Wednesday
November 26, 2014

Posts by emma


Total # Posts: 1,227

Biology
When milk is present, the lactose repressor binds to the lac operon. Is this true or false? I think it is false.....?
October 16, 2008

Math
This site is great
October 7, 2008

AP Chemistry
what does pv/nRT tell you?
October 2, 2008

8th grade home economics
make it all over again x
September 24, 2008

English
Sorry if it seems so sad , the ending is a LOT happier
September 21, 2008

English
This is just the opening
September 21, 2008

English
I wrote this 2 years ok - please could you critique it A tale of dishonesty Our story takes place in Zakinthos – a place in Greece- long ago. It is all about the Princess of that fine land. Her name was Maria and she was sick of palace life. She stayed there as her love...
September 21, 2008

7 grade math
I need help on this one question please help me
September 18, 2008

ict
ive looked on the sites everyone has kindly helped with the ict homework but i`m stuck on the definition of groups on the internet . thankyou so much
September 16, 2008

pre calculus
Yes,what do you do at that point? then you have the height as 4, but where does the 15 come in?
September 1, 2008

Science
If you eat more than 5 advils, what's the harm?
August 5, 2008

math
two puppies are chosen at random from a box at the mall. what is the probability of these outcomes 1)2;a tail then a head
May 26, 2008

math: percent and fractions
When writing a percent as a decimal,why do you move the decimal point 2places
April 6, 2008

math: percent and fractions
If 6eggs in 50% of an egg crate how many eggs are in the whole
April 6, 2008

math: percent and fractions
40% of jennies friends play kickball on weekends,what fraction of her friends don't play kickball
April 6, 2008

solar systems
if the earth rotated every 16 hours how would this affect solar eclipses, the phases of the moon and our tides
April 1, 2008

math
this is tha question a television series consits of 8 programes, each 3 over 4of an hour. how many 3hour tapes would be required to tape the series please tell me how you work it out
April 1, 2008

physical science
which one of the following frequencies of a wave in the air can be heard as an audible sound by the human ear? A.0.10Hz B 10 Hz C. 1,000 Hz D. 100,000Hz
March 25, 2008

science
who is the primminster of Canada
March 16, 2008

English
what rhetorical devices does david suzuki use in his opening sentence, and how does it begin to introduce his subject?
March 15, 2008

math
if you have x squared x and then a blank what is tha value of that blank x2+x+b what is b perfect square of a trinomial?
March 12, 2008

Chemistry
What is the Lewis structure for IF4-?
March 10, 2008

Math
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February 11, 2008

Social Studies
What's the capital of Falkland?
January 15, 2008

math
Antonio said, "To solve 506-288, I can think of 5 hundreds as 50 tens." How might this help him subtract?
January 9, 2008

Physics (again, sorry)
A swimmer maintains a speed of 0.15 m/s relative to the water when swimming directly toward the opposite shore of a straight river with a current that flows at 0.75 m/s. (a) How far downstream is the swimmer carried in 1.5 minutes? (b) What is the velocity of the swimmer ...
November 29, 2007

Physics
Sorry I wasted your time! I understand it now!
November 29, 2007

Physics
A small plane takes off with a constant speed of 130 km/h at an angle of 37 degrees. In 3.00 s, how high is the plane and what horizontal distance has it traveled from the lift-off point. I know I should convert 130km/h into meters per second, but after that I am stuck. Can ...
November 29, 2007

history
Research it then.
November 25, 2007

Grammar
This is a TV Show though
November 25, 2007

Grammar
How do you write tv shows? For example: Some high school students have known that they want to become doctors ever since they picked up their first toy stethoscope or watched their first episode of Grey's Anatomy. How do I write Grey's Anatomy? Italicize or quotes? ...
November 25, 2007

spelling
My teacher wanted me to tell the class what Honolulu meant and Hawaii meant. I really had no idea want they ment, so when I got home I went on the computer to try to figure out the qestion. As I went on the computer I searched really hard but I could not find the answere! Of ...
November 18, 2007

