Saturday

April 25, 2015

April 25, 2015

**Probability and Statistics**

The ACT scores of applicants to college are approximately normally distributed with a mean of 20.3 and a standard deviation of 3.1. If a random sample of 20 applicants to college is chosen find the probability that their average ACT score will be 19 and 21.
*Sunday, April 29, 2012 at 8:09pm*

**@elena**

thank you so much help with the problem. i have trouble solving part b of the problem you helped me with. it told me to give it as a percentage, I got 10% but it is wrong. can you please help me Superman must stop a 190-km/h train in 180m to keep it from hitting a stalled car ...
*Sunday, April 29, 2012 at 5:50pm*

**college physics**

Superman must stop a 190-km/h train in 180m to keep it from hitting a stalled car on the tracks. part a)If the train's mass is 3.8×10^5kg , how much force must he exert (find the magnitude)? part b)Compare to the weight of the train (give as %). partc) How much force...
*Sunday, April 29, 2012 at 4:59pm*

**College Chem**

if the pH of rain water is 5.6 on average what is the concentration of carbonic acid in rain water?
*Thursday, April 26, 2012 at 11:09pm*

**english**

write the dependent clause and the subordinate conjunction 1)( If)sub (you want to play the piano better),dep you have to practice.( 2(-I plan to study)dep ( until) sub I finish . 3-Justin saved his money (in order that)sub( he could go to college) dep. 4-( When)sub ( Lisa ...
*Thursday, April 26, 2012 at 9:03pm*

**English Grade 11 College**

I have trouble understanding of this article and how to answer the questions given. I just started new to school in Toronto; I was living in Turkey for Years So I do please to take your time to look and examine my homework. I greatly appreciate your patience and time and ...
*Thursday, April 26, 2012 at 8:54pm*

**College math**

1.Find the height to the nearest foot of a tree that makes a 50-foot shadow when a 2 ft. 6 in. pole is used to make a shadow of 3 feet.
*Thursday, April 26, 2012 at 8:51pm*

**Intermediate Algebra (college)**

Use the properties of logarithms to condense the expression 1/3[ln(x - 6)- 4 ln y - 2 ln z]
*Thursday, April 26, 2012 at 8:28pm*

**english**

write the dependent clause and the subordinate conjunction 1) If you want to play the piano better (depend),you have to practrice.(subordinate) 2) Justin saved his money (dep) inorder that he could go to college. (sub)
*Thursday, April 26, 2012 at 7:47pm*

** COLLEGE ALGEBRA**

THE PRIMETER OF SOME TRAFFIC SIGN MUST BE 78INCHES ALSO ITS LENGTH IS 7INCHES LONGER THAN ITS WIDTH FIND THE DIMENSIONS OF THE SIGN WHAT IS THE LENGTH WHAT IS THE WIDTH
*Wednesday, April 25, 2012 at 9:55pm*

**English Helppppp**

a persuasive argument that will promt your college to offer a summer block of cources that deal exclusively with current trends in the career field in which you are pursuing a degree, or in a field in which you have a keen interest. ok i plan to write about fashion designing ...
*Wednesday, April 25, 2012 at 8:36pm*

**College Chemistry**

I need help with this question!! a sample of pure KHP weighing .8097g dissolved in water and titrated with 40.25 mL of NaOH solution. The same NaOH solution was used to titrate a solution of a weak diprotic acid H2X. A sample of 0.18694g of the weak acid was first dissolved in...
*Wednesday, April 25, 2012 at 7:43pm*

**College Algebra**

bank a is lending money at 5.7% interest compounded annually. The rate at bank b is 5.6% compounded monthly, and the rate at bank C is 5.65% compounded quarterly. Which bank will you pay the least interest?
*Wednesday, April 25, 2012 at 12:34pm*

**College Accounting**

How do the entries affect account balances and why both debit and credit entries can increase or decrease an account balance?
*Tuesday, April 24, 2012 at 10:09pm*

