Thursday

November 26, 2015
Total # Posts: 1,398

**math**

Radioactive radium has a half-life of approximately 1599 years. What percent of a given amount remains after 100 years?
*February 24, 2011*

**math**

Radioactive radium has a half-life of approximately 1599 years. What percent of a given amount remains after 100 years?
*February 24, 2011*

**Chem**

how many grams of NH3 are required to completely react with 40.0 grams of NO.
*February 24, 2011*

**AP English Language**

1.) Repetition of "whatever is..." (more specifically anaphora) 2.) Rhetorical Question, drawing the audience into the "conversation"
*February 23, 2011*

**math**

What is 10-(-5)=?
*February 23, 2011*

**Math -Ultimate challenge puzzle**

where it says clyde- i meant claude
*February 22, 2011*

**Math -Ultimate challenge puzzle**

andrew, bernard, and clyde are bicicling. each one is riding the bicicle of on friend and wearing the hat of another. the one who wears claude's hat is riding bernard's bicicle. who is riding andrew's bicicle?
*February 22, 2011*

**Medical office**

what does it mean when you find a three digit code highlited in the tabular list A, Poisoning B. Accident, C. Theraputic Use D. Undetermined
*February 22, 2011*

**medical office**

what does it mean when you find a three digit code highlited in the tabular list
*February 22, 2011*

**chemistry**

How do you write a conversion factor relating cubic centimeters and milliliters?
*February 20, 2011*

**physics**

A solid copper object hangs at the bottom of a steel wire of negligible mass. The top end of the wire is fixed. When the wire is struck, it emits sound with a fundamental frequency of 300 Hz. The copper object is then submerged in water so that half its volume is below the ...
*February 16, 2011*

**Statistics**

Never mind, got it!!
*February 15, 2011*

**Statistics**

On average 3 % of a certain type of TV tube burn out before their guarantee has expired. If a merchant sells 120 such tubes, find the probability that he will be forced to replace at least 3 of them (Use the Poisson approximation to the Binomial distribution).
*February 15, 2011*

**Vocabulary**

What is the best comparison of incentive is to goad as a. pontential is to mortify b. quibble is to dishearten c. flaw is to entice d. hazard is to dissuade
*February 15, 2011*

**Calculus**

Solve the differential equation. t(dy/dt) + 2y= t^3 t>0, y(1)=0 I think I solved it properly, I'm just trying to check my final solution.
*February 15, 2011*

**History**

A prince whose character is thus marked by every act which may define a tyrant is unfit to be the ruler of a [free] people who mean to be free. Future ages will scarcely believe that the hardiness of one man adventured, within the short compass of twelve years only, to lay a ...
*February 15, 2011*

**History**

What is centralization in education and what is decentralization in education. Is there a difference. Is one better than another?
*February 15, 2011*

**History**

what is the difference of Centralization or decentralization dealing with education?
*February 15, 2011*

**History**

Did the writers of the Constitution validate the ideals of the Declaration or betray them?
*February 15, 2011*

**History **

Why has this portion been taken out of the declaration of independence "He has waged cruel war against human nature itself, violating its most sacred rights of life and liberty in the persons of a distant people who never offended him, captivating & carrying them into ...
*February 15, 2011*

**economics**

Suppose you wish to invest X dollars in a bank account which pays 5% per year. You want to use this account to pay for costs that appear each year, starting with year 15. The amount you have to pay in year 15 is 276.71 and then the payments grow at a rate of 5% per year until...
*February 13, 2011*

**math**

how do you solve the exponential equation, 12^x = 14^3x? If someone could show me step by step I would greatly appreciate it. thank you! :)
*February 13, 2011*

**Physics **

Picture the following: A square with 4 point charges. Charges Q are diagonal from eachother, and charges -Q are diagonal from eachother. The length of each side is "a". One of the -Q charges is "kicked" away with an outward initial speed of V0, while the ...
*February 12, 2011*

**Physics**

Two point charges are placed on the x axis. The charge +4q is at x=3.00 m, and the -q charge is at x=-3.00. a) There is a point on the x axis between the two charges where the electric potential is zero. Where is this point? Found it to be: -1.80m b) The electric potential ...
*February 12, 2011*

**physics**

If the ball is in equilibrium when the string makes a 25.9 ◦ angle with the vertical as indicated, what is the net charge on the ball? Answer in units of µC. i know how to do this if i had the balls mass and the electric field or some other information, but im lost...
*February 10, 2011*

**earth science**

What is the most abundant fossil fuel?
*February 10, 2011*

**science**

What role do condensation nuclei play in condensation? (cloud flormation) I did some research and found that the condensation nuclei attract water and produce condensation so would that mean my answer would be something like 'that the condensation nuclei help to form the ...
*February 8, 2011*

