Tuesday

September 27, 2016
Total # Posts: 1,289

**Physics **

An iron bolt of mass 70.0 g hangs from a string 31.3 cm long. The top end of the string is fixed. Without touching it, a magnet attracts the bolt so that it remains stationary, displaced horizontally 23.0 cm to the right from the previously vertical line of the string. a)find ...

*January 18, 2010*

**chemistry**

How many grams of NaCl do you have if you have 2.30 x 10 to the 23rd olecules of salt?

*January 12, 2010*

**Chemistry-Balancing Equations**

I need help balancing equations. _C7H60+_02->_C02+_H20 I don't know how to balance it because when i do it just won't work out ill have too much on one side and it just wouldn't work. i know im missing a rule or something.

*January 12, 2010*

**Chemistry**

How many grams of carbon dioxide are produced if you react 200g of benzaldehyde reacr with 32g of oxygen? its stoichiometry, i have no idea how to do this...

*January 12, 2010*

**Math**

1/5

*January 10, 2010*

**APUSH**

Asses the Validity of the fallowing statement: "Reconstruction failed to bring economic success to former slaves."

*January 4, 2010*

**geometry**

Find the complement of „£B.

*December 12, 2009*

**Math-Statistics**

For a standard normal curve, find the z-score that separates the bottom 90% from the top 10%.

*December 9, 2009*

**math-test statistic**

If we have a sample of 12 drawn from a normal population, then we would use as our test statistic A) z0 with 11 degrees of freedom B) t0 with 12 degrees of freedom C) z0 with 12 degrees of freedom D) t0 with 11 degrees of freedom

*December 5, 2009*

**math**

Is the rate 3/4 cup of butter /6eggs equal to the rate 9 cups of butter/73eggs

*November 24, 2009*

**math**

Find the best buy on cashews (1lb is 16oz), a) 1lb for $6.09 B. 10oz for $4.59 C. 1lb 4oz for $7.09 D. 12oz for $5.09

*November 24, 2009*

**CRT 205**

A(n)_____ is a set of claims intended to support or prove a conclusion.

*November 22, 2009*

**Chemistry**

I ran into the same issue, to me determining the KWH is simple, multiply current+Volts* hrs used and you will get KWH. But for some reason the answer that they have given is the energy requirement for a single reaction so here is how you figure it. kwh=(nfE)/(3.6e6 * ...

*November 18, 2009*

**statistics**

Health Care: Flu Based on data from the Statistical Abstract of the United States, 112th Edition, only about 14% of senior citizens (65 years old or older) get the flu each year. However, about 24% of people under 65 years old get the flu each year. The general population ...

*November 11, 2009*

**Math**

The Tao Inc. purchased an asset for $170,000 with a salvage value of $8,500 have a useful life of four years. Find the depreciation expense for the first year using the 150% declining balance method.

*November 10, 2009*

**math**

List two relationships that are true about pairs of sides or angles or diagonals in a. a parallelogram. b. a rectangle. c. a rhombus.

*October 30, 2009*

**math**

a. If you begin with a right triangle with sides a, b, and c and decrease the right angle so it is an acute angle, how does compare with ? b. Answer this question for the situation where you increase the right angle so that it is obtuse. I have to use a formula to show the ...

*October 30, 2009*

**math**

4x+10=

*October 30, 2009*

**5th grad math cubic units**

12

*October 26, 2009*

**math/graphing**

The number of accidents that occur at the intersection of Pine and Linden streets between 3 p.m. and 6 p.m. on Friday afternoons is 0, 1, 2, or 3, with probabilities of 0.84, 0.13, 0.02, and 0.01, respectively. Graph this probability distribution. What is the expected value ...

*October 22, 2009*

**probability**

Five numbers are to be picked, without repetition, from 44 numbers to determine the winner of the Fortune Five game in the state lottery. If the order of the numbers is insignificant, how many different ways can a winning quintuple be selected? What is the probability of winning?