**algebra college level **

it says y=-16x+181 represents number of students in class where x represents number of hours study required weekly. what is rate of change of number of students in class to number of hours study
*Tuesday, April 24, 2012 at 2:47am*

**business Maths**

Leslie Hart borrowed $15,900 to pay for her child’s education at Riverside Community College. Leslie must repay the loan at the end of 6 months in one payment with interest. (a) How much interest must Leslie pay? (Do not round intermediate calculation. Round your answer ...
*Monday, April 23, 2012 at 10:12pm*

**Health**

Jennifer is fifty-four. Her husband Brian died suddenly in a care crash. Not only was she emotionally distraught, but she found herself in serious financial turmoil. Brian had handled the finances (at least she had thought he had) throughout their 21 year marriage. Upon his ...
*Sunday, April 22, 2012 at 11:51pm*

**College Majors?**

I am a senior rapidly approaching the end of my high school education. Of course college is on my rader. I plan to go to double-major in journalism and art. I want to get my bachelor's degree in journalism so I can become an editor. I can work this job from home while ...
*Sunday, April 22, 2012 at 8:39pm*

**Writing - application essay**

I am writing an application essay to try and get accepted into Haywood Early College. I am writing four paragraphs and I already have 2 paragraph topics. I guess what I am trying to ask is could I possibly get help with 2 more topics?
*Sunday, April 22, 2012 at 1:42pm*

**College**

An electron enters the region of a uniform electric field, with v1=3*10^6 m/s and E=200N/C. The horizontal length of the plates is 0.100m 1. Fine the acceleration of the electron while in the field. 2. If the electron enters the field at a time t=0, find the time at which it ...
*Sunday, April 22, 2012 at 9:26am*

**Statistics**

A newspaper article stated that college students at a local university spent an average of $95 on beer a year. A student investigator who believed the average stated was too high polled a random sample of 50 students and found a mean of $92.25 and s = 10 Use these results to ...
*Saturday, April 21, 2012 at 5:13pm*

**College Algebra**

log5 (x+2)+log5(x-2)=3
*Friday, April 20, 2012 at 8:07pm*

**College Algebra**

log(x+10)=1+log(4x-3)
*Friday, April 20, 2012 at 8:06pm*

**College Algebra**

ln(8x+3)=ln11
*Friday, April 20, 2012 at 8:05pm*

**College Algebra**

Solve the equation. If necessary, round to the nearest thousandth. 5(2x-1)=10
*Friday, April 20, 2012 at 7:57pm*

**MATH##$$&&^^****

A researcher wishes to estimate the proportion of college students who cheat on exams. A poll of 490 college students showed that 33% of them had, or intended to, cheat on examinations. Find the margin of error for the 95% confidence interval.
*Friday, April 20, 2012 at 5:44pm*

**economics**

Over the last 30 years in the United States, the realprice of a college education (i.e., after adjusting for inflation) has increased by almost 70 percent. Over the same period, an increasing number of high school grad- uates have sought a college education. (Nationwide ...
*Friday, April 20, 2012 at 4:59pm*

**Statistics**

12. The proportion of students who own a cell phone on college campuses across the country has increased tremendously over the past few years. It is estimated that approximately 94% of students now own a cell phone. Twenty five students are to be selected at random from a ...
*Thursday, April 19, 2012 at 12:00pm*

**College General Biology**

A man who is a non-tongue roller (t) marries a woman tongue roller (T) whose father was a non-tongue roller (t) - what would the expected genotype and phenotype percentage for their offspring?
*Wednesday, April 18, 2012 at 2:01pm*

**college physics**

When a projectile lands, the angle made between the projectile and the ground corresponds to which of the following aspects of its motion? a)the direction of the acceleration vector just before impact b)direction of the velocity vector just before impact c)direction of the ...
*Wednesday, April 18, 2012 at 4:55am*

**college physics**

When a projectile lands, the angle made between the projectile and the ground corresponds to which of the following aspects of its motion? a)the direction of the acceleration vector just before impact b)direction of the velocity vector just before impact c)direction of the ...
*Wednesday, April 18, 2012 at 1:08am*

