Friday

August 28, 2015
Total # Posts: 52

**Math (Finite)**

A thief is faced with a combination lock with five wheels. Each wheel has the digits 0 to 9. The correct sequence of 5 digits needed to open the lock has no repeated digits. What is the probability that the thief will guess the correct sequence on the first try?
*June 11, 2015*

**Chemistry (please Help!!)**

determine which experiences a lower effective nuclear charge. using words and/ or drawings explain why. A) an electron in a 2s or an electron in a 2p B) a valence electron on sulfure or a vance electron on silicon C) a valence electron on chlorine or a valence electron on ...
*April 13, 2015*

**mania**

Amita decides that she wants the molds to have a square base from originally having a rectangular prism with a volume of 28 cubic centimeters - how many possible molds can she use
*March 31, 2015*

**math**

9000
*October 15, 2014*

**math**

maria runs 7 miles in 80 minutes. At the same rate, how many miles would she run in 64 minutes
*June 17, 2014*

**science**

what is the difference between erosion transport and deposition????????????????????
*June 15, 2014*

**Science**

ms.sue but I need to define the land formations
*June 14, 2014*

**Science**

P.S NUMBER THEM
*June 14, 2014*

**Science**

I REALLY REALLY NEED HELP SO 1.I need to do an essay asking you (me)to explain what is the difference between erosion,transport,and deposition?... 2.another essay asking me to explain you (me) to explain the destructive and positive effects of a volcanic erupyion?... 3.a short...
*June 14, 2014*

**chem**

What is the molar mass of hydrogen?
*May 12, 2014*

**Physic **

Two volleyballs, each of mass 0.300 kg, are charged by an electrostatic generator. each is attached to an identical string and suspended from the same point, as shown in Fiq.2. They repel each other and hang with separation 50.0 cm. The length of the string from the point of ...
*January 27, 2014*

**litreture**

Thank you alot Michel your answer helped me. English is my third language because of that I didn't understand the question deeply. your explaination made it very clear. Thank you :)
*December 11, 2013*

**litreture**

What are the main paradoxes of the last leaf story by O.Henry?
*December 11, 2013*

**geometry**

at a distance of 20m from a building, a person who is 3 m tall looks up at an angle of 25 degrees to see the top of the building. how tall is the building to the nearest meter?
*May 21, 2013*

**chemistry**

a solution (S) is prepared by dissolving 50.0 g calcium chloride in 250 ml volumetric flask wich is then filled with distilled water up to the line mark. calculate the molar concentration of solution (S)
*March 10, 2013*

**chemistry**

Which of the following statements is /are true? Answer a. None of he above. b. Impurities in a solvent raise the freezing point of that solvent c. All of the above d. Non-volatile impurities lower the boiling point of a solvent e. Ions lower the vapor pressure of a solvent ...
*February 28, 2013*

**Probability-Math**

Please forgive me for posting this for the 3rd time but I really need to learn this: A researcher conducted a study of the access speed of 45 hard drives and concluded that his maximum error of estimate was 28. If he were to conduct a second study to reduce the maximum error ...
*January 12, 2013*

**Statistics & Probability**

A researcher conducted a study of the access speed of 45 hard drives and concluded that his maximum error of estimate was 28. If he were to conduct a second study to reduce the maximum error of estimate to 7, about how many hard drives should he include in his new sample? ...
*January 11, 2013*

**Statistics & Probability**

A researcher conducted a study of the access speed of 45 hard drives and concluded that his maximum error of estimate was 28. If he were to conduct a second study to reduce the maximum error of estimate to 7, about how many hard drives should he include in his new sample? ...
*January 11, 2013*

**Probability**

If X is a normal random variable with mean 11, and if the probability that X is less than 12.10 is .72 , then what is the standard deviation of X? Select one: a. 3.00 b. 6.25 c. 2.50 d. 1.25 Please note that the answer for the above is stated as c.2.50. However, my answer ...
*January 4, 2013*

**Statistics & Probability**

Thank you!
*January 4, 2013*

**Statistics & Probability**

If X is a normal random variable with mean 11, and if the probability that X is less than 12.10 is .72 , then what is the standard deviation of X? Select one: a. 3.00 b. 6.25 c. 2.50 d. 1.25 Please note that the answer for the above is stated as c.2.50. However, my answer ...
*January 4, 2013*

**Statistics**

Please can some one help me with the following: A fisherman finds that approximately 17% of all his fish go bad by the time he takes them to the market. The fisherman catches 1,000 fish. A. How many will go bad by the time he takes them to the market? B. Find the standard ...
*December 26, 2012*

**Statistics**

Please can some one help me with the following: A fisherman finds that approximately 17% of all his fish go bad by the time he takes them to the market. The fisherman catches 1,000 fish. A. How many will go bad by the time he takes them to the market? B. Find the standard ...
*December 25, 2012*

**calculus**

thnks Reiny.
*December 16, 2012*

**calculus**

just plug pi/4 right
*December 16, 2012*

**calculus**

-4/64 why 64 not 8
*December 16, 2012*

**calculus**

just tel me how to setup
*December 16, 2012*

**calculus**

*find the slope of y= 4/x +6 at the point (8,2) *evaluate the derivative at the point (pi,4) y=[tan(5x^8)]^3 please help
*December 16, 2012*

