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January 28, 2015

January 28, 2015

Post a New Question | Current Questions

**college math**

Solve the quadratic equation by completing the square. x^2 + 14x + 35 = 0 and x^2 + 8x = 5
*Tuesday, May 22, 2012 at 7:42pm*

**english**

I wrote an essay because i'm apply to get into the honor's program. I'm supposed to write about who i was, who i am now, and who I would like to be. I would appreciate it if I got some feed back along with grammar correction. Is my essay even close to being okay or...
*Tuesday, May 22, 2012 at 1:12am*

**English - ms. sue**

ms. sue what this quote mean i only say that it mean that uncle al underestimate jacob, i not know how to explain it more. "I don't give a damn what it is - even if I gave you a job on the show, you wouldn't survive. Not for a week. Not for a day. The show is a ...
*Sunday, May 20, 2012 at 10:05pm*

**Psychology**

Please check my practice test 1. What are some self-control principles that you as a college student could use to increase the amount of time you spend studying with success? a) Find a quiet spot to work with minimal disturbance and set a modest target for how long you will ...
*Sunday, May 20, 2012 at 8:02pm*

**statistics**

In a survey of 400 college students, 40 were left-handed. Treating the sample as if it were random and using 0.015 as the standard deviation of the sampling distribution of the sample proportion, what is the lower bound of a 95% confidence interval for the population proportion?
*Friday, May 18, 2012 at 10:19pm*

**Statistics**

From random sample of 200 college students, 40 students indicated that they smoke cigarettes. Use the information from the sample to calculate a 95% confidence interval for the population proportion of college students that smoke cigarettes (round to nearest hundredth). A. (0....
*Friday, May 18, 2012 at 5:05pm*

**ALGEBRA**

From a survey of 100 college students, a marketing research company found that 70 students owned iPhones, 30 owned cars, and 15 owned both cars and iPhones. (a) How many students owned either a car or an iPhone (but not both)? students (b) How many students do not own either a...
*Wednesday, May 16, 2012 at 8:09pm*

**physics college**

Use Newton's Law of Gravitation to compute the work W required to propel a 1100 kg satellite out of the earth's gravitational field. You may assume that the earth's mass is 5.981024 kg and is concentrated at its center. Take the radius of the earth to be 6.37106 m ...
*Wednesday, May 16, 2012 at 4:38pm*

**physics college**

A billiard ball that is initially at rest is given a sharp blow by a cue stick. The force is horizontal and is applied at a distance h = 2R/3 below the centerline, The speed of the ball just after the blow is v0 and the coefficient of kinetic friction between the ball and the ...
*Wednesday, May 16, 2012 at 1:12am*

**physics college**

A billiard ball that is initially at rest is given a sharp blow by a cue stick. The force is horizontal and is applied at a distance h = 2R/3 below the centerline, as shown in the figure below. The speed of the ball just after the blow is v0 and the coefficient of kinetic ...
*Tuesday, May 15, 2012 at 11:57pm*

**writing**

what is wrong with this pargraph Since every person has only one opportunity to live each hour of his life, the time must be spent wisely. He should spend it thoughtfully. He should care what he does with his time. He should use good judgment. He should be intelligent in his ...
*Tuesday, May 15, 2012 at 10:35am*

**stat**

for randomly selected adults, IQ scores are normally distributed with a standard deviation of 15. the scores of 14 randomly selected college students are listed below. use a 0.10 significance level to test the claim that the standard deviation of IQ scores of college students ...
*Monday, May 14, 2012 at 9:33am*

**algebra**

you have just graduated from college and recently opened a specialty pizza restaurant. Based on surveys conducted in your area, you determine what it is feasible to sell your specialty for $15. The cost for making the pizzas includes a fixed cost of $55 and a labor cost of $4 ...
*Sunday, May 13, 2012 at 12:25pm*

**Math**

The cars in a car service use a total of gallons of gasoline per week. If each of the cars uses the same amount of gasoline, then, at this rate, which of the following represents the number of gallons used by 5 of the cars in 2 weeks? A. 10CG B. 2G/5C C. 5G/2C D. G/10C E. 10G/...
*Saturday, May 12, 2012 at 10:38pm*

**algebra**

Break-Even Analysis: A Look at Profit and Loss: As an entrepreneur, there are going to be many decisions that you need to make, such as the price to charge your customers for your goods and services. You have just graduated from college and recently opened a specialty pizza ...
*Friday, May 11, 2012 at 6:26pm*