math
The area of a rectangular field is 12,750 square yards. The width is 150 feet. What is the length of the field in yards.
November 6, 2007

math
19
October 31, 2007

Lunch
What should i take for lunch tomorro? i get hungry lots
October 29, 2007

science
Why do 6-ounce boxing gloves hit harder than with 16-ounce gloves?
October 21, 2007

science
why is a punch more foreful with a bare fist than with a boxing glove?
October 21, 2007

science
Which has the greater momentum when they move at the same speed- an automobile or a skateboard? Which requires the greatest stopping force?
October 21, 2007

science
If you throw an egg against a wall, the egg will break. But if you throw it at the same speed into a sagging sheer, it may not break. Why?
October 21, 2007

science
When rollerblading,why is a fall less harmful on a wooden floor than on a concrete floor that has less give?Explain in terms of impulse and momentum.
October 21, 2007

Algebra-please check my work
check my answers please. Use the Intermediate Value Theorem to determine whether the polynomial function has a real zero between the given integers. f(x) = 2x3 + 10x2 - 8x - 5; between 1 and 2 -I got: f(1)=1 and f(2)=35;no Determine the maximum possible number of turning ...
October 15, 2007

spainsh
i need to find spainsh words begining with all the letters of the spainsh alaphbet. i can't find any for k, x, z or w
October 9, 2007

Social Studies
need inside map of La Monte school r 5
September 20, 2007

Social Studies
need map of La Monte school
September 20, 2007

Physic
what type of materials do people use as ohmic conductors? thanks.
September 16, 2007

economics- opportunity cost
what does thinking at the margin help compare
September 10, 2007

Pysics Word Problem
4. An automobile is traveling at 30 km/hr. It accelerates at 3 m/s2 until it has covered 100 meters.. What is its new velocity? I asked my teacher on what formula I should use and said I should use this one: V^2= Vo^2+2ax (V^2 is the velocit, Vo is the initial velocity, a is ...
August 29, 2007

Physics Word Problem
4. An automobile is traveling at 30 km/hr. It accelerates at 3 m/s2 until it has covered 100 meters.. What is its new velocity? I asked my teacher on what formula I should use and said I should use this one: V^2= Vo^2+2ax (V^2 is the velocit, Vo is the initial velocity, a is ...
August 29, 2007

Physics
Could you please check my answers and units.Also, help me with 3 and 4, I dont quite understand them. Thanxs! 1. An automobile starts from rest and accelerates at 3m/s2 for 4 seconds. How fast is it going after acceleration? -I got 12 m/s 3. At time = 0 an automobile already ...
August 28, 2007

Physics
I am still not understanding. Like for number 3, this is as far as I got 30km/36000000. Then for number 4, would it be similar as to number 3? Also, did I get number 1 correct?
August 27, 2007

Physics
Could you please check my answers and units. Thanxs! 1. An automobile starts from rest and accelerates at 3m/s2 for 4 seconds. How fast is it going after acceleration? -I got 12 m/s 3. At time = 0 an automobile already traveling at 30 km/hr. accelerates at 3m/s2 for 2 seconds...
August 27, 2007

Science
I have some equations that I would like checked. Thanxs! 1. An automobile starts from rest and accelerates at 3m/s2 for 4 seconds. How fast is it going after acceleration? 3m/s^2 / 4 = .75 m/s 2. If an automobile travels at 30 km/hr. for 2 hours, how far does it go? d=(30 km/...
August 26, 2007

maths
how do i solve this equation? 2/(x+1)=1/(x-1) - (1/(2x-1)) thx Get a common denominator (x+1)(x-1)(2x-1) then, each term, multipy it out. Gather terms, solve.
July 12, 2007

maths
how do i solve this equation? 21(X-(1/7))^2= 3/7 thx Divide both sides by 21 Take the square root of both sides. Rewrite it as x - (1/7)= sqrt [(1/21)*(3/7)] = sqrt[(1/7)*(1/3)(1/7)] = (1/7) sqrt(1/3) x = (1/7)[1 + sqrt(1/3)] tahnks x=(2)/(7),0
July 12, 2007

maths
how do i factorise this?: p^2+2p+1-t^2 thx. p^2 + 2p + 1 - t^2 = (p+1)^2 - t^2 This is the difference of two squares, so it can be rewritten =(p+1+t)(p+1-t)
July 11, 2007

