I'm not ...

*April 13, 2016*

**Physics- Optics**

A double lens system is made of +35.0 cm lens (lens #1) and a - 26.0 cm lens (lens #2). Lens #1 is placed at x = 0 cm on a meter stick and lens #2 is placed at x = 30.0 cm. Where on the meter stick will the final image be formed when looking at a distant object? s2"=f2(f1...

*April 5, 2016*

**Physics-Lens**

The focal length of your camera lens is 70mm. It is used for taking pictures of your friend who is 1.5m tall. What is your friends distance from the lens if the image just fills the 24mm vertical dimension of the film? I tried M=hi/ho=.16 .16=di-f/f di=-68.88

*April 5, 2016*

**Physics**

Blue light (λ vac= 440 nm) shines onto a puddle of water (n water = 1.33). There is a thin layer of oil (n = 1.47) on top of this water. What is the minimum thickness of the oil if there is constructive interference for the light? I tried 2t=(m+ 1/4)λ/noil but it ...

*April 5, 2016*

**math **

a to the 3rd power divided by a to the 5th power?

*February 15, 2016*

**math-story prob**

Quinn is selling raffle tickets. The Ultra tickets cost $3 and the deluxe tickets cost $2. Quinn sold 89 tickets for $235. How many of each ticket did Quinn sell?

*February 15, 2016*

**math **

Need help to simply: 3x+2y=-18 -2x+5y=-26 Please help. Thanks

*February 8, 2016*

**math**

need to simply: 3x+2y=-18 -2x+5y=-26 Please help

*February 8, 2016*

**Math**

Please help: Jaylee wants to have a mural for her room. She has two bids: #1 Artist charges an initial fee of $79.50, plus $1 sq ft. Artist #2 does not charge a initial fee and charges $2.50 sq ft. Which size of mural(in sq ft) will be the same cost when painted by either artist?

*February 1, 2016*

**math-story prob**

Please help: Jaylee wants to have a mural for her room. She has two bids: #1 Artist charges an initial fee of $79.50, plus $1 sq ft. Artist #2 does not charge a initial fee and charges $2.50 sq ft. Which size of mural(in sq ft) will be the same cost when painted by either artist?

*February 1, 2016*

**math-story prob**

The total cost of gift baskets include the cost of each basket and a one time delivery fee. The cost of the basket is the same regardless of how many the customers orders. One company bought 40 baskets for a total of $715 and another company bought 400 baskets for $5,935. What...

*January 25, 2016*

**math-story prob**

Please help: The total cost of gift baskets include the cost of each basket and a one time delivery fee. One company bought 40 baskets for a total of $715 and another company bought 400 baskets for $5,935. What is the cost per basket? What is the cost for the one-time delivery...

*January 25, 2016*

**math-linear equations**

Its a story problem: The flying W Ranch raises only cows and horses. There are total 340 animals. The owner prefers horses to cows, so he has 52 more horses than cows. a. Write two different linear equations to model this situation. b. Solve the system of linear equations ...

*January 19, 2016*

**Math**

Please help me: I need an equation in slope intercept form when I know these values(-6,1) (-3,2). Do I have to do another equation first?

*January 10, 2016*

**math**

need an equation in slope intercept form when I know (-6,1) (-3,2)

*January 10, 2016*

**algebra**

School play tickets are $5.00 for none students and $3.00 for students. 937 ticket were sold for $3943.00 How many student tickets were sold and how many none student tickets were sold ?

*December 13, 2015*

**English**

1. Being educated meant that slaves might question their existence and try to escape. 2.Reading made him understand his situation and thinking about it torments him 3. All of the above. 4. The Declaration of Independence

*December 10, 2015*

**chemistry**

how many joules are needed to completely melt 25 grams of ice at 0 degree celcius?

*December 6, 2015*

**English**

Thank you so much

*October 28, 2015*

**English**

Waverlys mother.. She is interacting with... I have to write a quick write but I don't understand it

*October 28, 2015*

**English**

I believe Amy tan

*October 28, 2015*

**English**

How does the interaction between waverly develop over the course of the passage "rules of the game."

*October 28, 2015*

**physics**

-.71

*September 27, 2015*

**Algebraj**

jbh

*September 15, 2015*

**chem**

If you maximize the unshared electrons in the boron atom, the electron configuration is? i know the electron configuration at ground state is 1S2 2S2 2P1 but when it maximizes unshared electrons i don't understand how it affects the configuration

*August 24, 2015*

**Biology**

What main region(s) of a peptide would be the major effectors of peptide folding?

*August 24, 2015*

**Math grade 11 u**

the answer to c) and d)

*July 22, 2015*

**Math grade 11 u**

HAHA I need help with that too and i think we are in the same class (*CCH right) PS. posted if you know the answer

*July 22, 2015*

**Chemistry**

Calculate the volume of solution that has a vapour pressure of 31.27 mbar and contains 84.3g of sucrose, at a temperature of 25.0C. The vapour pressure of pure water at 25.0C is 31.7mbar, the density of water is 1.00g/mL, and assume no change in volume occurs upon dissolution.

