Tuesday

February 9, 2016
Total # Posts: 671

**statistics**

a set of maths exame score mean is 70 and variance is 8. a set of english score has mean is 74 and variance is 16. for which exame whould a score of x=78 have a higher standing?
*May 5, 2012*

**calcalus**

Water is leaking out of an inverted conical tank at a rate of 12200 cubic centimeters per minute at the same time that water is being pumped into the tank at a constant rate. The tank has height 15 meters and the diameter at the top is 65 meters. If the water level is rising ...
*May 2, 2012*

**Chemistry**

KMno4+NaHso3
*May 2, 2012*

**physics**

A 40N force applied at an angle of 37 degrees above the horizontal pulls a 5kg box on a horizontal floor. the acceleration of the box is 3meter per second square. how large a frictional force must be retarding the motion of the box. a.50N b.13N c.17N d.25N
*April 20, 2012*

**physics**

a 2kg and a 4kg hang freely at opposite end of a light in-extensible string which passes over a small and light pulley fixed to a rigid support.calculate the acceleration of the system. a.3.3M/S square b.2.67m/s square c.4.41m/s square d.2.67m/s square.
*April 20, 2012*

**physics**

a 2kg and a 4kg hang freely at opposite end of a light in-extensible string which passes over a small and light pulley fixed to a rigid support.calculate the acceleration of the system.
*April 20, 2012*

**Thermodynamics**

Suppose an enzyme lowers the activation energy by an order of magnitude. What is the ratio of catalyzed rate to the uncatalyzed rate at at 25 °C? at 37 °C?
*April 9, 2012*

**Honors Chemistry**

1. 5 2. 1.0 x 10^-5 3. 2.5 4. 12 5. 1.26 x 10^-9
*April 6, 2012*

**math**

The perimeter of a rectangular pool is 84 feet. The width of the pool is half the length. What are the measurements of the rectangular pool?
*March 20, 2012*

**trig**

if cot(x-10)=tan(4x) what does x equal?
*March 4, 2012*

**chemistry**

how do you do electron dot diagrams?
*March 3, 2012*

**Math**

4*10=40 slices of bread. 18 ppl eat 2 slices each, making 36 eaten 36/40 slices were eaten
*March 1, 2012*

**Chemistry--Plz HELP!**

How would i go about balancing the following equation? My teacher said something about the charges: Silver Nitrate + Sodium Phosphate = Silver Phosphate + Sodium Nitrate
*March 1, 2012*

**Chemistry-Stoichiometry**

A 1.146 mixture of the solid salts Na2SO4 and Pb(No3)2 forms an aqueous solutionwith the precipitation of PbSO4. The precipitate was found to weigh 0.672g. The limiting reactant is Na2SO4. What is the percent by mass of each salt in the mixture?
*March 1, 2012*

**math 2nd grade**

simon ate 3/2 slices of an apple. Did he eat less than a whole apple or more than the whole apple. Draw a picture to show your answer
*February 29, 2012*

**Econnomics**

junanita has 6000 in a two year certificate of deposit (CD) money supply definitions
*February 28, 2012*

**MATH - area question **

I need help on where to begin with this problem. You are installing a new deck around your pool. The pool is rectangular with the dimensions 8m by 4m. The deck will surround the pool and will have a width by 2m. What is the area of the deck? I know that A=LxW and that the Area...
*February 27, 2012*

**Math (Area)**

I need help on where to begin with this problem. You are installing a new deck around your pool. The pool is rectangular with the dimensions 8m by 4m. The deck will surround the pool and will have a width by 2m. What is the area of the deck? I know that A=LxW and that the Area...
*February 27, 2012*

**math**

lisette drew a rectangle and divided it into fourths. She colored the whole rectangle. How many fourths were colored?
*February 27, 2012*

**math**

simon ate 3/2 slices of an apple. Did he eat less than a whole apple, the whole apple or more than a whole apple. Draw a picture to show the answer.
*February 27, 2012*

**MATH**

what addition fact can help you find 14-4? explain
*February 27, 2012*

**english**

what does this question mean?
*February 21, 2012*

**english**

also how does she describe her feelings as she waits for him?
*February 21, 2012*