Maths
solve the following pair of simultaneous equation: (x/a)+(y/b)=1 (x/b)+(y/a)=1 can someone help please?i have no idea how to solve it =( x/(ab) + y/b^2 = 1/b x/(ab) + y/a^2 = 1/a Subtract one from the other y(1/b^2 - 1/a^2) = 1/b - 1/a y(1/b + 1/a)(1/b - 1/a) = (1/b - 1/a) ...
July 11, 2007

maths
each of the students in a class writes a dirrerent 2 digit number on the whiteboard. the teacher claims that no matter what the students write, there will be at least three numbers on the whiteboard whose digits have the same sum. what is the smallest number of students in the...
July 7, 2007

ACCOUNTING
#1 chin company incurred direct materials costs of $300,000 during the year. manufacturing overhead rate is 70%. how much are chin company total manufacturing costs for the year?
July 6, 2007

maths
five bales of hay are weighted two at a time in all possible combinations. the weights, in kilogrames, are: 110,12,113,114,115,116,117,118,120 and 121 what is the weight, in kilograms, of the heaviest bale? can someone please show me how to do this question?thx. Something is ...
July 6, 2007

physics
a gardener pushes a wheelbarrow. according to Newton's third law the barrow's reaction force on the gardener is the exact opposite of her force on the barrow. a bystander concludes the gardener and barrow will not move because they push equally against each other. how ...
June 29, 2007

physics
why are you more likely to have an accident on your bicycle if you are riding it on a gravel or wet pathway?how do i explain this using newton's law(s)? thanks consider newtons first law. Then, consider friction on the tire on gravel, wet vs dry pavement. isn't it ...
June 29, 2007

Physics
when you watch a cricket player catch the cricket ball, you will notice that he allows his hands to trace the path of the ball as it reaches him what is the physics principles behind this? and baseball catching is different, as the catcher moves towards the ball often with his...
June 28, 2007

Physics
In the game of netball, players often move quickly and then come to a sudden stop. how does the abrupt nature of the game relate of the knee injuries netball players frequently suffer? thanks IT sesms to me that abrupt stopping (the feet stop first, and then the knee ligaments...
June 28, 2007

Cannabis
What are the reasons for legalising cannabis? One of the most popular arguments centers around medical purposes, even if for no other uses. http://www.drugwarfacts.org/medicalm.htm http://news.bbc.co.uk/1/hi/uk/1869897.stm (Broken Link Removed) Of course, there are arguments ...
June 26, 2007

math
write 64 as a product of 2's what do i do??? factor 64 into product of twos. 2*2*2=8, that ought to get you started.
June 18, 2007

math
what does "write 81 as a product of 3's" mean? what do i do? 3*3=9. That ought to get you started.
June 18, 2007

math
what does "write 81 as a product of 3's" mean? what do i do? 3 to the 4th power, which can be written 3^4 or 3x3x3x3, equals 81.
June 18, 2007

physics
In late 2001, steve Fossett tried to fly a balloon nonstop around the world . why on his attempted circumnavigation of the globe did Steve attempted to travel at an altitude of approximately 10000 m? That is a typical stratosphere flight altitude, where the pilot can usually ...
June 16, 2007

physics
in Melbourne there used to be a huge shopping centre called "diamaru" built around an old "shot tower". hot lead globules were poured from the top of the tower which fell into a large pool of water at the foot of the tower. in this way spherical lead shot ...
June 15, 2007

child care
why is it important to choose appropriate play provision for a child? (please help i am very stuck and my assigment is due in tomorrow) Young children learn by playing. They develop large and small motor skills, intellectual knowledge, social adaptation, and information about ...
June 12, 2007