**physics**

A small ball with a mass of 30.0 g and a charge of −0.200 μC is suspended from the ceiling by a string. The ball hangs at a distance of 5.00 cm above an insulating floor. If a second small ball with a mass of 50.0 g and a charge of 0.400 μC is rolled directly ...
*September 17, 2012*

**science**

A small ball with a mass of 30.0 g and a charge of −0.200 μC is suspended from the ceiling by a string. The ball hangs at a distance of 5.00 cm above an insulating floor. If a second small ball with a mass of 50.0 g and a charge of 0.400 μC is rolled directly ...
*September 17, 2012*

**health**

it's C
*August 14, 2012*

**queue **

Amanda Fall is starting up a new house painting business, Fall Colors. She has been advertising in the local newspaper for several months. Based on inquiries and informal surveys of the local housing market, she anticipates that she will get painting jobs at the rate of four ...
*May 20, 2012*

**queu **

The Waterfall Buffet in the lower level of the National Art Gallery serves food cafeteria-style daily to visitors and employees. The buffet is self-service. From 7:00 A.M. to 9:00 A.M. customers arrive at the buffet at a rate of 10 per minute; from 9:00 A.M. to noon, at 4 per ...
*May 20, 2012*

**linear programming**

Globex Investment Capital Corporation owns six companies that have the following estimated returns (in millions of dollars) if sold in 1 of the next 3 years: Year Sold (estimated return, $1,000,000s) Company 1 2 3 1 $14 $18 $23 2 9 11 15 3 18 23 27 4 16 21 25 5 12 16 22 6 21 ...
*May 20, 2012*

**linear programming**

Exeter Mines produces iron ore at four different mines; however, the ores extracted at each mine are different in their iron content. Mine 1 produces magnetite ore, which has a 70% iron content; mine 2 produces limonite ore, which has a 60% iron content; mine 3 produces pyrite...
*May 20, 2012*

**Math-Algebra**

What Is 9/10 As A Whole Number?=D
*April 17, 2012*

**Number operations/math**

Bill is selling funnel cakes at the county fair. After lunch, he has 2/3 of his original funnel cakes remaining. That evening, when the fair closes, he determines he sold 5/8 of the reaming funnel cakes. What expression can be used to find the fraction of the original funnel ...
*December 22, 2011*

**Calculus**

Given that y=x^(5/2)- x^(-1/2) . a) Find the coordinates where the tangent line is parallel to the line y-4x-4=0. b) Find the coordinates where the tangent line is perpendicular to the line 2y-3x-12=0.
*October 17, 2011*

**chem**

(CH3)N2H2(l) + 2N204(g) = 3N2(g) + 4H2O(l) + 2CO2(g). consider the reaction b2n 150g of liquid (CH3)N2H2 & 80L of N2O4 at 27 degree celcius & a pressure of 2 atm. The gases produced are collected at 27 degree celsius in an evacuated 250L. Calculate: a) Partial pressure of ...
*September 8, 2011*

**literature**

If you consider The Call of the Wild to be an allegory, which one of the following statements would be true? A. Judge Miller represents the primordial condition. B. Buck represents some characteristic of humanity. C. John Thornton represents the civilized world. D. The book is...
*September 22, 2010*

**math**

).Find all numbers for which the rational expression is undefined. (4)/(v-2) 2).Find the lcm of (6+7u), (36-49^(u^2)),and(6-7u) ? 3). The speed of train a is 14 mph slower than the speed of train b. Train a travels 190 miles in the same time it takes train b to travel 260 ...
*May 29, 2010*

**WRITING SKILLS **

Which of the following is the best opening sentence for a business letter that you want to sound fairly informal? A. I am in receipt of your order of February 10. B. This letter is to make you cognizant of our receipt of your order. C. Your order of February 10 arrived in our...
*February 13, 2010*

**E.L.A**

a cool title for the dust bowl
*January 10, 2010*

**ELA**

I know where to get the facts from,but I want to know what should I write in my reaserach on the Dustbowl (Remember 6th grade) thx
*January 9, 2010*

**ELA**

I still dont understand what to write about is there any 6th grade website for this???
*January 9, 2010*

**ELA**

What should I include in my Dust Bowl Reaserch???????
*January 9, 2010*

**Social Studies**

What should I put the title for the making of silk? (creative title) plz !!!!!
*December 30, 2009*

**Social Studies**

How is silk mage?What are the procedures? Also could there be an diagram for this ?
*December 29, 2009*

**Social Studies**

If you are writing a report on Ancient Egypt's Geograpy and the Nile Valley what do you write about?
*December 13, 2009*

**bio "plasma membrane"**

When a plasma membrane has a pressure of zero, passive transport STOPS IS THAT TRUE OR FALSE? I'M NOT TOO SURE.
*November 27, 2007*

**3rd grade math**

My daughter brought home this question: How does knowing 28=30-2 help you find 13+28? Any ideas?
*September 27, 2007*

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