*October 21, 2009*

**math/probability**

A jar contains four marbles, each a different color: red, blue, green, and yellow. If you draw two marbles from the jar, one after another, replacing the first before drawing the second, what is the probability of getting a. two red marbles? b. a red marble on the first draw ...

*October 21, 2009*

**math**

The mean systolic blood pressure of adult males is normally distributed with a mean of 138 (millimeters of mercury) and a standard deviation of 9.7. What percent of adult males have blood pressure between 161.28 and 164.9?

*October 21, 2009*

**math157**

The number of accidents that occur at the intersection of Pine and Linden streets between 3 p.m. and 6 p.m. on Friday afternoons is 0, 1, 2, or 3, with probabilities of 0.84, 0.13, 0.02, and 0.01, respectively. Graph this probability distribution. What is the expected value ...

*October 21, 2009*

**misconception?**

A student asks, “What’s wrong with the argument that the probability of rolling a double 6 in two rolls of a die is 1/3 because 1/6 + 1/6 = 1/3? ”Write an explanation of your understanding of the student’s misconception.

*October 21, 2009*

**probability**

Five numbers are to be picked, without repetition, from 44 numbers to determine the winner of the Fortune Five game in the state lottery. If the order of the numbers is insignificant, how many different ways can a winning quintuple be selected? What is the probability of winning?

*October 21, 2009*

**math fair**

How did you get $3.50?

*October 21, 2009*

**math fair**

The game of dots is played by rolling a fair die and receiving $1 for each dot showing on the top face of the die. What cost should be set for each roll if the game is to be considered a fair game?

*October 21, 2009*

**math**

The game of dots is played by rolling a fair die and receiving $1 for each dot showing on the top face of the die. What cost should be set for each roll if the game is to be considered a fair game?

*October 21, 2009*

**science**

What are examples of alternatives to natural resources? I know of vegetable oil to replace fuel, but what else? Thanks.

*October 20, 2009*

**Philosophy**

If this is the for the same class I am in you have to concentrate on the Philosophers mentioned in Chapter 8, this is the period after day 1850.

*October 4, 2009*

**Macroeconomics**

A) Suppose that as the economic recovery strengthened consumer expectations of annual inflation increased from 2% to 3.5 % and, at the same time, the expected real rate of return required to equate investor demand to the existing supply of 1 year Treasury notes increased from ...

*October 1, 2009*

**CHEMISTRY **

I dont understand 3a and 3b. I dont understand how you do that

*September 27, 2009*

**physics**

2.2

*September 26, 2009*

**algebra**

I have a word problem in my homework that confuses me. How long is 1 billion seconds simplified into years then months then days, etc. Years then months then days as in xx years xx months and xx days to count to 1 billion seconds. Just one answer not an answer each for years, ...

*September 24, 2009*

**space**

what is the science behind space

*September 22, 2009*

**Science **

hey there can someone please help me answer the question - Explain the advantages and disadvantages of DNA mutating Thankyou

*September 21, 2009*

**4th grade**

Go on a big number hunt.Find at least one number greater than 100,000.Findat least one number greater than a 1,000,000.Hint:look in a on-line .Record the number below and write at least 2 sentences to describe what each one is about? That's all the information I have.......

*September 16, 2009*

**4th grade**

find at least one number greater than100,000?find at least one number greater than 1,000,000

*September 16, 2009*

**Physics**

A dog that can swim at 1.0 m/s jumps in a river that is flowing 3.0 m/s at an angle of N60*E. Solve the resultant velocity vector of the dog if he heads north. What direction is the dog acutally heading? can someone please help thanks

*July 20, 2009*

**math**

thanks i got now the car cost 2.50

*July 2, 2009*

**math**

nevermine i can't how can u find b

*July 2, 2009*

**math**

yeah i can thanks

*July 2, 2009*

**math**

The total toll charge for 1 car and 5 bicycles to cross a bridge is $7.50. The toll for a car is $1.50 more than for a bicycle. Find the cost for a car to cross the bridge.