**college physics**

Consider a projectile that is thrown upward at an angle between 10 and 80 degrees from the horizontal, when are the acceleration and velocity vectors perpendicular to each other? (Only consider the motion during free fall.) a) nowhere b)at the highest point c)the launch point ...
*Wednesday, April 18, 2012 at 1:03am*

**College Chemistry**

Now the reaction (2NO+2H2==> 2H20+N2) is believed to take place in three steps, the first of which is the fast reversible dimerization of NO to form N2O2, and the last of which (again fast) is the reaction N20 + H2 --> N2 + H2O. So, what is the slow (second) step? Then ...
*Tuesday, April 17, 2012 at 11:54pm*

**college Calculus Help!**

If f(x)= ∫(21,x) t^5 dt then f'(x). my answer was 1/6 (21^6-x^6) it said it's wrong.
*Tuesday, April 17, 2012 at 3:07pm*

**COLLEGE CALCULUS. HELP!**

the fundamental theorem of calculus, f(x)=∫(0,x) t^3+2t^2+ 2 dt, and find f"(x). my answer was: f'(x)=x^3+x^2 f"(x)=3x^2+2x it said its wrong. i dont know how solve with interval, ∫(0,x)
*Tuesday, April 17, 2012 at 2:36pm*

**College Physics**

A 30.0 m steel wire and a 22.0 m copper wire, both with 1.00 mm diameters, are connected end to end and stretched to a tension of 170 N. How long does it take a transverse wave to travel the entire length of the two wires? (Take the mass per unit length of the wires to be 7....
*Monday, April 16, 2012 at 7:21pm*

**College Algebra**

The number of Mosquitoes M9x), in millions, in a certain area depends on the June rainfall x, in inches:M(x)=19x-x^2. What rainfall produces the maximum number of mosquitos?
*Monday, April 16, 2012 at 6:12pm*

**college chemistry**

Followed by the total volume. Calculate the molarity of this solution: 0.521 mol NaCl;125 mL
*Monday, April 16, 2012 at 5:55pm*

**College Chemistry**

A sample of an iron alloy contains 92.1g Fe, 2.59g C, and 1.59g Cr. Calculate the percent by mass of each component present in the alloy sample.
*Monday, April 16, 2012 at 5:09pm*

**Math**

Nico was stunned when he opened the mail. Here was a check for $322.50! This was the interest he earned on his investment. One year ago Nico had been given $5,000. His parents made him put it in the bank and save it for college, but they said he could keep the interest it ...
*Monday, April 16, 2012 at 4:40pm*

**college algebra**

a cub measures n inches on each edge. If a slice 1 inch thick is cut from one face of the cube and then a slice 3 inches thick is cut from another face of the cube, the resulting solid has a volume of 1560 cubic inches. Find the dimensions of the original cube.
*Monday, April 16, 2012 at 2:45pm*

**college algebra**

A propane tank has the shape of a circular cylinder with a hemisphere at each end. The cylinder is 6 feet long and volume of the tank is 5pie cubic feet. Find, to the nearest thousandth of a foot the length of the radius x.
*Monday, April 16, 2012 at 2:38pm*

**College Math**

Consider the following expression. 3(x-2)-9(x^+7x+4)-5(x+8)
*Monday, April 16, 2012 at 2:31pm*

**College Math**

The "learning curve" describes the rate at which a person learns certain tasks. If a person sets a goal of typing N words per minute (wpm), the length of time t (in days) to achieve this goal is given by the following formula. t=62.5ln(1-N/80) (a) According to this ...
*Monday, April 16, 2012 at 2:19pm*

**College Math**

A seismograph 300 km from the epicenter of an earthquake recorded a maximum amplitude of 5.3 102 µm. Find this earthquake's magnitude on the Richter scale. (Round your answer to the nearest tenth.)
*Monday, April 16, 2012 at 2:16pm*

**College Math**

An artifact was found and tested for its carbon-14 content. If 88% of the original carbon-14 was still present, what is its probable age (to the nearest 100 years)? Use that carbon-14 has a half-life of 5,730 years.
*Monday, April 16, 2012 at 2:14pm*