*July 3, 2015*

**Chemistry**

A 1.50 L buffer solution is 0.250 mol L-1 in HF and 0.250 mol L-1 in NaF. Calculate the pH of the solution after the addition of 0.0500 moles of solid NaOH. Assume no volume change upon the addition of the base. The Ka for HF is 3.5 × 10-4. Thanks in advance!

*June 21, 2015*

**Chemistry**

So what is the answer?

*June 16, 2015*

**physics**

2.64 hours

*June 15, 2015*

**Chemistry**

1.3188g of antacid is weighed and mixed with 75.00mL of excess 0.1746M HCl. The excess acid required 27.20mL of 0.09767M of NaOH for back titration. Calculate the amount of CaCO3 in the tablet.

*June 8, 2015*

**algebra**

-2(x-3) 6x Is that the right answer?

*May 25, 2015*

**Algebra**

For the equation 9x^2+4y^2+54x-8y+49=0 determine the center, vertices and foci?

*May 4, 2015*

**Algebra**

Renee is twice as old as Dana. Four years ago Renee was three times as old as Dana. How old are Renee and Dana now? Show Work

*April 27, 2015*

**physics**

52.31

*April 15, 2015*

**chemistry**

269 mL of a 0.2089 M sodium carbonate (Na2CO3) solution is prepared and labelled "Solution A".

*March 22, 2015*

**physics**

You have an RC circuit and you measure the "zero" voltage to actually be 2.385 [Volts]. The peak voltage is measured to be 8.262 [Volts]. At what voltage value will you look for t4 = time stamp for 15/16 total charge?

*March 18, 2015*

**Physics **

1. Given t1/2 to be 0.0137 seconds, how long should it take to reach 87.5% of maximum charge?

*March 10, 2015*

**Physics help please!**

1. Given t1/2 to be 0.0137 seconds, how long should it take to reach 87.5% of maximum charge? 2. Let's say you measure t1/2 to be 0.0137 seconds and the resistance in the circuit is 99 Ohms. Then what is the capacitance in micro Farads? 3.q = qmax(1 - e -t / τ) Using ...

*March 10, 2015*

**Civics**

roi soleil

*March 10, 2015*

**Art**

Mrs.Sue you need to chill😂

*March 2, 2015*

**Math**

2+2=? Help?

*February 24, 2015*

**English**

I wish I read the book so I could help you...

*February 23, 2015*

**math**

35cm by 25cm lol

*February 23, 2015*

**math**

multiply each measurement by 2.5

*February 23, 2015*

**3rd grade math**

@DrBob Do 3rd graders know algebra?

*February 23, 2015*

**Science**

Describe the flow of blood in the human body, including through each of the four chambers of the heart. Explain how the blood changes as it moves through various locations in the body.

*February 11, 2015*

**problem**

Value Rent-A-Car rental a luxury car at a daily rate of $42.15 plus 50 cents per mile. A business person is allotted $130 for car rental each day. How many miles can the business person travel on the $130?

*February 8, 2015*

**English**

bbcadef

*January 26, 2015*

**business**

C. Manager B is incorrect in projecting an increased focus on competitive advantage.

*December 5, 2014*

**MATH**

A. using Ti-84 calculater: go STAT then edit ,type the data in L1 ,then STAT again go to TESTS go to Tinterval then press ENTER. then press Calculate.then you've got your answers.Goodluck :)

*November 30, 2014*

**chemistry**

Determine how many milliliters of 0.310 M HClO4 will be required to neutralize 52.37g Ca(OH)2 according to the reaction: 2HClO4 + Ca(OH)2 ---> Ca(ClO4)2 + 2 H2O

*November 30, 2014*

**Geometry**

Conic sections: Ellipse Show that the distance between the directrix and center is D1C = a/e. F1V1 + F1V2 = eD1V1 + eD1V2 2a = e(D1V1 + D1V2) = e(D1V1 + [D1V1 + V1V2]) = e(D1V1 + V1V2 + V2D2) = e(D1V1 + V1C + + CV2 + V2D2) = e([D1V1 + V1C] + [CV2 + V2D2]) = e([D1C] + [CD2]) 2a...

*November 9, 2014*

**Algebra**

Belle is swimming in the lake and is 230 feet from shore. She starts to head back to shore at arate of 2ft/s. Ten seconds later, Max hops in a row boat and rows towards Belle at a rate of 5 ft/s. How many seconds will Bell have been swimming when Max reaches her?

*October 16, 2014*

**Algebra**

Please help I am lost on this one and another one i posted

*October 16, 2014*

**Algebra**

A car leaves Denver at 30 km/h traveling south. Two hours later, another car leaves Denver traveling south at 40 km/ h. How many hours had the first car been traveling when the second car catches up?