*July 2, 2009*

**Chemistry**

thank you sooo much

*July 2, 2009*

**Chemistry**

Liquid methanol (CH3OH) is combusted in oxygen gas to yield carbon dioxide gas and liquid water Okay I keep getting this: CH3OH(l) + 1.5 O2(g) > CO2(g) + 2 H2O(l) the website tells me I'm wrong, but I dont know how to go about with out using fractions. Please help. Thanks

*July 2, 2009*

**Math**

April buys eight books for $44. Paper back books cost $4 and hard back books cost $8. How many of each book did she buy?

*July 1, 2009*

**math**

E(t)=80.6t+81.0 and E(10)= 85.9 is what I came with which I guess you are saying that it is wrong thanks I will try to rework the problem

*June 30, 2009*

**math**

in 1994 the life expectancy of malews in a certain country was 70.9 years. In 1998 it was 73.6 years. Let E represent the life expectancy in year t and let t represent the number of years since 1994 The linear functionE(t) that fits the data is E(t)= 80.6t+81.0 Use the ...

*June 30, 2009*

**math**

find the slope and the y-intercept f(x)=-7x-2 the slope is -7 the y-intercept is(0,-2) is this correct?

*June 29, 2009*

**math**

solve -16<4x-5<-4 the solution is -11/4<x<1/4 is this correct?

*June 29, 2009*

**math**

use the distributive property to help you solve the equation 9(w-2)=45 w=7 is this correct?

*June 29, 2009*

**math**

solve using multiplication -6x>1/13 The solution is < -1/78 is this correct?

*June 29, 2009*

**math**

solve by substitution 7x+6y=7 x=58-9y What is the solution of the system? (7,-5) is this correct?

*June 29, 2009*

**math**

5/8x+1/16x=7/16+x the solution is x=-7/5 is this correct?

*June 29, 2009*

**math**

x+5y=3 (1) x=9-5y (2) What is the solution of the system? (-3,6/5) is this correct?

*June 29, 2009*

**math**

-0.4x<-16 the solution is{x>40} is this correct?

*June 29, 2009*

**math**

Thank you so much

*June 29, 2009*

**math**

8x-(2x+5)=19 The solution is x=4 is this correct?

*June 29, 2009*

**math**

soybean meal is 18% protein; cornmeal is 9% protein. how many pounds of each should be mixed together in order to get 360-lb mixture that is 14% How many pounds of cornmeal should be in the mixture? 200 how many lbs of soybean meal should be in the mixture? 160 can someone ...

*June 29, 2009*

**math**

1. Suppose you are in the market for a new home and are interested in a new housing community under construction in a different city. a) The sales representative informs you that there are two floor plans still available, and that there are a total of 56 houses available. Use ...

*June 27, 2009*

**math**

I need someone to review this and see if it is correct please 1. Suppose you are in the market for a new home and are interested in a new housing community under construction in a different city. a) The sales representative informs you that there are two floor plans still ...

*June 27, 2009*

**Recycling Speech**

Can you help me write a recycling speech?

*June 18, 2009*

**Math Statistics**

what was the answer you finally got

*June 6, 2009*

**physics**

heyy thats right its in the physics book page 337 the answer is in the back of the book lol good job i need to learn how to do it lol :P

*June 3, 2009*

**economics**

What are the effects of the economic crisis on our society?

*May 26, 2009*

**science assignment**

what imapct has technology had on our society

*May 25, 2009*

**MATH TRIG**

FROM A DISTANCE OF 80 M. THE ANGLE OF ELEVATION OF THE TOP OF A FLAGPOLE IS 18 DEGREES. dETERMINE THE HEIGHT OF THE FLAGPOLE.(NEAREST TETH OF A M. mY CONFUSION IS ANGLE OF DEPRESSION AND ANGLE OF ELEVATION. mY TECHER CALLS FROM TOP ELEVATION WHILE i INSIST ELEVATION IS FROM ...

