Monday

July 6, 2015

July 6, 2015

Total # Posts: 346

**Math**

Thanks I figured it out. The definition of x is the numbers since 1990.
*June 23, 2015*

**Math**

The number of prisoners measured in thousands can be described by the polynomial -2.06x^2+77.85x+750. According to the polynomial, by how much did the prison population increase from 2002 to 2007?
*June 23, 2015*

**algebra**

Alice puts money into two accounts, one with 2% annual interest and another with 3% annual interest. She invests 3 times as much in the higher yielding account as she does in the lower yielding account. If her total interest for the year is $27.50, how much did she invest in ...
*June 18, 2015*

**Chemistry**

A piece of copper 12 cm long, 8.5 cm wide, and .50 cm thick has a mass of 457 grams. What is its density? D = m/v D = 457 g / 12x8.5x.50 D = 457 / 51 = 8.96 g/cm^3 Is this correct?
*June 10, 2015*

**chem**

A sample of hydrogen with a volume of 800 mL exerts a pressure of 620 mm Hg at 5°C. Approximately what volume will it occupy at standard temperature and pressure? V2=800x620x273/760x278 =135,408,000/211,280 V2=640.9 mL Can someone tell me if I'm correct or not?
*May 19, 2015*

**polynominals**

The number of trout in America, since 1970, is given by the following: y = x^2 + 3x + 2, where x is the number of years and y is the number of trout in millions. What is the number of trout in the years 1975, 1980, and 1985?
*April 27, 2015*

**algrebra**

A scientist is working with 1.3m of gold wire. How long is the wire in millimeters? Be sure to include the correct unit in your answer.
*April 23, 2015*

**algebra**

I need some help with this math problem: Let n be the number of oil refineries at t years since 2005. A reasonable model of oil refineries is n= -2.23t + 210.53. What is the slope of this model? What does it mean in this situation?
*April 15, 2015*

**English**

3. Trainers can teach dolphins to jump through hoops. 6. We sung the song so many times we knew it by heart. Is it correct now?
*March 31, 2015*

**English**

Change the passive verbs to active verbs. Can you please tell me if these are correct or not? 1. The candles were lit by Father after we were called to dinner by him. Father lit the candles after he called us to dinner. 2. A beautiful sweater was received by Kokila from her ...
*March 31, 2015*

**algebra**

square root 2 (square root 10+8 square root2)
*March 12, 2015*

**Physics**

39- turn coil 3.20 cm 1.00 Ω B= 0.0100t + 0.0400t2 T= 5.40s lƩl =ΔφB/Δt = N (dB/dt)A =N[d/dt (0.0100t + 0.0400 t^2)A =39(0.0100 + 0.0800(5.40))[π(0.0320)^2] =0.05545 =5.55 x 10^-2 V =55.5 mV
*March 3, 2015*

**Chemistry**

A balloon filled with 1.35 atm of dimethyl ether gas and 5.25 atm of oxygen gas at 27 °C has an initial volume 2.00L They react according to the following reaction: C2H6O (g) + 3 O2 (g) -> 2 CO2 (g) + 3 H2O (g) The system is allowed to back cool down to 27 °C ...
*February 19, 2015*

**physics**

Paul lifts a sack weighing 245 newtons vertically from the ground and places it on a platform at a height of 0.7 meters. If he takes 10 seconds to do this task, what power has he expended during this time?
*February 18, 2015*

**statistics**

An automotive manufacturer has selected 10 car seats to study the Rockwell hardness of the seat recliner mechanism. A sample of 8 has an average of 44.795 and a standard deviation of 0.402. At 95% percent confidence level, what is the interval for the population mean?
*February 9, 2015*

**statistics**

A sample distribution (closely approximating a normal distribution) of a critical part dimension has an average of 11.85 inches and a sample standard deviation of 1.33 inches. The lower specification limit is 11.41 inches. The upper specification limit is 12.83 inches. What ...
*February 9, 2015*

**statistics**

A manufacturer of light bulbs has sampled 40 bulbs in order to determine the population mean life of the bulbs. The sample mean was 1,200 hours with a standard deviation of 100. The manufacturer would like to know, with 95% confidence, the interval values for the population mean
*February 9, 2015*

**BUSINESS MATH**

: The Crescent Corporation just paid a dividend of $2 per share and is expected to continue paying the same amount each year for the next 4 years. If you have a required rate of return of 13%,
*December 17, 2014*

**BUSINESS MATH**

: The Crescent Corporation just paid a dividend of $2 per share and is expected to continue paying the same amount each year for the next 4 years. If you have a required rate of return of 13%, plan to hold the stock for 4 years, and are confident that it will sell for $30 at ...
*December 8, 2014*

**BUSINESS MATH**

Moore Company is about to issue a bond with semiannual coupon payments, a coupon rate of 8%, and par value of $1,000. The yield-to-maturity for this bond is 10%.
*December 8, 2014*

**BUSINESS MATH**

Part B: The Crescent Corporation just paid a dividend of $2 per share and is expected to continue paying the same amount each year for the next 4 years. If you have a required rate of return of 13%, plan to hold the stock for 4 years, and are confident that it will sell for $...
*December 8, 2014*

