Thursday
November 27, 2014

Posts by Lauren


Total # Posts: 1,544

Math
m=y2-y1/x2-x1 =(-3)-(-6)/1-(-5) =3/6 =1/2 y=mx+b y=1/2x+b now use either of the points to solve for b -3=1/2(1)+b -3-1/2=b 2.5=b so y=0.5x+2.5
May 2, 2010

math
The volume of a pyramid is V=1/3Bh where B is the area of the base and h the height from the base to the apex. This works for any location of the apex, provided that h is measured as the perpendicular distance from the plane which contains the base. so yes, this statement is ...
May 2, 2010

Math
Divide and Simplify: y^2-25/7 divided by 7y+35/49
May 2, 2010

Math
Divide and Simplify: y^2-25/7 divided by 7y+35/49
May 2, 2010

Math
Multiply and Simplify: Can you please show me the steps on how you get the answer. Thank You 2/4n+6 times n^2+2n-3/n+1
May 2, 2010

MATH
can someone explain how an quadratic equation with factoring and give an example,PLEASE!
May 1, 2010

MATH
can someone explain how an quadratic equation with factoring and give an example,PLEASE!
May 1, 2010

Food Chemistry
Calculate the amounts and pH values for preparing the following acetic acid/acetate buffer solution. 1.) In the first step, If you plan to prepare a 2.00 M sodium acetate in 200.0 mL distilled water, how many grams of sodium acetate should be added in water? 2.) B. In the 2nd ...
April 29, 2010

Physics
You meet a person with prescription glasses of +1.74 dpt. What is the near point of this person? Express the result as a positive number! Hint: the near point of a healthy person is 25 cm. An object placed at this distance will form an image at the near point of the person. i ...
April 28, 2010

physics
You meet a person with prescription glasses of +1.74 dpt. What is the near point of this person? Express the result as a positive number! Hint: the near point of a healthy person is 25 cm. An object placed at this distance will form an image at the near point of the person. 1....
April 27, 2010

physics
A light ray strikes a flat, L = 1.6 cm thick block (depth) of glass of refractive index 1.49 at an angle of 30 with the normal. Calculate the lateral shift of the light ray, d. there is a digram showing the light ray continuing at the same angle (30* to normal) until it exits ...
April 27, 2010

physics
Two parallel wires carry currents I1=100A and I2 (they run in the same direction). The top wire is held in position; the bottom wire is prevented from moving sideways but can slide up and down without friction. if the wires have a mass of 10g/meter of length, calculate I2 such...
April 24, 2010

Math
If spiner has 3 equal sections of yellow, blue and green and another has equal sections of yellow, blue, green and red and you spin both spinners at the same time what is the probabiliy of getting 2 colors that are the same?
April 22, 2010

Trigonometry
How do I find the value of sin(a-b) if tana=4/3, cotb=5/12, 0<a<90, and 0<b<90?
April 15, 2010

Math Analysis
Oh wow that is simple. Thank you so much for your help.
April 15, 2010

Math Analysis
How do I simpllify 1-sin^2x/1-cos^2x?
April 15, 2010

Math analysis
thank you for your help
April 15, 2010

Math analysis
How do I simplify cscx-cotxcosx?
April 15, 2010

math
Can you help me solve this solving quadratic equation.x^2-x-1=0
April 15, 2010

physics
A thin cylinder of copper has a mass m=50g and is 1 meter long. what is the minimum current that has to flow through the cylinder for it to levitate in a magnetic field of 0.1T. would i use B=uI/2pi(d) im confused about what d is and how the mass relates to this...
April 15, 2010

math check
Peform each indicated operation and simplify. Can you please check my answers. Thank you. A)(x^2+2x-3)+ (2x^2-x+1) Answer: 3x^2+x-2 B) (-x^3+2x^2-5)+(x^2-x+6) Answer:-x^3+3x^2-x+1 C) (3y^2-x+7)-(y^2-2x+3) Answer:4y^2-3x+10 D)(2x^2-xy+y^2)-(-3x^2+xy+y^2) Can you help me with ...
April 14, 2010

Math Check
Srry the problem for a is suppose to be 2x(x^2-3x+2) this is my answer 2x^3-6x^2+4x
April 14, 2010

Math Check
All the directions say for these three problems is multiply and simplify. Are my answers correct? Thank you A)(x^2+2x-3)+(2x^2-x+1) Answer: 2x^3-6x^2+4x B)(x+1)(2x-1) Answer: 3x-1 C)(x-2)(x^2+2x-3) Answer: x^3-7x+6
April 14, 2010