*May 13, 2009*

**Chemistry**

What is the molar solubility of PbCl2 in a solution of 0.23 M CaCl2? Ksp = 1.6 10-5 for PbCl2. idk how to do this because of the Cl2

*May 11, 2009*

**Biology**

Recent studies of children and juveniles of other species show that when their eyeballs are actively growing, frequent exposure to blurred images can permanently alter the shape of the eyeball. The blurring results when objects in the field of view are at various distances and...

*May 7, 2009*

**Biology**

Researchers in Africa found that a very high proportion of Masai, who routinely drink large quantities of milk, develop an amoebic infection after being given an iron supplement. Explain the role of lactoferrin in a diet and explain why the Masai get this problem and why Zulu ...

*May 7, 2009*

**Biology**

In 1999, Beverly Strassman published a study of menstrual cycling among the Dogon women in Mali. What did she find? Using her study results, what methods can you suggest reducing breast cancer in North American women who will have no children or very few children?

*May 7, 2009*

**Biology**

In the early 1900s, Julius Wagner-Jauregg noted that syphilis was rare in areas where malaria was common. Describe the experiment he did. What prize did he win in 1927 as a result of this experiment? Considering the ethical implications of his study, would he get the same ...

*May 7, 2009*

**Biology**

Haemophilia is a sex-linked recessive trait. A son born to phenotypically normal parents has Klinefelter syndrome and hemophilia. In which meiotic division of which parent is non-disjunction of the X chromosome most likely to have occurred? Explain with diagrams and state your...

*May 7, 2009*

**Biology**

In Drosophila, a cross was made between a female heterozygous for the recessive genes ct (cut wings) and se (sepia-coloured eyes) and a sepia male. Among their female progeny, half the phenotypes were wild-type and half sepia. Among their male progeny were 1/4 wild-type, 1/4 ...

*May 7, 2009*

**Biology**

At what time (be very specific) is the consumption of Thalidomide dangerous to pregnant women? What exactly goes wrong to produce phocomelia children?

*May 7, 2009*

**Biology**

In most Hymenoptera, all fertilized eggs develop into diploid females and all unfertilized eggs into haploid males-a condition known as haplodiploidy. Workers in these colonies share half the alleles they received from their mother, but share all of the alleles they received ...

*May 7, 2009*

**Economics.**

1 – One of the reasons that the U.S. Government started the Federal Reserve system was to: A – keep the banking power of the U.S. spread out among various districts. B – make sure that the U.S. banks were obeying laws regarding banking. C – have a place for...

*May 6, 2009*

**Economics.**

The buying and selling of government securities to alter the supply of money are: A. a painful necessity. B. Open market operations. C. equalizing the required reserve ration. D. tight money policies. I’m thinking its B.

*May 6, 2009*

**geometry**

how can you justify a shape

*May 4, 2009*

**Pre Cal.**

So I posted these...but no one answered them. Are they right? Solve 4sin^2 x + 4sqrt(2) cos x-6 = 0 for all real values of x. My answer: (pi/4)+2(pi)k, (7pi/4) + 2(pi)k Solve 2cos^2 x-5cosx+2=0 for principal values of x. My answer: 60 and 300 degrees

*April 29, 2009*

**Advanced Math**

Can someone check these for me? Please? Use half-angle identity to find the exact value of cos165 degrees. (-1/2) sqrt(2+sqrt(3)) Write the equation 2x+3y-5=0 in normal form. (-2sqrt(13)/13)x- (3sqrt(13)/13)y+ (5 sqrt (13)/13) = 0 Find the distance between the lines with ...

*April 28, 2009*

**Advanced Math**

Solve 4sin^2 x + 4sqrt(2) cos x-6 = 0 for all real values of x. My answer: (pi/4)+2(pi)k, (7pi/4) + 2(pi)k Solve 2cos^2 x-5cosx+2=0 for principal values of x. My answer: 60 and 300 degrees.