**economics**

Jerry is considering buying today a new bond which makes infinite annual payments. In particular the bond pays its holder 557.3 dollars one year from the day of purchase and the annual payment increases by 129.32 dollars each year thereafter. What is the maximum amount that ...
*February 6, 2011*

**economics**

In order to have money for their daughter's college education, a young couple started a savings plan into which they made intermittent deposits. They started the account with a deposit of 128.44 dollars (in year zero) and then added 421.97 dollars in year 3, and 723.46 ...
*February 5, 2011*

**economics**

Nair Inc. bought a "growing perpetuity" bond. The bond will pay 631.85 dollars at the end of year 1 and the payment will increase by 2.5 percent each year forever thereafter. Assuming the interest rate is 11.26% (forever), what is the maximum amount that Nair Inc. ...
*February 5, 2011*

**economics**

Suppose you wish to create a scholarship fund which will pay 73.43 each year for the next 14 years. If you accomplish your task by depositing a single amount today into a bank account which pays 12.91% per year, what must the deposit amount be? (Accuracy is at the second ...
*February 5, 2011*

**MATH**

(A) y=110-2.75x Then graph that. (B) 40 school days
*February 5, 2011*

**MATH**

(B) 40 school days
*February 5, 2011*

**Physics**

An object of mass m= 4.8g and charge Q = 49uC is attached to a string and placed in a uniform electric field that is inclined at an angle of 30.0 with the horizontal (see the figure). The object is in static equilibrium when the string is horizontal. a) find the magnitude of ...
*February 3, 2011*

**Physics**

A small m = 2.00 g plastic ball is suspended by a L = 24.0 cm long string in a uniform electric field, as shown in Figure P15.50. If the ball is in equilibrium when the string makes a 18.0° angle with the vertical as indicated, what is the net charge on the ball? The ...
*February 1, 2011*

**Physics**

A small m = 2.00 g plastic ball is suspended by a L = 24.0 cm long string in a uniform electric field, as shown in Figure P15.50. If the ball is in equilibrium when the string makes a 18.0° angle with the vertical as indicated, what is the net charge on the ball?
*February 1, 2011*

**math**

40%
*January 30, 2011*

**Calculus **

Find the area enclosed by the following functions from x=0 to x=2: y=sqrt*(x+2) y=1/(1+x) I got 2/3(8)-ln3-2/3(sqrt*8) can someone please verify this?
*January 30, 2011*

**Math**

i) The two lines 4x-6y=-5, and 7x+6y=7 intersect at the point where x= and y=? ii) If the line 7x+ky=7 is parallel to 4x-6y=-5, then what is the value of k? Answer: k = ?
*January 28, 2011*

**Algebra 1**

I'm graphing linear inequalities...it says I need to do: y<2x+4 y>5 How do I do this?
*January 27, 2011*

**Physics**

An organ pipe open at both ends has a harmonic with a frequency of 480 Hz. The next higher harmonic in the pipe has a frequency of 540 Hz. Calculate the frequency of the fundamental and the length of the pipe. I know 540/480 is 9/8. I have no idea where to go from here.
*January 26, 2011*

**Calculus**

Integrate the following: sin^3 x/cosx Have attempted numerous ways but can't get anything sensible to come out of it.
*January 24, 2011*

**Social Studies**

How did events at Chickamauga and Chattanooga affect Georgians?
*January 24, 2011*

**math**

how to find the height of a trapezoid with median 12 and area 84
*January 24, 2011*

**Chemistry**

Calculate the concentrations of S2O8 2-, I-, S2O32 2- in moles per litre of reaction mixture given the following: 20mL of 0.1 M (NH4)2S2O8 added to: 20mL of 0.2M KI 10mL of 0.01M Na2S2O3 5mL 0.2% starch Also, calculate -(delta)S2O8 2- that is, how much S2O8 2- is used up (...
*January 24, 2011*

**Chem- Dr. Bob! **

Posted by Rachel on Thursday, January 20, 2011 at 3:57pm. Does anyone know where I can get an image of the valence bond model for maleic acid? ie. showing the pi and sigma bonds and indicating the hybridization (sp2, sp3.. ) OR could someone describe these things to me? I'...
*January 23, 2011*

**Calculus **

That would be great if you could! I'm working on getting the correct indefinite as you have above, but when I get it it would be great to have something to check my definite integral with :)
*January 22, 2011*

**Calculus **

Okay, so I ended up with the expression: 1/2[4/3arctan(4(x^2+1/2)/3) Can you confirm this is correct before I use the fundamental theorem of calculus to determine the definite integral please.
*January 22, 2011*

