Saturday

March 28, 2015

March 28, 2015

Total # Posts: 743

**Statistics **

Long term experience showed that after a type of eye surgery, recovery time has a mean of u = 5.3 days in a hospital. A random sample of 40 patients, with this type of eye surgery, were treated as outpatients during recovery and the sample mean recovery time was 4.2 days. Does...
*March 25, 2012*

**Statistics**

The average annual salary of employees at Wintertime Sports was $28,750 last year. This year the company opened another store. Suppose a random sample of 18 employees had an average annual salary of $25,810 with standard deviation of s = $4230. Use a 1% level of significance ...
*March 25, 2012*

**Statistics**

How long does it take to have food delivered? A Chinese restaurant advertises that the mean delivery will be no more than 30` minutes. A random sample of delivery times is shown below. Based on this sample data, is the mean delivery time different than 30 minutes? Use a 5% ...
*March 25, 2012*

**Statistics**

A large furniture store has begun a new ad campaign on local television. Before the campaign, the long term mean daily sales were $24,819. A random sample of 40 days during the new ad campaign gave a sample mean daily sale of $25,910. Does this indicate that the population ...
*March 25, 2012*

**Statistics**

Computer Depot is a large store that sells and repairs computers. A random sample of 110 computer repair jobs took technicians an average of 93.2 minutes per computer. Assume that o is known to be 16.9 minutes. Find a 99% confidence interval for the population mean u for the ...
*March 25, 2012*

**Statistics**

Mr. Crandall has assigned a term paper due at the end of the semester. He would like to know the average length of the papers. The data below are the he numbers of types pages from a random sample of 10 term papers. Use these data to compute a 95% confidence interval for the ...
*March 25, 2012*

**Statistics**

A random sample of 14 evenings at the O'Sullivan house hold showed that the family received an average of 2.4 solicitation calls each evening. The sample standard deviation was s= 0.9. Find a 99% confidence interval for the population mean number of solicitation calls this...
*March 25, 2012*

**Statistics**

A study is being planned to estimate the mean number of semester hours taken by students at a college. The population standard deviation is assumed to be o=4.7 hours. How many students should be included in the sample to be 99% confident that the sample mean is within one ...
*March 25, 2012*

**math**

? I need help. I'm asking what it means to simplify :O
*March 22, 2012*

**math**

simplify. 1) 9 - 3 - 4 2) 9 + 1 +3 3) 6 + 1 + 3 4) 5 + 4 - 2 5) 6 - 5 + 2 6) 9 - 2 + 5
*March 22, 2012*

**chemistry**

If 73.5 g of liquid Br2 and 330 mL of 1.18 M aqueous NaI are reacted stoichiometrically according to the balanced equation, how many grams of liquid Br2 remain? Round your answer to 3 significant figures. 2NaI(aq) + Br2(l) → 2NaBr(aq) + I2(s)
*March 20, 2012*

**chemistry**

how many grams are in 49.0 mL of NaOH
*March 13, 2012*

**Calculus 1**

A rectangular field is enclosed by a fence and seperated into two parts by a fence parallel to one of the sides. If 600 m of fencing is available, what should the dimensions be so that the area is a maximum?
*March 8, 2012*

**history**

I agree its B
*March 7, 2012*

**geometry**

State a conclusion that seems reasonable. 6 + 0 = 6, 8 + 0 = 8, 9 + 0 = 9, 100 + 0 = 100. Conclusion:
*March 5, 2012*

**geometry**

There are six marbles in the bag and three of them are purple, three of them are black.
*March 5, 2012*

**Calculus**

dy/dx = 4xy^2 I need to find the integral of that. So I separate the variables and have 1/y^2 dy = 4x dx. Where do I go from here?
*March 2, 2012*

**Math**

8,16
*March 1, 2012*

**Chemistry**

I need to find the volume of 5.44 molar nitric acid needed to completely react with 6.27 grams of Ca(OH)2.
*February 29, 2012*

**L.A.**

Hi,we are learning about the african americans in america. What would an example of racism like with the white only signs should i do?
*February 28, 2012*

**math**

The hour hand is closer to the six
*February 28, 2012*

**math**

Hi,does anyone know the basics of adding fractions? For example 2/4+2/8=?
*February 28, 2012*

**World History**

The world became more advanced and sports became known.
*February 28, 2012*

**social studies**

Yes they were very famous but only the rich could afford them.Then slowly the price came down and they became outdated.
*February 28, 2012*