*October 16, 2014*

**Algebra**

The length of a rectangle is 3 times the width. If the length is increased by 4 cm and the width is decreased by 1cm the parimeter will be 102 cm. find the dimensions of the original rectangle. I don't know the equation, please show the work. Not just the answer. So I can ...

*October 16, 2014*

**math**

Four ways to determine a plane: 1) two parallel lines 2) two intersecting lines 3) three noncollinear points 4) a line and a point not on the line

*October 9, 2014*

**math factoring**

factor 2x^4+12x^3-18x^2-108x

*October 5, 2014*

**math**

Seventy-two and fifty-three thousandths

*September 29, 2014*

**chemistry**

If He(g) has an average kinetic energy of 7590 J/mol under certain conditions, what is the root mean square speed of F2(g) molecules under the same conditions?

*September 28, 2014*

**MATH**

How do i find the center of a circle using 3 points. Also need to find the radius and the equation of the circle.... My 3 points are (2,8) (-4,6) (1,-1) I found the Equation of the perpendicular bisector of the line between the first and second point which was y=(3/2)x + 5 And...

*September 25, 2014*

**Please Help! Math**

How to find the center and radius of a circle using 3 points... My 3 points are (2,8) (-4,6) (1,-1) I found the Equation of the perpendicular bisector of the line between the first and second point which was y=(3/2)x + 5 And the Equation of the perpendicular bisector of the ...

*September 25, 2014*

**business**

. You've written a check to Goodwill Supply, and the check has been lost. What should you do? A. Stop payment on the first check; then write a second one. B. Send a counter check to Goodwill. C. Write another check immediately. D. Call Goodwill and tell them you'll ...

*September 22, 2014*

**office**

Which of the following organizations would most likely use an unabridged dictionary? A. The English department at a large university B. An automotive dealership C. A large retail department store D. A pediatrics hospita

*September 19, 2014*

**Algebra help**

I know how to get the slope. In my answer key it has the solution of -1\3x +10/3 What i don't get is how they got the +10/3 part

*September 17, 2014*

**Algebra help**

Find an equation of the line L, where L is perpendicular to y=3x and passes through the point (1,3) Please help I'm not sure what formula to use or how to work out this problem

*September 17, 2014*

**Algebra**

Use a graphing utility to approximate the real solutions if any, of the given equation rounded to two decimal places. x^3-9x+1=0

*September 17, 2014*

**math**

Are the two solutions to x (2x+1) = 1 found by setting x = 1 and 2x + 1 = 1? Explain your reasoning. What are the solutions to this equation? Show how you arrived at your answer. Create an equation for your classmates to solve that requires factoring.

*July 3, 2014*

**aLGEBRA**

5/4X+7/12=1/3X-1/6

*May 14, 2014*

**math **

ABCD is a rectangle. If AC = 2(5a + 1) and BD = 2(a + 1), find the length of each diagonal.

*May 9, 2014*

**Precalculus**

.4067

*April 21, 2014*

**Chem.**

At equilibrium, the concentrations in this system were found to be [N2]=[O2]=0.200 M and [NO]=0.500 M. N2 + O2= 2NO If more NO is added, bringing its concentration to 0.800 M, what will the final concentration of NO be after equilibrium is re-established?

*April 1, 2014*

**English IV**

Help Please! Choose the function of the italicized infinitive phrase shown below. (stars indicate italicized infinitive phrase) Meridith is *to be restored as captain.* Answer Options: Function of infinitive: Adjective, Adverb, or Noun. (I chose adverb & got it wrong)

*February 20, 2014*

**Chemistry:Important!!!!!!!**

Thank you! I was just missing the step of multiplying by atomic mass! :)

*February 10, 2014*

**Chemistry:Important!!!!!!!**

A student begins with 9.7 mL of a 0.26 M Cu(NO3)2 solution and performs copper cycle lab. She recovers 0.075 grams of copper metal. A) What is the Theoretical Yield B) What is the Actual Yield C) What is the Percent Yield

*February 10, 2014*

**physics**

1600 seconds

*January 27, 2014*

**office finances**

the answer is B. stub

*December 28, 2013*

**Social Studies**

idk pls help

*December 23, 2013*

**engineering**

No idea. But i want to know. Does anyone have an idea??

*December 19, 2013*

**Finance**

The spot exchange rate for the Canadian dollar is Can $1.14 and the six-month forward rate is Can $1.17. Calculate whether a U.S. dollar or a Canadian dollar is worth more.

*December 17, 2013*

**chemistry **

Q2: A sample of carbon dioxide(CO2) has a mass of 55g and occupies 3.3L at 100C. What pressure does the gas exert (in kPa)?

*December 8, 2013*

**chemistry **

Q3: In the combustion reaction of 149g of propane(C3H8) with excess oxygen, what volume of carbon dioxide(CO2) is produced at STP? (note: balance the reaction first) C3H8 + O2 3CO2 + H2O

*December 8, 2013*