Physics
You often see birds resting on power lines that carry currents of 50A. the copper wire on which the bird stands has a radius of 1.1cm. assuming the birds feet are 4.0 cm apart, calculate the potential difference across its body... -------- V=IR R=pL/A I=50A L=4.0cm p=from ...
April 14, 2010

calculus
the limit from n->infinity of the summation of [2+(3/n)k]^2(3/n) when k=1
April 13, 2010

chemistry
a 500.0 g sample of h2o2 conatins 31.50% h2o2 by mass find the mass of water in the solution
April 12, 2010

math
I'm doing solving quadratic equations.I need help with couple of problems. k(k+5)=0,4r^2=100
April 7, 2010

Physics
A particle of mass m moving at 5 m/s in the positive x direction makes a glancing elastic collision with a particle of mass 2m that is at rest before the collision. After the collision, m moves off at an angle of 45 degrees to the x axis and 2m moves off at 60 degrees to the x...
April 6, 2010

computers
Explain what the Easter eggs in microsoft are? They are like hidden messages right? Why do they put them in there? Can they still put them in there? Why would they want to do put hidden messagesin their programs. Where can I find out more inmformation?
April 5, 2010

social studies
how is the iroquois confederacy diff. from the colonial government?
March 25, 2010

social studies
comapare and contrast the Irouquios confederacy and the colonial government.
March 25, 2010

Math
A set of scores with a normal distribution has a mean of 32 and a standard deviation of 3.7. Which score could be expected to occur the least often?
March 25, 2010

6th grade
what happened to Rome after the Punic Wars?
March 24, 2010

algebra
-4x^2-18x+10
March 23, 2010

math
Can you help with three problems 1)2x^2+7x+3 2)6x^2+5x-4 3)4x^2+12x+9 I have to factor this problems.Please help
March 17, 2010

math
Erin takes a total of 5 hours in her boat to travel a distance upriver and return downriver the same distance. If the time traveling upriver is twice the time traveling downriver, how many hours does each trip take? How do I put this into two equation and use the matrix to ...
March 16, 2010

chemistry
How many grams of CH4 are needed to react with 160.0 grams of Br2
March 15, 2010

physics
Gold ions (Au+) are accelerate to high speeds using electric fields. These ions are then passed through a region where uniform electric E and magnetic B fields are present. If the ions are traveling to the right, which configuration of E and B will serve as a velocity selector...
March 13, 2010

algebra
hi I need help with it!!!! HELP!!!!!
March 13, 2010

math
x^2-8x+16
March 12, 2010

physics
thank you!
March 7, 2010

physics
Any dielectric material other than vacuum has a maximum electric field that can be produced in the dielectric material before it physically or chemically breaks down and begins to conduct. This maximum electric field is called dielectric strength. The dielectric strength for a...
March 7, 2010

PHYSICS
A rectangular piece of gold is 3.6 cm long and 3.5 cm wide. How deep is the piece when it displays a resistance of R = 1.51 ìù for a current that flows along the depth-direction? --- p is found in a table...right? and then.. R=pl/A R=pl/(2dw+2wl+2dl) then solve ...
March 7, 2010

American History
New England factories were initially located in the countryside because? Why
March 7, 2010

western civilization
Judaism and Islam shere the belief that ________?
March 7, 2010

Chem = )
Write the complete ionic equation for BaCl2 + NaOH ----> Al2(SO4)3 + BaCl2 ---> Al2(SO4)3 + NaOH ---> NaOH + Zn(No3)2 ---> BaCl2 + NaI --->
March 3, 2010

ALBERGA
Find the value of y 3x-2y=6,x=2+3y
March 1, 2010

Physics
At what distance from a carbon nucleus is the electric potential 1.8 V? Carbon atoms have 6 electrons in the atomic shell ...im very confused with this question, please help!
February 28, 2010

chemistry
A 2.500 gram sample of hydrate of calcium sulfate loses 0.532 grams of water when heated. Determine the mass percent of water in the hydrate and the formula of the hydrate.
February 27, 2010

Physics
An electron enters a parallel plate apparatus 10.0cm long and 2.0cm wide, moving horizontally at 8.0 × 10^7 m/s. (top plate is positive, electron is 1.0cm from each plate..) The potential difference between the plates is 6.0 × 10^2 V. Calculate... (a) the vertical ...
February 26, 2010

math
482 multiplied by 8,624,798,324.287
February 26, 2010

physics
How much kinetic energy is gained by an electron that is allowed to move freely through a potential difference of 2.5 × 104 V?
February 24, 2010

