Sunday
December 4, 2016

# Posts by B

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
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
February 8, 2016

math
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

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

the answer to c) and d)
July 22, 2015

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
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

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

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
February 23, 2015

math
35cm by 25cm lol
February 23, 2015

math
multiply each measurement by 2.5
February 23, 2015

@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
January 26, 2015

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
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

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

. 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

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
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

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