**college algebra**

ln(9* e^3)
*Thursday, May 10, 2012 at 10:09am*

**math**

Jeff wants to start a lawn maintenance service to earn money for college. He wants to charge $25 for a small lawn and $35 for a large one. It takes him an average of 2 hours to mow and trim a small lawn and 3 hours to do a large one. He wants to make at least $250 a week but ...
*Wednesday, May 9, 2012 at 11:31am*

**College Geometry**

In discussing Frieze Groups it was assumed that there is a smallest positive translation along the axis. All translations for the pattern form a subgroup. Consider the axis to be the Reals and G to be a subgroup under +. Look at the infimum T of all strictly positive elements ...
*Tuesday, May 8, 2012 at 10:55am*

**College Physics Homework. Please help!**

A metal bar with a length of 0.30 m and mass of 0.5 kg is free to slide (no friction) on a set of vertical rails. The rails and bar together have a resistance of 500 ohms. The rails lie in a horizontal magnetic field with a strength of 0.04 T. The mass falls under the combined...
*Monday, May 7, 2012 at 7:10pm*

**statistics**

In a random sample of 112 State College students, 41 students reported being current smokers. a) Calculate the 95% confidence interval for the proportion of State College students who smoke.
*Monday, May 7, 2012 at 10:44am*

**statistics**

In a random sample of 112 State College students, 41 students reported being current smokers. a) Calculate the 95% confidence interval for the proportion of State College students who smoke.
*Monday, May 7, 2012 at 10:44am*

**math**

A sample of 64 statistics students at a small college had a mean mathematics ACT score of 28 with a standard deviation of 4. Estimate the mean mathematics ACT score for all statistics students at this college. Give the 95% confidence interval.
*Sunday, May 6, 2012 at 5:38pm*

**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.
*Sunday, May 6, 2012 at 5:36pm*

**Writing**

Can you proofread my research paper, I mostly need help on vary sentence structure? Being Poor Doesn’t Mean a Thing “You are my sunshine, my only sunshine. You make me happy when the skies are grey.” These are the lines from Louisiana’s famous singing ...
*Sunday, May 6, 2012 at 3:21pm*

**statistics**

To determine how many hours per week freshmen college students watch television, a random sample of 225 students was selected. It was determined that the students in the sample spent an average of 35 hours watching TV per week. The population standard deviation is known to be ...
*Sunday, May 6, 2012 at 12:14am*

**Nutrition **

Read this summary and then answer the questions. This is Tyler's freshman year in college, and he has been earning good grades and performing well in his part-time job. However, Tyler's eating habits have been poor, and has gained a few pounds. His expanded waistline ...
*Saturday, May 5, 2012 at 11:16pm*

**College algebra**

An architect wishes to design a large room 122 feet long that will be a whispering gallery. The ceiling of the room has a cross section that is an ellipse whose foci are to be located 14 feet to the right and the left of center. Find the height h of the elliptical ceiling ( to...
*Saturday, May 5, 2012 at 3:23am*

**College algebra**

A circular vent pipe with a diameter of 5.5 inches is placed on a roof that has a slope of 1/4. Find an equation of the ellipse that should be cut from the roof so that the pipe will fit. Round parameters to the nearest hundredth.
*Saturday, May 5, 2012 at 3:21am*

**College algebra**

Find the standard form of the equation of the hyperbola with the given characteristics. Foci:(+4,0) or (-4,0) Asymptotes: y=4x or y=-4x.
*Saturday, May 5, 2012 at 2:48am*

**College algebra**

A fountain in a shopping mall has two parabolic arcs of water intersecting. The equation of one parabola is y = -0.25x^2+2x and the equation of the second parabola is y=-0.205x^2+4x-11.75. How high above the base of the fountain do the parabolas intersect? All dimensions are ...
*Saturday, May 5, 2012 at 1:47am*

**College Chemistry**

A gas containing carbon and hydrogen analyzed as 85.6 % carbon and 14.4 % hydrogen. A 42.1 g sample of a gas occupied a volume of 7490 mL with a pressure of 2280.0 torr at 92 °C. Enter the molecular formula of the compound. Thanks.
*Friday, May 4, 2012 at 8:32pm*

**College chemistry**

Need help balancing chemical equation. Complete and balance the chemical equation. Be sure to include the states of the reactants and products. C3H8(g)+O2(g) →
*Friday, May 4, 2012 at 1:49am*

**intro to chemistry (college)**

A 64.8 g mixture of the compounds potassium sulfide and calcium oxide is 17.1 % by mass potassium sulfide. The compound calcium oxide is 71.5 % by mass calcium. Calculate the mass (g) of oxygen in the mixture. mass % = mass part/mass whole x 100. I attempted the problem by ...
*Thursday, May 3, 2012 at 11:46pm*