**college chemistry**

Lithium metal decomposes in water and releases hydrogen gas. if 275 ml of hydrogen gas is produced at stp. what is the mass of lithium that reacted ? Li(s)+H2O(l)=LiOH(aq)+H2(g)
*Sunday, April 15, 2012 at 10:59pm*

**College Chem 1010**

Which of the following compounds is insoluble? Question 4 options: A) Ca(NO3)2 B) FePO4 C) NH4OH D) Na2SO4 E) NaCl
*Sunday, April 15, 2012 at 10:48pm*

**Reposting Chemistry College**

Based on the balanced equation 4Na + O2 → 2Na2O calculate the number of Na2O formula units formed when 60 Na atoms and 10 O2 molecules react? Thanks.
*Sunday, April 15, 2012 at 8:34pm*

**College Chem**

Based on the balanced equation 4Na + O2 → 2Na2O calculate the number of Na2O formula units formed when 60 Na atoms and 10 O2 molecules react? Thanks.
*Sunday, April 15, 2012 at 7:34pm*

**college chemistry**

The solvay process in an industrial method for preparing baking soda. In the process, CO2, NH3, H2O, and NaCl react to produce NaHCO3. If 25.0 L of carbon dioxide gas at STP and 20.0 L of ammonia gas at STP react in excess water and salt, what is the mass of baking soda ...
*Sunday, April 15, 2012 at 6:18pm*

**physics - college **

An unmarked police car traveling a constant 95km/h is passed by a speeder traveling 14km/h .Precisely 2.50s after the speeder passes, the police officer steps on the accelerator; if the police car's acceleration is 2.30m/s^2 , how much time passes before the police car ...
*Sunday, April 15, 2012 at 5:50pm*

**physics - college **

An unmarked police car traveling a constant 95km/h is passed by a speeder traveling 14km/h .Precisely 2.50s after the speeder passes, the police officer steps on the accelerator; if the police car's acceleration is 2.30m/s^2 , how much time passes before the police car ...
*Sunday, April 15, 2012 at 5:32pm*

**college physics 44**

An unmarked police car traveling a constant 95km/h is passed by a speeder traveling 14km/h .Precisely 2.50s after the speeder passes, the police officer steps on the accelerator; if the police car's acceleration is 2.30m/s^2 , how much time passes before the police car ...
*Sunday, April 15, 2012 at 4:38pm*

**College Chem**

Based on the balanced equation 4Na + O2 → 2Na2O calculate the number of Na2O formula units formed when 60 Na atoms and 10 O2 molecules react? Thanks.
*Sunday, April 15, 2012 at 3:57pm*

**COLLEGE CALCULUS. HELP!**

the fundamental theorem of calculus, f(x)=∫(0,x) t^3+2t^2+2dt, and find f"(x). my answer was: f'(x)=x^3+x^2+2 f"(x)=x^4/4 + 2x^3/3 + 2x it said its wrong.
*Sunday, April 15, 2012 at 2:52am*

**COLLEGE CALCULUS. HELP!**

Evaluate the definite integral ∫(0,2) (x-1)^25 dx.. thats how i got stuck u=x-1, then du=dx =∫(0,2) u^25du =(1/26)u^26. i dont know what to do with integral (2,0)..
*Saturday, April 14, 2012 at 3:07am*

**Trig/PreCalc**

Teach me how to express 5sqrt3 - 5i in polar form please. I don't want you to do the work for me. Just show me the steps I need to do the work properly on my own. Otherwise I will not pass this class or the exam when I enter college, and I do not want to retake PreCalc. ...
*Friday, April 13, 2012 at 3:44pm*

**College Comp II**

What is the meaning & how did you figure it out? thanks March for a One Man Band by David Wagoner He’s *a boom a blat* in the uniform Of an army *tweedledy* band *a toot* Complete with medals *a honk* cornet Against *a thump* one side of his lips And the other stuck with...
*Thursday, April 12, 2012 at 8:45pm*