Physics
A 1.0 × 10−6 C test charge is 40.0cm from a 3.2 × 10−3 C charged sphere. How much work was required to move it there from a point 1.0 × 102 cm away from the sphere? what formula(s) should be used to calculate work...?
February 24, 2010

PHYSICS
Humid air breaks down electrically when its molecules become ionized. this happend in an electric field |E|=3*10^6 N/C. In that field, calculate the magnitude of the electric force on an ion with a single positive charge. ..when they say a single positive charge do they mean +...
February 24, 2010

math
bill is 6
February 24, 2010

Chem
Give the ideal bond angle for BrO3- ion? I know this has trigonal bipyramidal geometry and therefore the bond angle is < 109.5. Is there a way to determine a more specific bond angle?
February 12, 2010

Chem
How many sigma bonds are there in trypophan? I know the answer is 28 but I don't know how to get that answer. Can someone please explain?? Thanks!
February 12, 2010

Chemistry
What is the product of Bromo Blue, CaCl2 (calcuim cloride) and NaHCO3 (baking soda)?
February 5, 2010

Pre Cal
1 --------- 2x^2-2 --------------- 2 + x ---- ------- x+11 x^2-2x-3
January 29, 2010

chemistry
How much energy (in kilojoules) is released when 12.3g of steam at 121.5degree C is condensed to give liquid water at 64.5 degree C? The heat of vaporization of liquid water is 40.67 kj/mol, and the molar heat capacity is 75.3 J/(K mol) for the liquid and 33.6 J/(K mol) for ...
January 25, 2010

chemistry
What is the vapor pressure of CS2(in mmHg) at 18.5degree C? Carbon disulfide, CS2, has Pvap= 100mm at -5.1 degree C and change in Hvap = 28.0 kj/mol .
January 25, 2010

chemistry
At what temperature (in degrees C) does acetone have Pvap= 102 mmHg?
January 25, 2010

9th grade Math
I need help in creating 3 Math problems that has to do with Baseball. Does anyone know how to or websites to help me...
January 25, 2010

Math
It wasn't me. I don't understand how to do the entire thing.
January 23, 2010

Math
How would you explain how to do this problem step by step in words? The answer is suppose to be 43/128 11/16-(-3/4)^2/2^3/5
January 23, 2010

Math
A marching band has 88 students. If the band limits the group to marching in 11 rows, how many students will march in each row?
January 23, 2010

math
on a centemeter ruler where is .13 m?
January 21, 2010

chemistry
How much energy (in kilojoules) is released when 12.3g of steam at 121.5 degree C is condensed to give liquid water at 64.5 degree C? The heat of vaporization of liquid water is 40.67kj/mol , and the molar heat capacity is 75.3 J/(K mol) for the liquid and 33.6 J/(K mol)for ...
January 20, 2010

physics
lots of questions 1) a 2N and 6N force pull on an object to the right and a 4N force pulls to the left a 0.5 kg object what is the net force on the object 2)a 20mkg bike accelerates at 10m/s2 with what force was the person pedaling 3)if a person is pushing a cart with a force ...
January 15, 2010

physics
if a person pulls on a cart to the right with a force of 10N and a second person pulls to the left with a force of 3N what is the net force (+ direction)on the cart
January 15, 2010

physics
a sled is being pulled to the left by 5 dogs, each dog pulling with 6 newtons of force what is the net force
January 15, 2010

science
When a truck pulls a trailer, the trailer and the truck acclerate forward even though the action and reaction forces are the same size but are in opposite direction. Why don't these force balance each other
January 12, 2010

algebra 9
the sum of radical 5 and radical 45 is?
January 7, 2010

Math
2364
January 5, 2010

chemistry
A 2 x 10^-3 M solution of MnSO4 is gradually made more basic by adding NaOH. At what pH will manganese(II) hydroxide begin to precipitate? [Ksp of Mn(OH)2=2 x 10^-13]
December 18, 2009

math
How many liters are contained in a cube with each edge 1m? HOW do you do this? How do I know how many liters fits into a meter?
December 16, 2009

math
A cylindrical can of cleaner holds 1 L of liquid. What is its height if the diameter of the base is 10 cm? How do I do this? I need to show my work AND I need to understand how to do it.
December 16, 2009

math
The two cereal boxes shown have corresponding edges in a ratio of 2:3.If the smaller box sells for $2.50 and the larger box for $4.00, which is the better buy? Why? What assumption(s) do you have to make when solving the problem? Estimate, then check. I think the answer is the...
December 16, 2009

math
A cylindrical can of cleaner holds 1 L of liquid. What is its height if the diameter of the base is 10 cm? How do I do this? I need to show my work AND I need to understand how to do it.
December 16, 2009

math
So does 166.28 sound about right? I don't have any examples to base the answer against, so I am very leery of this.
December 16, 2009

math
How do I find out on a standard calculator what this is: A=1/2 (4 3 )(48) It's supposed to read 4 square root 3 I don't even know how to input this into my calculator. Can someone tell me how? thanks!
December 16, 2009