**Chemistry College**

A 79.1 g mixture of the compounds calcium chloride and sodium sulfide is 80.9 % by mass sodium sulfide. The compound sodium sulfide is 58.9 % by mass sodium. Calculate the mass (g) of sulfur in the mixture. thanks.
*Thursday, May 3, 2012 at 11:43pm*

**programmer**

/ Cooper College maintains a master file of students and credits earned // Each semester the master is updated with a transaction file // that contains credits earned during the semester // Each file is sorted in Student ID number order start Declarations num masterID string ...
*Thursday, May 3, 2012 at 7:09pm*

**college math**

Evaluate the expression for the given values. 6v less 12w for v = 10 and w = 2
*Thursday, May 3, 2012 at 6:17pm*

**Math**

Assume that the cost of a college education increases an average of 5% per year. If the in-state tuition at the University of Florida is $2256 per year, what will the tuition be in 10 years?
*Thursday, May 3, 2012 at 5:18pm*

**math**

one out of 43 high school ball players plays college ball.one out of 38 college players plays professional ball. what fraction of high school players plays professional ball?
*Thursday, May 3, 2012 at 3:48pm*

**English arts 1 Nouns**

Aaron plans to attend college once he completes this course workbook. im suppose to identify the nouns in the sentence the nouns are Aaron,college,workbook right? im debating on course idk? help lol
*Thursday, May 3, 2012 at 1:42pm*

**College Algebra**

The parking lot is 25 by 40 feet. The owner wants to enlage the parking lot by paving an equal width strip on the north side and east side of the lot, sot hat the new lot will be twice the area of the old one. Find the equation which has as a root the proper width of the strip.
*Wednesday, May 2, 2012 at 9:03pm*

**College Algebra/Geometry**

What size should be the frame be? Suppose an artist has a circular picture with a diameter 6 inches which she wishes to frame by a uniform width frame with covers 1/2 inch width uniformity of the painting and has total area equal to that of the exposed painted surface when the...
*Wednesday, May 2, 2012 at 9:00pm*

**college alegbra**

1/2 log 25- 3 log x
*Wednesday, May 2, 2012 at 5:00pm*

**statistics**

when 325 students are randomly selected and surveyed, it is found that 117 own a car. Construct a 99% confidence interval estimate of the true proportion of all college students who own a car.
*Wednesday, May 2, 2012 at 4:55pm*

**Basic college math**

A rectangular kennel measures 26 1/2 feet by 20 1/4 feet. Find the area of the kennel in square feet.
*Wednesday, May 2, 2012 at 1:03pm*

**Discreet MAth**

Describe the graph and why it is consistent with the matrix. How many simple paths are there from vertex 1 to vertex 5? Explain.Which is the shortest of those paths? Part II: Trees Construct and describe a tree that indicates the following: A college president has 2 employees ...
*Wednesday, May 2, 2012 at 12:47am*

**Discreet MAth**

Describe the graph and why it is consistent with the matrix. How many simple paths are there from vertex 1 to vertex 5? Explain.Which is the shortest of those paths? Part II: Trees Construct and describe a tree that indicates the following: A college president has 2 employees ...
*Tuesday, May 1, 2012 at 11:41pm*

**Sociology**

By a narrow margin, Dr. Moreau was elected chair of the largest academic department at Faber College. She appointed faculty members who support her views to the most influential and important committees in the department. This group of loyal colleagues, on which Dr. Moreau is ...
*Tuesday, May 1, 2012 at 7:12pm*

**english/check please**

Change each of these indirect quotations to direct quotations.Punctuate your quotation properly. examples: - Mrs king said,"I enjoyed our golf game" _Mrs king said that she enjoyed the golf game. 1)Mrs.King said that she wants a new putter. -Mrs King said," I ...
*Tuesday, May 1, 2012 at 1:50pm*

**college chemistry**

which of the following combinations is not suitable for making a buffer? h3po4 and nah2po4 na2co3 and nahco3 nh4cl and nh3 nah2po4 and na2hpo4 hclo4 and naclo4
*Monday, April 30, 2012 at 1:43pm*

**chemistry(college)**

A student reacts benzene,C6H6. with bromine. Br2. in an attempt to prepare bromobenzene. C6HSBr : C6H6 + Brl·---·-_·_-> C6HSBr + HBr (a) What is the theoretical yield of bromobenzene in this reaction when 60.0 g of benzene reacts with 60.0 g Brl? b) If ...
*Monday, April 30, 2012 at 12:45pm*

**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*

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