child care
how does poverty affect the growth and develpment to children Please try some reading here: http://www.google.com/search?as_q=children+poverty&hl=en&num=10&btnG=Google+Search&as_epq=&as_oq=&as_eq=&lr=&as_ft=i&as_filetype=&as_qdr=all&as_nlo=&as_nhi=&as_occt=title&as_dt=i&...
June 7, 2007

spanish
I have to fill in the gap with an adjective and i am really stuck on these questions: 1)Es........asomarse a la ventanilla 2)Carmen está...... le duele la cabeza 3) En la mano ......... llevo dinero, y en la no llevo nada. 4)Qué olor! El pescado no esta Pleas ...
June 4, 2007

social studies
What are some problems or controversies regarding the use of the mineral silver? Check this article for the many uses of silver, including in alternative medicine. http://en.wikipedia.org/wiki/Silver#Folklore_and_mass_culture
May 31, 2007

social studies
How is silver harvested in Australia? Silver is not "harvested." It's "mined." http://www.google.com/search?q=australia+mining+silver&rls=com.microsoft:en-us:IE-SearchBox&ie=UTF-8&oe=UTF-8&sourceid=ie7&rlz=1I7SUNA
May 31, 2007

social studies
Who manages the natural resources of Australia? http://www.google.com/search?q=australia+manager+natural+resources&rls=com.microsoft:en-us:IE-SearchBox&ie=UTF-8&oe=UTF-8&sourceid=ie7&rlz=1I7SUNA =)
May 31, 2007

maths(urgent)thanks.
a parabola with turning point at (1,-2) and passing through the origin.find the equation of this parabola. how do i do this? can someone please show me how to solve it step by step?thanks! You know that at x = 0 the function is zero. Because the turning point is at x = 1 must ...
May 30, 2007

maths help needed!(urgent)
find the equation of the tangent to y=x-(a^3/x^2) at the point (a,0) how to i work this out??can someone please show me how to do it step by step?thanks!!! Take the dervative of y y= x- a^3 x^-2 y'=1+2a^3/x^3 so the equation for the tangent is y= mx + b where m is y' ...
May 30, 2007

Math again
Rearrange to give d in terms of e: (3d-7)/(4+5d) = e I got 3d - 5de = 4e + 7 but where do I go from there? Thanks :) 1st you must Multiply the polynomial. Please try the tutorial at the following site: http://www.webmath.com/polymult.html
May 28, 2007

Maaaath
6/x + 6/x-5 = 1 I got to x^2 -17x +5 = 0 But I have no idea if that is right? How do I find the answer? Thanks 6/x 6/x-5 =1 multiply both sides by x x(6/x +6/x-5)= (1) x The denominator x will cancel giving: 6 + 6 --- = x -5 Now -5 into 6 = -1.2 so 6 -1.2= x x= 4.8
May 28, 2007

chemistry
which of the following compounds contains the lowest percentage by mass of nitrogen? 1) NH4NO3 2) (NH4)2 SO4 3) NaNO3 4) NH3 can someone please help me??what method should i use?how do i do this? Find the molar mass of each compound by adding the molar masses of every atom (...
May 27, 2007

chemistry
liquids such as ethanol have a greater vapour pressure than water for any given temperature. comment on the strength of the intermolecular forces in ethanol compared to water.
May 27, 2007

maths
a ball is dropped from a height of 40cm onto a horizontal surface and bounces in a vertical line until it eventually stops on the surface. the ball bounces in such a way that it loses ten percent of its height for each bounce and will continue to do this until it comes to rest...
May 25, 2007

differentiation
by determining : lim f(x+h)-f(x) h->0 --------------- h show that if f(x)=2x^2+2 then dy/dx=4x. i figured out that f'(x) is 4x...but i am confused about what to do next...someone help? "i figured out that f'(x) is 4x..." That's the answer! dy/dx is ...
May 25, 2007

function
consider the function g(x)=x^3+5x^2-4x+4.determine: 1)g(37) 2)the value of x between zero and a hundred such that g(x)=145456 how do i do this? 1) put in 37 for x, and compute. 2) put in 145456 in for g(x), and solve for x. for the first one, just substitute 37 for x and ...
May 25, 2007