Physics
A girl kicks her soccer ball with a velocity of 2m/s at an angle of 40 degrees with the horizontal. what is the total time? what is the ranger? and what is the max height of the ball?
December 16, 2009

geometry/math
How do I find the area and perimeter of a square when all I'm given is a diaganol line cutting the square into two equal halves, with the length of the line being 6square root2, and the angles of the square are all 90 degrees, with the angle bisected by the line being 45 ...
December 16, 2009

spanish
are these sentances correct? Las jirafas con los cuellos cortos vio la jirafa con el cuello largo. Las jirafas con los cuellos cortos pensaban que un largo cuello es muy guapo. Quisieron tener largos cuellos también. Las jirafas fueron a Frank. Esperan que él ...
December 15, 2009

english
What are the differences and similarities between Modernism to Postmodernism. I get confused between these two.
December 15, 2009

math/geometry
a. Describe the different types of planes of symmetry and axes of symmetry of a regular octahedron. b. How many planes and axes of symmetry does a regular octahedron have? c. Make a sketch and compare the symmetry properties of a regular octahedron and a cube.
December 12, 2009

geometry
Why is it impossible for a regular polygon with more than six sides to tesselate the plane? I know it has something to do with the angles, but I'm not sure what to write for this. 3 hexagons tesselate the plane and they have angles at 120, but why can't an octagon? Why...
December 12, 2009

algbera
which ordered pair is a solution of the equation ? 3x+y=0 A.(-1,3) B.(3,-2)c.(-2,3) D.(3,-1)
December 9, 2009

Economics
This is what I've come up w/ so far... I just need to expand a bit.... Artificial supply creates artificial demand. Coupons don't work because the supply is not market driven. What they create is a black market. The value of coupons is inevitably to be determined by ...
December 8, 2009

Economics
How does a price ceiling undermine the rationing function of market-determined prices? How could rationing coupons insure that consumers with the highest values get the limited amount of a good supplied when government price ceilings create shortages? Fully explain your answer...
December 8, 2009

science
Chemical reaction
December 7, 2009

U.S History
Each quote is either from the Constitution (what part of it?) or the Bill of Rights (which amendment?) 1."He has endeavored to prevent the population of these states: for that purpose obstructing the Laws for Naturalization of Foreigners" 2."For cutting off our ...
December 7, 2009

statistic help pls
a car insurance company has determined that 6% of all drivers were involved in a car accident last year,among the 12 drivers living on one particular street,3 were involved a car accident last year.if 12 drivers are randomly selected what is the probability of getting 3 or ...
December 6, 2009

statistics
the participants in a television quiz show are picked from a large pool of applicants with approximately equal number of men and women.Among the last 11 participant there have been only 2 women.If participants are picked randomly,what is the probability of getting 2 or fewer ...
December 6, 2009

statistics
an airline estimates that 97%of people booked on their flights actually show up.if the airline books 70 people on a flight for which the maximum number is 68,what is the probability that the number of people who show up will exceed the capacity of theplane
December 5, 2009

to reiny
so would my equation be: d^2 + 3^2=6^2 d^2 + 9=36 d^2=27 d=square root of 27? d=5.197 or 5.2?
December 5, 2009

math/geometry
complete the statements: To find the length of the hypotenuse of a 45-45-90 triangle, multiply the length of one of the legs by:? Could the answer be .5??? to find the length of the shorter leg of a 30-60-90 triangle, multiply the length of the longer leg by:? To find the ...
December 5, 2009

geometry again
I have a pic of a right square pyramid with equilateral triangular faces with each side of the triangle measuring 6 in. i have a line "d" intersecting one of the triangles making 2 right angle triangles. Using the pythagoream theory- how do I find the distance d? I ...
December 5, 2009

geometry
The skipper of a boat knows that the water is too shallow to bring his boat inside a "danger semicircle" that goes from lighthouse to lighthouse. How can the angle between his sightings of the two lighthouses help him decide when he is entering the danger zone? How ...
December 5, 2009

re: geometry
The boat is outside of the semicircle. So how can his angle help him decide when he is entering the dangerous semicircle? is there a certain theory that this pertains to? I still don't understand. Please, help again? thanks
December 5, 2009

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