**Calculus **

Find the integral of x/ (x^4+x^2+1) from 2 to 3. I was going to integrate using the method for partial fractions but I can't factor x^4+x^2+1.
*January 22, 2011*

**Calculus**

What is the integral of 1-tan^2theta from 0 to pi/3? Using the identity tan^2theta=sec^2theta-1, I got my answer to be 2pi/3 - sqrt*3 Can someone verify this for me please?
*January 22, 2011*

**Chem- Dr. Bob! **

Oh! Okay, I'm familiar with R groups on amino acids etc.. The question just asks me to label the hybridization for each carbon and oxygen atom. So here's what I've got: The carbon atoms bonded to eachother are sp2 hybridized atoms. The carbon atoms bonded double ...
*January 22, 2011*

**Chem- Dr. Bob! **

Posted by Rachel on Thursday, January 20, 2011 at 3:57pm. Does anyone know where I can get an image of the valence bond model for maleic acid? ie. showing the pi and sigma bonds and indicating the hybridization (sp2, sp3.. ) OR could someone describe these things to me? I'...
*January 22, 2011*

**Chemistry **

Can someone please check my work? Calculate the mass of (NH4)2S2O8 needed to prepare 250mL of a 0.100M solution. I got 5.705 g. Calculate the volume of 2.00M KI needed to prepare 250mL of a 0.200M solution. I got 0.025L or 25mL. Calculate the volume of 0.100M Na2S2O3 needed to...
*January 22, 2011*

**Chemistry**

Does anyone know where I can get an image of the valence bond model for maleic acid? ie. showing the pi and sigma bonds and indicating the hybridization (sp2, sp3.. ) OR could someone describe these things to me? I'm just trying to check my work and make sure I didn't ...
*January 20, 2011*

**statistics**

Ordinal. Data is classified into two types: qualitative (aka categorial) or quantitative. Within the qualitative types, there are ordinal (which is ordered data- common ex. is sm, md, lrg- just as in your question) or non-ordinal.
*January 20, 2011*

**geometry**

How can I prove that triangle jlm is congruent to triangle ljk if line jl is perpendicular to line lm and line lj is perpendicular to line jk and line mj is congruent to line kl
*January 19, 2011*

**English**

It was impossible for him to come. What part of speech is "impossible" in the previous sentence?
*January 18, 2011*

**English**

In the sentence "He was made clean." what part of speech is clean?
*January 18, 2011*

**math**

528
*January 11, 2011*

**math**

The answer is 18,444
*January 9, 2011*

**Algebra-Please help**

so the answer is x = 6 according to what you're saying? and the domain is the (h) in here correct? So in the future I just look for the h , take the opposite and that is my domain?
*January 8, 2011*

**Algebra-Please help**

Where do I look for the domain in this- The domain of y =1/(x-6) + 3 Possible answers: All real numbers except x=6 All real numbers except x = -6 All real numbers except x=3 All real numbers except x= -3 Thank you
*January 8, 2011*

**Algebra**

Is there an easier way to do this? "A freight train leaves a station at 4:00 p.m. traveling at 30 kilometers per hour. A passenger train leaves 1 hour later, traveling at 50 kilometers per hour. At what time will the passenger train overtake the freight train?
*January 3, 2011*

**5th grade math**

3/6 - 2/6 = 1/6
*January 3, 2011*

**Physics**

Consider a version of the atwood machine in which the masses are frictionless incline. The mass sliding on incline 1, m1, is 1.5 kg, and the angle of this incline is 62 deg. If the mass on the second incline, m2, is 2.5 kg, what is the angle 2 so that the system does not ...
*December 28, 2010*

**math**

how to make 29 9ths a mixed number
*December 19, 2010*

**English**

with my irl
*December 16, 2010*

**Physics **

Describe how an electroscope works?
*December 14, 2010*

**algebra 2**

The length of a rectangle is 5 less than 3 times the width. If the perimeter is 54 units, what is the length and the width?
*December 14, 2010*

**algebra**

combine and reduce 6b/3a + b/a = answer 3b/a
*December 10, 2010*

**mrs. sue please read (History)**

What about for single parents?
*December 7, 2010*

**History quick question**

Did people back in the 1700's use financial aid/assistance.?
*December 7, 2010*

**huckleberry finn**

thrashed (25) cowhiding (25) licked (26) skinned stonned tanned I do not know the page numbers for the last 3
*December 5, 2010*

**Chemistry**

Explain why CH2ClBr and CH2Cl2 do not have optical, geometric, or structural isomers?
*December 2, 2010*

**physics**

how many lunar radii are in one AU?
*December 1, 2010*

**More Frequency - Physics**

A guitar player plucks two strings simultaneously. One string is tuned to a (fundamental) frequency of 381 Hz. It is found that beats are audible, with a beat frequency of 5.54 Hz. What are possible values for the frequency of the other string? (Answer the larger frequency ...
*November 29, 2010*

