# Posts by ali

Total # Posts: 883

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?

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 ...

Chemistry
KMno4+NaHso3

statistics
245.95 and 274.05

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

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.

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.

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?

Honors Chemistry
1. 5 2. 1.0 x 10^-5 3. 2.5 4. 12 5. 1.26 x 10^-9

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?

Math
idiot

trig
if cot(x-10)=tan(4x) what does x equal?

chemistry
how do you do electron dot diagrams?

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

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

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?

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

Econnomics
junanita has 6000 in a two year certificate of deposit (CD) money supply definitions

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...

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...

math
lisette drew a rectangle and divided it into fourths. She colored the whole rectangle. How many fourths were colored?

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.

MATH

english
what does this question mean?

english
also how does she describe her feelings as she waits for him?

english
ROMEO AND JULIET what are juliets feelings towards romeo in act 3 scene 2 from lines 1-35?

physics
56.7

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...

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...

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?

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

Physics
56

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 ...

math
Thank You so much Ms. Sue,

math
3rd grade create an algorithm that has a difference of 20

Math
what is the scientific notation of 1,890,000

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?

Mathematics
Weight of $2.50 coffee be x kg Weight of$3.50 coffee be y kg 2.5x+3.5(20-x)= 2.8(20) 2.5x+700-3.5x=56 -x=56-70 x=14 14 kg of $2.50 coffee 20-14kg of$3.50 coffee Thus 14 kg of $2.50 coffee 6kg of$ 3.50 coffee

calculus
reverse the order of integration integration 1-e integration 0-lnx dy dx

English
ok thank you

English
I do not know I do think its situational though

English
Situational? I do not know I'm not very good at irony.

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

Learning skills

Learning skills

history
Thanks again

history
How did the use of advanced technology make World War II the most devastating war in history?

Science
thank you sooooo much!

Science
Was Daniel Bernoulli for the atomic theory or against it and explain why?

english
can anyone help me with explicationg act 3 scene 1 (setting) (charcater) (plot) (theme) of macbeth?

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...

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 ...

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. ...

calculus
Differentiate the function. h(x)= ln(x+ sqrt(x^2 -4))

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 ...

physics
A 1000kg automobile is moving along a straight highway at 10m/s. another car with mass 2000kg and moving with a velocity in the same direction 20m/s at 30m ahead of the first. find the momentum

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?

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?

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? 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... reading strategies reading titles and headings,and trying to get an overview of what lies ahead in reading passageis called 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... 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... 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? History what were 5 new weapons used in world war 1? calculus lim (9x^4+2x+1)^1/2/(3x^2+1) as x->-infinity physics A cube of aluminum is 4cm on each side.find the mass of the cube. (Density of aluminum is 2.7g/cm3 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. math write three number sentences where difference is 50. 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? chemistry 194 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. English check please help me out English check please help me out "Accident and Recovery. Math around 55% exactly .5472 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? science fair ideas thank you both! science fair ideas What are some really good/cool science fair ideas? 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 that's what proves the plate tectonic theory he said that i needed to research it more and re-evaluate my answer physical science One observation that regards the magnetic stipes on the ocean floor that would disprove the theory of platetectonics would be? science please help! science One observation that regards the magnetic stipes on the ocean floor that would disprove the theory of platetectonics would be? algebra it may be a division as a one is overtop so the posibility is that the answer may be 6.5 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 english sir explain me about question tags..? Biology What is the primary focus on all biological studies? 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 $200. Terms were 2/10 EOM. Assuming Mel pays on Nov. 2, what amount would be paid. (Be ... physics A river flows at a uniform speed of 2ms-1 and is 100m wide. A motor boat has a maximum speed in still water of 7ms-1 statistics You want to estimate the grades of st2%atistics students who gets grades of C or better. How many students should you survey to be 95% confident that the sample percentage is off by no more than 2 percentage points. world history How is the historical event of the 1981 Springbok Tour is, or was, of significance to New Zealanders. chemistry When magnesium is burnt completely in air the totol mass of the product was found to be grater than the original mass of the piece of magnesium.explain statistics A certain geneticist is interested in the proportion of males and females in the population that have a certain minor blood disorder. In a random sample of 1500 males, 75 are found to have disorder, whereas 80 of 2000 females appear to have disorder. Find a 90% confidence ... statistics It is claimed that an automobile is driven on the average more than 20,000 kilometers per year. Random sample of 10 automobile owners are asked to keep a record of the kilometers they travel. If the sample mean and standard deviation of automobile driven are found to be 23,500... statistics A sample of 25 men has a mean weight of 65kg with standard deviation of 8kg. Suppose that the weight of men follows normal distribution with a standard deviation of 10kg. Find a 95% confidence interval for the population mean μ. statistics If 50% of the automobiles sold by an agency for a certain car are equipped with diesel engines, let X represent the number of diesel models among the next 5 cars sold by this agency, write the probability distribution of X. MATH 553seven x 5seven math it costs$.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

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?

science
what is the chemical equation for sodium nitrate?

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