**english**

ROMEO AND JULIET what are juliets feelings towards romeo in act 3 scene 2 from lines 1-35?
*February 21, 2012*

**chemistry**

Sketch one face of a simple cubic unit cell of side a for the case when the maximum fraction of the lattice in volume is filled with atoms, and each atom is approximated by a hard sphere. (ii) What is the radius of each atom in terms of a? (iii) What is the volume of each atom...
*February 19, 2012*

**engineering**

Sketch one face of a simple cubic unit cell of side a for the case when the maximum fraction of the lattice in volume is filled with atoms, and each atom is approximated by a hard sphere. (ii) What is the radius of each atom in terms of a? (iii) What is the volume of each atom...
*February 19, 2012*

**math**

for every 20 math books a school buys, they they get 7 aditional books for free. The school needs 297 math books. What is the total number of math books the school must buy in order to receive 297 math books in all?
*February 8, 2012*

**Physics**

a boat sails steadily across a river ,with velocity 20 m/s. if the river has width 30 m, how long does it take the boat to get across ,and how far downstream is it swept by the currenty first
*February 6, 2012*

**Dynamics**

A quarterback throws a football with a velocity vo at an angle of 45o with the horizontal. At the same instant a receiver standing 20 ft in front starts running down the field at 15 ft/s and catches the ball. What is the distance of the receiver from the quarterback when the ...
*January 30, 2012*

**math**

Thank You so much Ms. Sue,
*January 26, 2012*

**math**

3rd grade create an algorithm that has a difference of 20
*January 26, 2012*

**Math**

what is the scientific notation of 1,890,000
*January 24, 2012*

**physics**

A stone is launched straight up by a slingshot. Its initial speed is 20.1 m/s and the stone is 1.30 m above the ground when launched. Assume g = 9.80 m/s2. (a) How high above the ground does the stone rise? (b) How much time elapses before the stone hits the ground?
*January 24, 2012*

**calculus **

reverse the order of integration integration 1-e integration 0-lnx dy dx
*January 12, 2012*

**English**

ok thank you
*December 15, 2011*

**English**

I do not know I do think its situational though
*December 15, 2011*

**English**

Situational? I do not know I'm not very good at irony.
*December 15, 2011*

**English**

"Out of spite, the human being pretended not to believe that it was Snowball who had destroyed the windmill…The animals knew that this was not the case." What kind of Irony is this?, Situational,Dramatic, or Verbal
*December 15, 2011*

**Learning skills**

Explain the SQR3 OF READING.
*December 12, 2011*

**Learning skills**

What are the advantages of study reading?
*December 12, 2011*

**history**

Thanks again
*December 8, 2011*

**history**

How did the use of advanced technology make World War II the most devastating war in history?
*December 8, 2011*

**Science**

thank you sooooo much!
*December 8, 2011*

**Science**

Was Daniel Bernoulli for the atomic theory or against it and explain why?
*December 8, 2011*

**english**

can anyone help me with explicationg act 3 scene 1 (setting) (charcater) (plot) (theme) of macbeth?
*December 5, 2011*

**math**

The force F (in Newtons) required to move a box of mass m kg in motion by pulling on an attached rope is F(x) = f m g/(cos(x))+ f (sin(x)) where x is the angle between the rope and the horizontal, f is the coefficient of static friction and g = 9.8 m/s^2. Find the angle x that...
*November 17, 2011*

**Calculus**

The answer might be easy if you told us the minimum height requirement. Since the ceiling is cheaper, the lower the height, the cheaper it will be. Once we know that, the squarer the building, As equal as possible in length & width, the smaller the perimeter and therefore the ...
*November 13, 2011*

**Finance**

Trying to figure out how to do problems like these. So confused! 1. The receivables turnover for 2009 is 10 times. 2. All sales are on account. 3. The profit margin for 2009 is 14.5%. 4. Return on assets is 22% for 2009. 5. The current ratio on December 31, 2009, is 3.0. 6. ...
*November 13, 2011*