**College physics**

A 0.006 00-kg bullet traveling horizontally with a speed of 1.00 x 10^3 m/s enters an 20.1-kg door, imbedding itself 10.9 cm from the side opposite the hinges as in the figure below. The 1.00-m wide door is free to swing on its frictionless hinges. At what angular speed does ...
*Wednesday, April 11, 2012 at 1:40pm*

**College Algebra**

Annual profit in thousands of dollars is given by the function, P(x) = -.1x^2 + 50x - 300, where x is the number of items sold , x >= 0. 1.describe the meaning of the number -.1 in the formula. 2.describe the meaning of the number -300 in the formula. 3.find the profit for ...
*Monday, April 9, 2012 at 9:00pm*

**College Physics**

A 1.70 kg object attached to a spring moves without friction and is driven by an external force given by F = (3.00 N) sin(2πt). (a) If the force constant of the spring is 20.0 N/m, determine the period. _____s For this one I tried 2*pi*sqrt(1.7/20) but it said my answer ...
*Monday, April 9, 2012 at 8:38pm*

**Consumer math**

When Greg was born, his grandmother put $5000 in a savings account for his college expenses. It was compounded at 2.5 percent semiannually, and left in the account 18 years. How much was in the account? Round to the nearest dollar.
*Monday, April 9, 2012 at 10:21am*

**Statistics**

I'm going over some practice problems and I can't seem to figure this one out. Can anybody give me some help please? On a measure of artistic ability, the mean for college students in New Zealand is 150 and the standard deviation is 25. Give the Z scores for New ...
*Monday, April 9, 2012 at 1:36am*

**Math 1330**

In a survey of 1000 eligible voters selected at random, it was found that 200 had a college degree. Additionally, it was found that 90% of those who had a college degree voted in the last presidential election, whereas 47% of the people who did not have a college degree voted ...
*Monday, April 9, 2012 at 12:07am*

**college chem**

A sample of 8.00 L of NH3 (ammonia) gas at 22 degrees and 735 torr is bubbled into a 0.500 L solution of 0.400 M HCl (hydrochloric acid). The Kb value for HCl is 1.8x10^-5. Assuming all the NH3 dissolves and that the volume of the solution remains at 0.500 L, calculate the pH ...
*Sunday, April 8, 2012 at 7:31pm*

**College Physics **

A 40 kg child is standing on the edge of a merry-go-round in a playground. Before they were deemed too dangerous, these were quite common. They were just huge rotating platforms you could sit on while someone spun you around in uniform circular motion until you screamed in ...
*Sunday, April 8, 2012 at 6:23pm*

**College Physics 2056**

An electromagnetic wave strikes a 3.00-cm2 section of wall perpendicularly. The rms value of the wave's magnetic field is determined to be 6.00 10-4 T. How long does it take for the wave to deliver 1000 J of energy to the wall?
*Sunday, April 8, 2012 at 12:24am*

**Chemistry **

From data below, calculate the total heat (J) needed to convert 0.172 mol of gaseous ethanol (C2H6O) at 351° C and 1 atm to liquid ethanol at 25.0° C and 1 atm. Boiling point at 1 atm 78.5°C c gas 1.43 J/g · °C c liquid 2.45 J/g · °C ΔH&...
*Saturday, April 7, 2012 at 6:01pm*

**College Physics**

A radio station with a power of 20 kW sends out an omnidirectional wave at 1.25 MHz. a. If the electromagnetic wave has an electric field of 0.22 V/m, what is the magnetic field amplitude? b. What is the intensity of the wave at 5 km? c. What is the wavelength of the ...
*Wednesday, April 4, 2012 at 9:25pm*

**College algebra**

I need a step by step explaination of the example in my book. Find the domain of f(x)=(7x)/(x-8)
*Wednesday, April 4, 2012 at 1:05pm*

**College Chemistry**

A mixture of the compounds sodium oxide and magnesium chloride contains 2.4182 g of sodium oxide and is 89.3 % by mass magnesium chloride. The sodium oxide is 74.200 % by mass sodium. Calculate the moles of oxygen in the mixture. Thanks in advance.
*Wednesday, April 4, 2012 at 12:18am*