**english**

Like Ms.Sue said you need to understand adverbs.
*February 28, 2012*

**english**

The only adjective is Amazon and it's a proper adjective.
*February 28, 2012*

**4th grade**

8+4=12
*February 28, 2012*

**Grammer**

It is because a pronoun describes a noun.
*February 27, 2012*

**spell**

For the following items, mark the choice which is spelled incorrectly. Prolong Perpetuete Protract Continue
*February 26, 2012*

**math**

find the percent of decrease. round to the nearest tenth if necessary from 49 cm to 34 cm
*February 23, 2012*

**Engliish Lit-Please recheck**

I'm thinking it is a simile but couldn't it be a personification, also?
*February 16, 2012*

**Engliish Lit-Please check**

or could it be a simile when it states Nature like Liberty is but restrin'd
*February 16, 2012*

**Engliish Lit-Please check**

"Those RULES of old discover'd not devis'd Are nature still, but Nature Mehtodiz'd Nature, Like Liberty is but restrain'd By the same Laws which first herself ordain'd What is this an example of simile hyperbole analogy overstatement personification I...
*February 16, 2012*

**Math**

You want to know what her take-home pay is. 1/3 goes to rent, 1/8 goes for her car, 1/6 goes to her food, 1/24 goes towards insurance, and 1/16 of the money is for entertainment. 1/3x represents 1/3 of her unknown amount of take-home payment. 1/8x represents 1/8 of her unknown...
*February 15, 2012*

**7th grade math**

Multiply 11 by 7.5 which is 82.5. Next multiply 3.25 by 3.25. Now multiply 12 by 1056.25.
*February 14, 2012*

**math**

A tree casts a shadow that is 20 feet long. A 5-foot-tall boy stands in the shadow so that the end of his shadow lines up with that of the tree. His shadow is 6 feet long. How tall is the tree
*February 14, 2012*

**6th grade math**

You started with 30.
*February 13, 2012*

**Grade 6 Science**

If you rub your hair with a balloon, it will stick up.
*February 11, 2012*

**Civics**

How have legal codes change and what roles did philosophers play in the development of law in the United States? should moral codes play a role in society?
*February 9, 2012*

**Grade 6 LA**

Listen Sing Dance
*February 8, 2012*

**7th grade Lang. Art**

Tamper.
*February 8, 2012*

**math**

There are 36 chickens and dogs in the cage, with a total of 100 legs. How many chickens and dogs are there
*February 5, 2012*

**English 7 - Journal Entry Check**

It shouldn't be 'I done extra credit`` You should replace done with did.
*February 2, 2012*

**Reading**

It means angel.
*January 30, 2012*

**Biology**

I have a question and I'm not sure if my answer is correct? The heart is supplied with blood by: diffusion through heart wall right and left cardiac arteries arteries that branch directly from pulmonary arteries arteries that branch directly from aorta I know the heart ...
*January 30, 2012*

**us history**

"The Patriots won the Revolution in more ways than one." Explain that sentence. Be sure to think about non-military factors, as well as the obvious military ones.
*December 27, 2011*

**Physics**

To determine the work function of a material of a photodiode, you measuered the maximum Knetic energy of .5 eV correwsponding to a certain wavelength. Later on, you cut down the wavelength by 50% and found the maximum kinetic energy of the photoelectrons to be 3.8eV. From this...
*December 12, 2011*

**science**

umm yes i would like to know about normal fault please because im having a test on friday so can u give some information on normal faul please
*December 12, 2011*

**math**

Explain and show how you would estimate 0.5 x 4.62. Then justify why this is a good choice for arriving at the correct answer.
*December 8, 2011*

**geometry**

7. Verify that parallelogram ABCD with vertices A(–5, –1), B(–9, 6), C(–1, 5), and D(3, –2) is a rhombus by showing that it is a parallelogram with perpendicular diagonals.
*December 8, 2011*

**statistics help please**

The proportion of Canadians who eat breakfast regularly is 0.9. A simple random sample of 144 Canadians is taken. a. What is the probability that between 0.85 and 0.875 of the sample eat breakfast regularly? b. What is the probability that at least 0.945 of the sample eat ...
*December 4, 2011*

**statistics**

Women’s heights are normally distributed with a mean of 162 cm and standard deviation of 16 cm. a. Define an random variable, X, and describe its full distribution including the mean and variance. b. What percentage of heights are greater than 180 cm ? c. What height is ...
*December 4, 2011*

**Chemistry**

A pressure of 25.7inHg would be how many kilopascals? Can you do it step by step please. Thank you
*November 24, 2011*

