Wednesday

May 4, 2016
Total # Posts: 1,749

**calc**

the tangent line to the graph of y=sin x at the point (2pi/3, (radical 3)/2) crosses the sine graph at the point where x=?
*May 2, 2010*

**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*