**calculus**

Differentiate the function. h(x)= ln(x+ sqrt(x^2 -4))
*November 9, 2011*

**chemistry**

A student measures 0.2452 g of a monoprotic solid acid, and dissolves the solid in water to make 100.0 mL of solution. the entire solution is titrated to a phenolphthalein endpoint with 45.06mL of 0.1725M KOH. A. what is the molarity of the acid solution? B. what is the molar ...
*November 9, 2011*

**Calculator Help**

1. The csc^-1(1.23) I got 1.061 in radian mode 2. Cot^-1(-2.26) I got 0.8240 in radians 3. Cos^-1(-0.84) I got 2.568 Are these correct?
*October 30, 2011*

**Physics**

Sam, whose mass is 72.0 kg, takes off down a 51.0 m high, 11.0^\circ slope on his jet-powered skis. The skis have a thrust of 180 N. Sam's speed at the bottom is 43.0 {\rm m/s}. What is the coefficient of kinetic friction of his skis on snow?
*October 24, 2011*

**algebra **

Susie has a budget of $92 to spend on clothes. The shorts she wants to buy are on sale for $14 each. The shirts are on sale for $12 each. If Susie purchases four shorts, what is the maximum number of shirts she can buy to go with the shorts?
*October 24, 2011*

**science**

How much work does it take to raise a 3kg object 5m into the air? (a) What is the potential energy of the object when it is 5m in the air? (b) What does this tell you about the potential energy you get when you do work to lift an object? (c) If you drop the object, how fast is...
*October 22, 2011*

**reading strategies**

reading titles and headings,and trying to get an overview of what lies ahead in reading passageis called
*October 22, 2011*

**science**

A 4kg block is sitting on the floor. (a) How much potential energy does it have? (b) How much kinetic energy does it have? (c) The block is raised to 2m high. How much potential energy does it have? (d) The block is raised to 4m high. How much potential energy does it have? (e...
*October 22, 2011*

**physics**

as a baseball player strikes the ball with his batt the 1kg bat applies an average force of 250N on the .15kg baseball for .2 seconds. A) what is the force applied by the baseball on the bat? what is the acceleration of the baseball? C) what is the speed of the baseball at the...
*October 20, 2011*

**physics**

Standing on a balcony, you throw your keys to a friend standing on the ground below. 1.2 seconds after you release the keys, they have an instantaneous velocity of 15.4 m/s, directed 60° below the horizontal. What initial velocity did you give them?
*October 18, 2011*

**History**

what were 5 new weapons used in world war 1?
*October 17, 2011*

**calculus**

lim (9x^4+2x+1)^1/2/(3x^2+1) as x->-infinity
*October 9, 2011*

**physics **

A cube of aluminum is 4cm on each side.find the mass of the cube. (Density of aluminum is 2.7g/cm3
*October 6, 2011*

**math**

regroup 22: 2 tens, 2 ones; 1 ten, 12 ones Name the word that describes what was done to show the number in different ways.
*October 3, 2011*

**math**

write three number sentences where difference is 50.
*October 3, 2011*

**science**

Steel expands 1 part in 100 000 for each 1°C increase in temperature. If the 1.5km main span of steel suspension bridge had no expansion joints, how much longer would it be for a temperature increase of 20°C?
*October 2, 2011*

**chemistry**

194
*September 27, 2011*

**trig**

A space shuttle 200 miles above the earth is orbiting the. Earth once every 6 hours. how far does the shuttle travel in one hour? Note the radius of earth about 4000 miles.
*September 17, 2011*

**English check please help me out**

English check please help me out "Accident and Recovery.
*September 14, 2011*

**Math**

around 55% exactly .5472
*September 6, 2011*

**marketing**

For business marketing, we are planning to make and sell soap, with our target audience as teenagers. What do you think we need to do in order to attract lots of customers and for them to sell?
*August 31, 2011*

**science fair ideas**

thank you both!
*August 28, 2011*

**science fair ideas**

What are some really good/cool science fair ideas?
*August 28, 2011*

**physical science**

I talked too my teacher over the this morning and he said that his question is written correctly but after i tried to tell him thats what proves the plate tectonic theory he said that i needed to research it more and re-evaluate my answer
*August 28, 2011*

**physical science**

One observation that regards the magnetic stipes on the ocean floor that would disprove the theory of platetectonics would be?
*August 28, 2011*