**Physics**

The current in a very long, tightly wound solenoid with radius a and n turns per munit length varies in time according to the equation i(t)=Ct^2, where the current i is in amps and the time t is in seconds, and C is constant with appropriate units. Concentric with the solenoid...
*November 14, 2011*

**Physics**

A square conducting loop with sides of length L is rotation at a constant angular speed of, w (omega), in a uniform magnetic field of magnitude B. At time t=0, the loop is oriented so that the direction normal to the loop is aligned with the magnetic field. Find the expression...
*November 14, 2011*

**Physics**

A square conducting loop with sides of length L is rotation at a constant angular speed of, w (omega), in a uniform magnetic field of magnitude B. At time t=0, the loop is oriented so that the direction normal to the loop is aligned with the magnetic field. Find the expression...
*November 13, 2011*

**Physics**

The current in a very long, tightly wound solenoid with radius a and n turns per munit length varies in time according to the equation i(t)=Ct^2, where the current i is in amps and the time t is in seconds, and C is constant with appropriate units. Concentric with the solenoid...
*November 13, 2011*

**math**

SOLVE THE EQUATION BY USING EQUIVALENT FRACTIONS? 1. 12/21=X/7, What's X= 2. 12/16=6/Z, What's Z= 3. 4/14=20/Y, What's Y= 4. 16/14=8/Z, what's Z= PLEASE HELP ME!!!!!!!!!
*November 13, 2011*

**Physics**

A square conducting loop with sides of length L is rotation at a constant angular speed of, w (omega), in a uniform magnetic field of magnitude B. At time t=0, the loop is oriented so that the direction normal to the loop is aligned with the magnetic field. Find the expression...
*November 13, 2011*

**Physics**

A helicopter hovers above the north magnetic field pole in a magnetic filed of magnitude 0.5G perpendicular to the ground. The helicopter rotors are 10m long, are made of aluminum, and rotate about the hub with a rotational speed of 10 000 rpm. What is the potential difference...
*November 13, 2011*

**Physics**

The current in a very long, tightly wound solenoid with radius a and n turns per munit length varies in time according to the equation i(t)=Ct^2, where the current i is in amps and the time t is in seconds, and C is constant with appropriate units. Concentric with the solenoid...
*November 13, 2011*

**Physics**

A helicopter hovers above the north magnetic field pole in a magnetic filed of magnitude 0.5G perpendicular to the ground. The helicopter rotors are 10m long, are made of aluminum, and rotate about the hub with a rotational speed of 10 000 rpm. What is the potential difference...
*November 13, 2011*

**Physics**

A man 1.80 m tall walks at 2.00m/s perpendicular to a horizontal magnetic field of 5.0 T; that is, he walks between the pole faces of a very big magnet. Given that his body is full of conducting fluids, estimate the potential difference induced between his head and feet. I ...
*November 13, 2011*

**Physics**

A square conducting loop with sides of length L is rotation at a constant angular speed of, w (omega), in a uniform magnetic field of magnitude B. At time t=0, the loop is oriented so that the direction normal to the loop is aligned with the magnetic field. Find the expression...
*November 13, 2011*

**Physics**

The current in a very long, tightly wound solenoid with radius a and n turns per munit length varies in time according to the equation i(t)=Ct^2, where the current i is in amps and the time t is in seconds, and C is constant with appropriate units. Concentric with the solenoid...
*November 13, 2011*

**Physics**

So now I noticed that, if I multiply the number of turns to my previous answer, I get .24 V. But I don't know why that must be done.
*November 13, 2011*

**Physics**

A solenoid with 200 turns and a cross sectional area of 60 cm^2 has a magnetic field of .60 T along its axis. If the field is confined within the solenoid and changes at a rate of .20 T/s, the magnitude of the induced potential difference in the solenoid will be: a) .00020V b...
*November 13, 2011*

**7th Grade English**

done !
*November 11, 2011*

**physics**

my answer for these are 1. a 2.c 3 d but not sure so please anyone see if i am correct 1. In which of the following cases is work done on the object? A. Lifting an object off the floor. B. Pushing an object, but it does not move C. Carrying an object at a constant velocity D. ...
*November 6, 2011*

**physics**

A child runs down his driveway with an initial speed of 3.0 m/s for 4.5 s, and then uniformly decreases his speed to 0.0 m/s in 2.5 s. What is the boy’s acceleration during the second part of his motion?
*November 5, 2011*