**Frequency - Physics**

An organ pipe that is closed at one end has a fundamental frequency of 128 Hz. There is a leak in the church roof, and some water gets into the bottom of the pipe, as shown in the Figure. The organist then finds that this organ pipe has a frequency of 217 Hz. What is the depth...
*November 29, 2010*

**math**

Ms. Gutierrez needs to order rope for her gym class of 32 students. Each student will receive a piece of rope that is 5 feet 8 inches long. What is the total length of rope Ms. Gutierrez needs to order for her class?
*November 26, 2010*

**Math**

Rationalize the denominator. Assume all variables represent positive numbers? - 245x3 y5
*November 23, 2010*

**physics**

How much work must be done to stop a 1040 kg car traveling at 111 km/h?
*November 22, 2010*

**Algebra**

Show that two WRONG's can make a RIGHT. Replace each different letter in the addition problem with a different digit. It is required that O=zero.
*November 21, 2010*

**Chemistry**

Cobalt-60 is a radioactive isotope used to treat cancers. A gamma ray emitted by this isotope has an energy of 1.33 MeV (million electron volts; 1 eV = 1.602 multiplied by 10-19 J). What is the frequency (in Hz) and the wavelength (in m) of this gamma ray?
*November 21, 2010*

**algebra 2**

can you answer this question? a store is offering a discount of 30% on a suit. There is a sales tax of 6%. A) using a composition of function, represent this situatio in which the discount is taken before the sales tax is applied. B) using a composition of functions represent ...
*November 16, 2010*

**sociology**

Ok thank you so much for the help!! This is how I described the difference between them. Deviance-In a sociological context describes actions or behaviors that violate cultural norms including formally-enacted rules as well as informal violations of social norms. It is the ...
*November 15, 2010*

**sociology**

What is the difference between deviance and nonconformity?
*November 15, 2010*

**math**

not sure!
*November 15, 2010*

**math**

solve for x: 2xcubed+18x=-15xsquared
*November 15, 2010*

**chemistry**

For each of the following acid-base reactions, calculate how many grams of each acid are necessary to completely react with and neutralize 2.1g of the base. 1) HCl(aq)+NaOH(aq)-->H2O(l)+NaCl(aq) 2) 2HNO3(aq)+Ca(OH)2(aq)-->2H20(l)+Ca(NO3)2(aq) 3) H2SO4(aq)+2KOH(aq)-->...
*November 11, 2010*

**chemistry**

Determine the theoretical yield of C when each of the following amounts of A and B are allowed to react in the generic reaction: A+2B-->3C 1) 1mol A; 1 mole B 2) 1mole A; 3 mole B 3) 2mole A; 2 mole B 4) 32mole A; 68 mole B
*November 10, 2010*

**chemistry**

the value for the Ksp of silver chromate is reported to be 1.1 x 10^-12. in a saturated solution of silver chromate, the silver ion concentration is found to be 2.5 x 10^-4M. what must the chromate ion concentration be?
*November 10, 2010*

**Geometry**

A farmer uses 140 ft. of fencing to enclose a rectangular field. if the ratio of length to width is 3:4, find the diagonal of the field. Any help is appreciated, thank you!
*November 7, 2010*

**French**

Can you check these thanks. Le métro Directions: Completez 1. Il y a dix tickets de métr dans un ----------. Answer: carnet 2. On peut acheter des tickets au ----------- ou au -------------. Answer 1: guichet Answer 2: distribueur automatique 3. Les voyageurs ...
*November 4, 2010*

**chem**

How do I figure out the final Fe?
*November 4, 2010*

**chem**

A 455-g chunk of iron is removed from an oven and plunged into 385g water in an insulated container. The temperature of the water increases from 27 degrees celsius to 89 degrees celsius. If the specific heat of iron is 0.449 J g^-1 degrees Celsius^-1, what must have been the ...
*November 4, 2010*

**chemistry**

How many calories does it take to convert 22 grams of liquid water with a temperature of 48 degrees C to steam?
*November 4, 2010*

**science**

I mean Is 2Ag+S the same as Ag2S? The 2nd 2 is supposedly a subscript
*November 2, 2010*

**science**

Is 2Ag+S the same as Ag©üS?
*November 2, 2010*

**Statistics**

IQ test scores are normally distributed with a mean of 97 and a standard deviation of 11.An individual's IQ score is found to be 123.Find the z-score corresponding to this value
*November 2, 2010*

**physics**

thanks
*October 28, 2010*

**physics**

What force is required to accelerate a 90kg bike to 20 m/s in 15 sec? I need to know HOW to do it!
*October 28, 2010*