**science**

please help!
*August 27, 2011*

**science**

One observation that regards the magnetic stipes on the ocean floor that would disprove the theory of platetectonics would be?
*August 27, 2011*

**alegbra**

it may be a division as a one is overtop so the posibility is that the answer may be 6.5
*August 27, 2011*

**math**

i am good at math i go to school every day i love school so much i love my teacher and my school is name is sonoran sky
*August 25, 2011*

**english **

sir explain me about question tags..?
*August 21, 2011*

**Biology**

What is the primary focus on all biological studies?
*August 11, 2011*

**math**

A furniture store receives an invoice dated Sept. 27 for 5 bedroom sets at $3,000 each. The invoice indicated a trade discount of 5/8/3. The seller of the furniture prepaid the freight of $200. Terms were 2/10 EOM. Assuming Mel pays on Nov. 2, what amount would be paid. (Be ...
*August 6, 2011*

**physics**

A river flows at a uniform speed of 2ms-1 and is 100m wide. A motor boat has a maximum speed in still water of 7ms-1
*August 4, 2011*

**statistics**

You want to estimate the grades of st2%atistics students who gets grades of C or better. How many students should you survey to be 95% confident that the sample percentage is off by no more than 2 percentage points.
*July 26, 2011*

**world history**

How is the historical event of the 1981 Springbok Tour is, or was, of significance to New Zealanders.
*July 3, 2011*

**chemistry**

When magnesium is burnt completely in air the totol mass of the product was found to be grater than the original mass of the piece of magnesium.explain
*June 14, 2011*

**statistics**

A certain geneticist is interested in the proportion of males and females in the population that have a certain minor blood disorder. In a random sample of 1500 males, 75 are found to have disorder, whereas 80 of 2000 females appear to have disorder. Find a 90% confidence ...
*June 3, 2011*

**statistics**

It is claimed that an automobile is driven on the average more than 20,000 kilometers per year. Random sample of 10 automobile owners are asked to keep a record of the kilometers they travel. If the sample mean and standard deviation of automobile driven are found to be 23,500...
*June 3, 2011*

**statistics**

A sample of 25 men has a mean weight of 65kg with standard deviation of 8kg. Suppose that the weight of men follows normal distribution with a standard deviation of 10kg. Find a 95% confidence interval for the population mean μ.
*June 3, 2011*

**statistics**

If 50% of the automobiles sold by an agency for a certain car are equipped with diesel engines, let X represent the number of diesel models among the next 5 cars sold by this agency, write the probability distribution of X.
*June 3, 2011*

**MATH**

553seven x 5seven
*May 17, 2011*

**math**

it costs $.20a min for ashley to call her best friend in mexico she calls her after school every day she called her friend @ 3:30 yesterday the cost was $8.60 what time did she end her call explain
*May 10, 2011*

**university**

Compare and contrast packet and circuit switching in 250 to 300 words. Which is more commonly used? What are the advantages and disadvantages of each?
*May 9, 2011*

**science**

what is the chemical equation for sodium nitrate?
*May 8, 2011*

**Calc**

this service is so nice make engineering services to coming education learning
*May 3, 2011*

**Trigonometry:Angles of Elevation and Depression**

Carlos is making some observations from the roof of a building. Which angle is the angle of depression from Carlos to the car?
*May 1, 2011*

**math**

what is tan p,out of p,8,q,6,r,and 10,in a fraction form?
*April 21, 2011*

**Math**

In a fish tank, there are two fewer blue fish than three times the number of yellow fish. If there are 10 blue fish, what is the number of yellow fish(n). Write an equation to solve for n.
*April 18, 2011*

**pre cal**

assume the angle is in the first quadrant, and sin theta equals 1/5. what is sin 2 theta?
*April 17, 2011*

**math**

simplify and state the restrictions of a^2- 9b^2 / 5a^2-11ab-12b^2
*March 27, 2011*

**science**

Calculate the molarity of each solution. a) 1.0 mol KCl in 750 mL of solution b) 0.50 mol MgCl2 in 1.5 L of solution
*March 24, 2011*

**computer science**

please write this in C. Thanks
*March 4, 2011*