**basic college mathematics**

mechanic charges $35.00 an hour plus parts to fix a car, if the parts cost $90,00 dallars and it took 5 hours to do the job, what is the tolal cost of the repair
*Monday, April 2, 2012 at 6:25pm*

**College Algebra**

The height of a box is 3cm less than the width. The length is 2cm less than the width. The volume is 50cm^3. what is the width of the box?
*Monday, April 2, 2012 at 1:19pm*

**writing**

Which of the followinh is Not an example of persuasive writing? a position paper from an elected official a college admissions essay a movie review a summary of a textbook reading assessment (answer) Which of the following is a hasty generalization? Playing football gives you ...
*Sunday, April 1, 2012 at 11:50pm*

**MATH HELP**

At Jefferson College 15% of all students participate in athletics. If a class consists of 33 randomly selected students, how many of them would you expect to participate in athletics?
*Sunday, April 1, 2012 at 6:20pm*

**finance**

Weighted Average Cost of Capital)As a member of the Finance Department of Ranch Manufacturing, your supervisor has asked you to compute the appropriate discount rate to use when evaluating the purchase of new packaging equipment for the plant. Under the assumption that the ...
*Saturday, March 31, 2012 at 4:38pm*

**narayana junior college,physics**

a point charge q=-8.0nC is located at origin . find electric field vector at point x=1.2m,y=-1.6m
*Saturday, March 31, 2012 at 10:01am*

**NARAYANA JUNIOR COLLEGE .PHYSICS**

2 PARTICLES [FREE TO MOVE] WITH CHARGES +q and +4q are a distance L APART. A 3RD CHARGE IS PLACED SO THAT THE ENTIRE SYSTEM IS IN EQ2UILIBRIUM.FIND THE LOCATION,MAGNITUDE AND SIGN OF THE 3RD CHARGE
*Saturday, March 31, 2012 at 9:03am*

**COLLEGE CALCULUS. HELP!**

anti-derivation given f"(x)=3x+0 and f'(-1)=1 and f(-1)=5 find f'(x)=? and find f(2)
*Friday, March 30, 2012 at 6:11pm*

**College Chemistry**

A stock solution is prepared by adding 20mL of 0.2M Na3PO4 to enough water to make 80mL. What is the Na+ concentration of 20mL of the stock solution? I am thinking .012: a) .02 times .2 = .004 b).004 times 3 = .012 (for each Na in the molecule) Seems too simple
*Thursday, March 29, 2012 at 7:58pm*

**English**

I urgently need you to help me express the following sentence. Thank you. 1) In the past my daughter has suffered from a disease called oxyuriasis which can affect a person's intestine. I'll give her the proper medication in case she develops/contracts/catches this ...
*Thursday, March 29, 2012 at 3:33pm*

**computer science**

You have been working for the XYZ Computer Corporation as an entry-level software engineering since you graduated from college last May. You have done very well so far; you are respected by management, well liked by your fellow employees , and have been assigned to a team of ...
*Thursday, March 29, 2012 at 12:08pm*

**Economics**

How might earning a college degree increase lifetime earnings and employability?
*Wednesday, March 28, 2012 at 10:36pm*

**College Physics**

An electron with a speed of 1.9 × 107 m/s moves horizontally into a region where a constant vertical force of 5.4 × 10-16 N acts on it. The mass of the electron is 9.11 × 10-31 kg. Determine the vertical distance the electron is deflected during the time it ...
*Wednesday, March 28, 2012 at 7:02pm*

**College Health Law**

Following an automobile accident, a 16-year old boy who had recently escaped from a detention center was brought to the hospital emergency department by ambulance. The patient seemed to be alert and claimed to be suffering withdrawal symptoms from a drug habit. The patient ...
*Wednesday, March 28, 2012 at 6:26pm*