**Math**

52.2600.
*October 26, 2011*

**chemistry**

what happens to energy released by an exothermic enthalpy change??
*October 18, 2011*

**Math**

my home work is hard because it say...The secret number has a 7 in the ones place the tens number is an odd number and i though it will be 87.
*October 18, 2011*

**Science **

thanks
*October 17, 2011*

**Science **

what kind of plants have life cycle that last several years?
*October 17, 2011*

**Science **

what type of plants that leave several years?
*October 17, 2011*

**Botany **

what kind of plants have life cycle that last several years?
*October 17, 2011*

**botany**

becaue they have seeds
*October 17, 2011*

**botany**

why are green algae classified as plants and noy proyists?
*October 17, 2011*

**chemistry**

The density of dry air measured at 25 degrees celsius is 1.19 x 10 to the negative 3 g/cm cubed. What is the volume of 50.0g of air?
*October 13, 2011*

**math**

303 & 55
*October 12, 2011*

**Math**

Salma invested her savings in two investment funds. The that she invested in Fund A returned a profit. The amount that she invested in Fund B returned a profit. How much did she invest in Fund B, if both funds together returned a profit?
*October 11, 2011*

**science**

A Kid applies a force of 70 Newtons to a ball over 1.1 meters.How much work did he do on the ball?
*October 11, 2011*

**French 2**

Complete the names of the dishes une omelette___fines herbes avec des frites et une salade une glace___chocolat
*September 28, 2011*

**maths**

the mean of a set of test scores is 64. a new student takes the same test and scores 80 marks. when his score is added to the other scores, the mean increases to 65. how many students sat for the test altogether?
*September 24, 2011*

**Sociological**

There are three primary sociological theries discussed in Chapter One of the text, Introduction to Sociology. Briefly summarize each theory and the major differences across the Functionalist, Conflict, and Symbolic Interaction perspective.
*September 23, 2011*

**math**

how do you find all the real zeros for this function f(x)=x^3+9x^2-4x-36
*September 21, 2011*

**chemistry**

How do the boiling points of 3.0 m C6H12O6 and 3.0 m CaCl2 compare? A. The boiling point of 3.0 m C6H12O6 is higher. B. The boiling point of 3.0 m CaCl2 is higher. C. They are the same. D. The difference cannot be determined from the information given. I think the answer is D...
*September 15, 2011*

**science**

A 63 kg boy and a 44 kg girl use an elastic rope while engaged in a tug-of-war on a frictionless icy surface. If the acceleration of the girl toward the boy is 1.7 m/s 2 , determine the magnitude of the acceleration of the boy toward the girl
*September 12, 2011*

**geometry**

Referring to this figure what is the difference in the meaning between the notaions QR( with a line over it) and QR?
*August 31, 2011*

**basic dressmaking processes**

1.A Correct 2.D Incorrect PAGES 1-2 3.B Incorrect PAGE 5 4.C Incorrect PAGE 8 5.A Correct 6.D Correct 7.C Incorrect PAGE 18 8.B Incorrect PAGE 32 9.C Incorrect PAGE 37 10.D Correct 11.C Incorrect PAGE 39 12.C Incorrect PAGE 44 13.A Correct 14.B Correct 15.D Correct 16.C ...
*August 30, 2011*

**physics**

I am having so much trouble with this D: A rocket is traveling straight up from its launch pad. An observer 5.00 km from the launch pad notices that at one instant, she must tilt her telescope 45.0 degrees upward to see the rocket. 10.0 seconds later, she must tilt her rocket ...
*August 25, 2011*

**8th Math**

How do I substract a whole number from a fraction ?!?!?!
*August 24, 2011*

**science**

A diesel engine's piston compresses 16 cm3 of fuel-air mixture into 1 cm3. The pressure changes from 1 atmosphere to 48 atmospheres. If the initial temperature of the gas was 305 K, what was the final temperature? Note: As long as the units for pressure and volume are the ...
*June 21, 2011*

**physics**

in the model ,how far away from the earth would the sun be?
*June 18, 2011*

**chemistry**

What volume does 627 cm3 of a gas at 14°C occupy at 40°C, if the pressure does not change?
*June 16, 2011*

**math**

ã2x+4=4
*May 25, 2011*

**math**

Solve the radical equation: √300 or ã300
*May 25, 2011*

**math**

Simplify: 5/8 divided by 15/16 + 1/2
*May 25, 2011*

**geometry**

How do you find the slope-intercept equation of medians of a triangle and perpendicular bisectors of a triangle?
*May 22, 2011*

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