maths please check
a yacht is sailing at a speed of 12 knots due south in calm water. if the tacht encounters a current of 4 knots from bearing 040 degrees: determine the resultant speed and direction of the yacht. here is my answers: 15.28 knots from bearing 9.69 degrees.am i right? thanks. ...
May 25, 2007

maths
how do i find out the the equation of the line of symmetry for f(x)=ax^2+bx+c ? please explain it do me thanks! The line of symmetry runs through the vertex. so the x of the vertex is -b/(2a) and the equation of the line of symmetry is x = -b/(2a) e.g. for f(x) = 2x^2 - 12x + ...
May 25, 2007

parabolas
how do i find the equaion of the following parabolas? 1)intercepts at (2,0),(8,0) and (0,48) 2)turning point at (1,-2) and passing through the origin. can someone please teach me how to do this??thanks! The first: Write you standard equation of a parabola (it has two x ...
May 20, 2007

maths
f(x)=x^3+px^2+qx+6 this formula can also be written in "factorised form" that is, f(x)=a(x+b)(x+c)(x+d) can someone please teach me how to change a funtion into it's factorised form? thanks the following link has some nice step-by-steps illustrations and examples...
May 18, 2007

intro cal
the first 3 term of a geometric progression are k-4, 2k-4, 4k+4. what is the value of k? can someone help please! in any geometric progression any term divided by its previous term gives you the common ratio, so .... (2k-4)/(k-4) = (4k+4)/(2k-4) cross-multiply and proceed. I ...
May 18, 2007

physics
in different parts of a car air conditioner a liquid changes to a gas and a gas changes to a liquid. a)which of these changes causes the cooling?why? b)describe how the air conditioner removes heat from the car's cabin. can someone please help??thank you so much! it takes ...
May 14, 2007

physics
at a picnic a frind asks you for advice about cooling his warm bottle of soft drink.he can submerge the bottle in a bucket of water, or wrap the bottle in a cloth and then wet it with the water from the bucket.which should he do? i think the first option is right. but i can&#...
May 14, 2007

physics-please check
is this right?: when a form of energy changes from one form to another some energy may transfrm into a useful form, those useful form of energy is high grade energy.while the rest of the energy will always change to form we cannot use.which is called the low grade energy. if i...
May 14, 2007

physics-energy conservation
a mordern power station,or, more correctly, an energy station, converts heat energy into electrical energy at an efficiency od 50% if the station produces electrical energy at a rate of 1.00GW from burning coal, calculate the mass of coal it burns each day. the coal it uses ...
May 9, 2007

physics
jack measured that his racquet gives a squash ball 45.0J of kinetic energy when he hits it with a particilar shot.he also measures that it has 18.0J of kinetic energy after one bounce off the court wall. what percentage of its mechanical energy does the ball lose while it ...
May 8, 2007

physics
when a power station converts chemical or nuclear energy to electrical energy it converts about 50% of the energy to low grade heat suggest how people could use this energy before the power station operators allow it to enter the environment. why is this low grade heat energy ...
May 8, 2007

physics-energy conservation
some people refer to heat as "low grade energy. a)how is low grade energy different from high grade energy? b)give two example of high grade energy When heating a cup of tea, which would be preferable...a stove with a burner on top, or a heating pad? High grade energy is ...
May 8, 2007

physics-energy conservation
when you apply the brakes of a car its kinetic energy or energy of motion decreases. a)to what form of energy is the kinetic energy converted? b)where does the resulting energy end up? Do the brake drums on the wheels heat up? so does it convert into heat energy?and the ...
May 8, 2007

Science
Give examples of parasitism, mutualism and commensalism.
May 6, 2007

physics
why does an heater with a fan is more efficient than a similar heater that doesn't have a fan? It distributes the heat throughout the space (room) that is being heated.
May 4, 2007

physics-heat transfer
energy conscious homeowners often insulate their homes. one form of insulation is thick pads of loosely packed glass fibres.explain how these pads reduce heat transfer. how do thick curtains help reduce heat loss from the windows of a house? builders often insulate parts of ...
May 4, 2007

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