*April 28, 2009*

**religion**

I need to find the Historical figures and events, Central beliefs Nature of God, Texts, Ritual and practice (sacred elements & their meaning,) Ethics and morality for Hinduism

*April 23, 2009*

**religion**

Hinduism,Historical figures and events, Central beliefs Nature of God, Texts, Ritual and practice (sacred elements & their meaning,) Ethics and morality

*April 23, 2009*

**Government**

Laws that treat men and women differently: A. are always constitutional. B. are always unconstitutional. C. may be upheld by the Supreme Court if the meet certain criteria. D. may be passed by Congress, but not the states. My book says absolutely nothing about this, but I was ...

*April 22, 2009*

**chemistry**

Or would the bis(trichloromethyl) carbonate(triphosgene) react with itself to form the CO2

*April 21, 2009*

**chemistry**

How would CO2 form from the reaction of 3-methyl benzoic acid with bis(trichloromethyl) carbonate (triphosgene)? Is it possible to form CO2 from a mixture of dichloro ketone in heat?

*April 21, 2009*

**algebra**

i need help with these kind of problems 3x(3x + 5)(10x+2)

*April 20, 2009*

**Chemistry**

How would you scale down an organic chemistry experiment? Would you have to know an expected percent yield to scale it down?

*April 14, 2009*

**pre cal--check**

Name all the values of x that are not in the domain of f(x) = (2–x^2)/ (x+ 5) I got only x= -5 because that's the only value that would make the denominator zero.

*March 31, 2009*

**college**

Business Communications

*March 24, 2009*

**college**

Request for sample letters containing bad news messages. Need a few realy quick

*March 24, 2009*

**calculus**

26. A train is heading due west from St. Louis. At noon, a plane flying horizontally due north at a fixed altitude of 4 miles passes directly over the train. When the train has traveled another mile, it is going 80 mph, and the plane has traveled another 5 miles and is going ...

*March 16, 2009*

**Chemistry**

Thanks for the push in the right direction, I found the standard reduction potentials. Ag+ --- +0.799 H2 --- 0.0 H+ --- -0.83 Cl2 --- +1.359 Al3+ --- -1.66 I chose Cl2 as the strongest oxidizing agent. Please tell me this is correct.

*March 10, 2009*

**Chemistry**

Which of the following species is the strongest oxidizing agent under standard state conditions? a. Ag+(aq) b. H2(g) c. H+(aq) d. Cl2(g) e. Al3+(aq) I think Ag+(aq) will transfer electons sooner than the other four choices. BECAUSE: H2 will hold on it its elcctrons because the...

*March 10, 2009*

**Chemistry**

Which of the following species is the strongest oxidizing agent under standard state conditions? a. Ag+(aq) b. H2(g) c. H+(aq) d. Cl2(g) e. Al3+(aq) An oxidizing agent is a substance that gains electrons in a redox chemical reaction. I think Al3+ has a very high electron ...

*March 10, 2009*

**chemistry**

In the following half equation, which is the oxidizing agent? NO3–(aq) + 4H+(aq) + 3e– <--> NO(g) + 2H2O a. NO3– b. H+ c. e– d. NO e. H2O An oxidizing agent is a chemical compound that readily transfers oxygen atoms, or is a substance that gains ...

*March 10, 2009*

**chemistry**

In the following half equation, which is the oxidizing agent? NO3–(aq) + 4H+(aq) + 3e– <--> NO(g) + 2H2O a. NO3– b. H+ c. e– d. NO e. H2O An oxidizing agent is a chemical compound that readily transfers oxygen atoms, or is a substance that gains ...

*March 10, 2009*

**math 7th grade**

A coin is tossed. If a head appears, a spinner that can land on any of the numbers from 1 to 5 is spun. If a tail appears, the coin is tossed a second time instead of spinning the spinner. What are the possible outcomes? A. (T,H)(T,T)(T,1)(T,2)(T,3)(T,4)(T,5) B. (T,H)(H,H)(T,1...

*March 8, 2009*