**ALGEBRA**

SOLVE IN LINEAR EQUATION? A university bookstore recently sold a wirebound graph paper notebook for $1.08, and a college ruled notebook for $3.12.At the start of the spring semester, a combination of 50 of these notebooks were sold for a total of $88.68 .How much of each type ...
*Wednesday, March 28, 2012 at 3:51pm*

**Economics**

Aside from humanitarian concerns, which of the following is one reason on nation is motivated to provivde foreign aid to a less developed country? A. Foreign aid is tax deductible B. The nation providing foreign aid decreases its unemployment. C. The nation providing foreign ...
*Wednesday, March 28, 2012 at 2:12pm*

**college statistic and algebra**

1.suppose that the demand forecast indicate that 1800 units of the product can be sold. the fixed cost is $3,000, the variable cost is $2 for each unit product and selling price $10 per unit. the decision to produce and sell 1800 units in a projected profit of? 2. what is the...
*Wednesday, March 28, 2012 at 11:39am*

**college algebra**

Determine the principal P that must be invested at rate r = 3 1 2 %, compounded monthly, so that $700,000 will be available for retirement in t = 13 years. (Round your answer to the nearest cent.) P = $
*Wednesday, March 28, 2012 at 11:29am*

**English**

Hi I'm doing a mla research paper for my college English class. My topic is What is Lupus? I having a difficult time coming up with a thesis for this topic. If anybody has any ideas please respond. Thanks
*Wednesday, March 28, 2012 at 10:32am*

**Transistion to College Math**

A rifle bullet is fired vertically with initial speed 490 m/s. how long does it take the bullet to reach its greatest height?
*Wednesday, March 28, 2012 at 2:27am*

**statistics**

Suppose that SAT scores among U.S. college students are normally distributed with a mean of 450 and a standard deviation of 150. What is the probability that a randomly selected individual from this population has an SAT score at or below 600?
*Tuesday, March 27, 2012 at 6:44pm*

**College physics**

Consider the two situations. In the first a machine must pull a box up a rough slope at constant speed. The mass of the box is 800 kg, the coefficient of kinetic friction is 0.2, and the slope is inclined at 15 degrees to the horizontal. In the second situation the machine ...
*Tuesday, March 27, 2012 at 1:09pm*

**College Chemistry**

In a reaction vessel, the following reaction was carried out using 0.250 mol of NH3(l) and 0.100 mol of N2(g). 4NH3(l) + N2(g) ¡ú 3N2H4(l) Which of the following represents the composition in moles in the vessel when the reaction reaches completion? ¡Ö0...
*Monday, March 26, 2012 at 9:23pm*

**College Chemistry**

Consider the following reaction. 3Ca(s) + N2(g) ¨ Ca3N2(s) What is the theoretical yield in grams for the reaction if 10.50 g of calcium reacts with 5.50 g of N2?
*Monday, March 26, 2012 at 9:22pm*

**College Chemistry**

The maximum amount of product D that can be produced from the following reaction is 55.75 g. 2A + B ¨ 2C + 3D Following an experiment based on this reaction, when the D was isolated, 50.67 g of D were obtained. What is the percent yield for this particular experiment?
*Monday, March 26, 2012 at 9:22pm*

**College Chemistry**

Consider the reaction. 4Fe(s) + 3O2(g) ¨ 2Fe2O3(s) If 0.500 mol of Fe reacts with 0.400 mol of O2, what are the limiting reactant and the theoretical yield in moles of Fe2O3 for the reaction, respectively?
*Monday, March 26, 2012 at 9:21pm*

**College Chemistry**

Animals break down glucose (C6H12O6) as a source of energy according to the following overall reaction. C6H12O6(aq) + 6O2(g) ¨ 6CO2(g) + 6H2O(l) What mass in grams of CO2(g) is produced from the reaction of 15.0 g of glucose?
*Monday, March 26, 2012 at 9:21pm*

**College Chemistry**

For the following reaction: A + 3B ¨ 4C Which of the following provides the direct link between the amount of reactant A and the amount of product C?
*Monday, March 26, 2012 at 9:20pm*