**BUSINESS MATH**

The Crescent Corporation just paid a dividend of $2 per share and is expected to continue paying the same amount each year for the next 4 years. If you have a required rate of return of 13%, plan to hold the stock for 4 years, and are confident that it will sell for $30 at the...
*December 8, 2014*

**IT**

What enhanced security features does Microsoft Corporation offer/provide?
*December 4, 2014*

**Communications**

Why is it important that technology companies (Windows, Apple, etc.) make their products easily accessible for their consumers?
*December 3, 2014*

** physics**

a gun fires Aa bullet of mass 50g the bullet moving with a velocity of 100m/s strikes a sandbag get embedded after travelling 10cm calculate the resistance force exerted by the sand bag on the bulle
*August 24, 2014*

**statistics**

Kindergarten children have heights that are approximately distributed normal. A random sample of size 20 is taken and the mean x and the standard deviation s are calculated ( x = 40 inches and s = 3). a. Is there sufficient evidence to indicate that the mean of kindergarten ...
*August 3, 2014*

**Chemistry**

Consider the unbalanced redox reaction: Cr2 O7 2-(aq) + Cu(s) ----> Cr3+(aq) + Cu2+ Balance the equation in acidic solution and determine how much of a 0.850 M K2 Cr2 O7 solution is required to completely dissolve 5.25 g of Cu.
*July 22, 2014*

**Calculus **

(i) A 20m chain with a mass-density of 3kg/m (coiled on the ground). How much work is performed lifting the chain so that it is fully extended (and one end touches the ground)? (ii) How much work is performed to lift 1/4 of the chain?
*May 12, 2014*

**Chemistry **

Consider the following reaction: CaCO3(s)→CaO(s)+CO2(g). Estimate ΔG∘ for this reaction at each of the following temperatures. (Assume that ΔH∘ and ΔS∘ do not change too much within the given temperature range.) A) 310K and is it ...
*May 12, 2014*

**Physics**

oh 200 thanks
*May 11, 2014*

**Physics**

So what would the magnitude be then?
*May 11, 2014*

**Physics**

Bob is pulling a 30kg filing cabinet with a force of 200N , but the filing cabinet refuses to move. The coefficient of static friction between the filing cabinet and the floor is 0.80. What is the magnitude of the friction force on the filing cabinet? Express your answer to ...
*May 11, 2014*

**ALG**

1 r = 1 r1 + 1 r2 for r2
*April 4, 2014*

**physics**

A boy with a mass of 50 kg is hanging from a spring with a spring constant of 200 N/m. With what frequency does the boy bounce up and down?
*March 12, 2014*

**Personal Dimensions of Education**

are
*February 16, 2014*

**south carolina history**

Hi, did you every get the answer?
*February 2, 2014*

**physics**

480 N?
*January 29, 2014*

**physics**

The above equation is wrong
*January 10, 2014*

**SCIENCE? HELP!**

a i think
*December 16, 2013*

**psychology**

what might be some of the things that you could use as test items that would tap into this general form of intelligence that would not be overly affected by cultural matters? If not, why not?
*December 11, 2013*

**english**

the blank democratic movement slowly grew stronger as more people began to desire free elections. a:convened b:embarked c:incipient d:generated think its b
*December 2, 2013*

**Chemistry**

Hi, I'm a little stuck on this problem: Find the pH of the Hydrochloric acid solution when 5.0 mL of concentrated HCl, with a specific gravity of 1.18 and has 37% (w/w) purity is diluted to 2.0L
*November 11, 2013*

**Physics**

A spherical source radiates sound uniformly in all directions. At a distance of 12 m, the sound intensity level is 100 dB. At what distance from the source is the intensity level 40 dB? When I set it up as 100dB/40dB = r^2/(12m)^2, and got x = 18.97 meters, i was told this ...
*October 22, 2013*

**Physics**

A spherical source radiates sound uniformly in all directions. At a distance of 12 m, the sound intensity level is 100 dB. At what distance from the source is the intensity level 40 dB? When I set it up as 100dB/40dB = r^2/(12m)^2, and got x = 18.97 meters, i was told this ...
*October 22, 2013*

**Physics**

A spherical source radiates sound uniformly in all directions. At a distance of 12 m, the sound intensity level is 100 dB. At what distance from the source is the intensity level 40 dB? When I set it up as 100dB/40dB = r^2/(12m)^2, and got x = 18.97 meters, i was told this ...
*October 22, 2013*

**Help **

A result from being multiplied A. Product B. Quotient C. Multiplier D. Expression i say A but i got that wrong so im confused
*October 9, 2013*

**vocab**

i mark that and got that wrong i dont understand how thats wrong
*October 9, 2013*

**vocab**

A result from being multiplied A. Product B. Quotient C. Multiplier D. Expression a
*October 9, 2013*

**history**

2. William Lloyd Garrison’s The Liberator was known for appealing to its readers’ sense of (1 point) A. moral correctness. B. modern convenience. C. economic concern. D. social status. a
*October 6, 2013*

**Physics**

while john is traveling along an interstate highway, he notices a 160-mile marker as he passes through town. later john passes another mile marker, 115. a. what is the distance between town and john's current location? b.what is john's current location?
*September 2, 2013*

**Physics**

WHat is value of R please? cannot figure out.
*May 22, 2013*

**Science**

A 0.2 kg object is released from rest at point A on a track that is one-quarter of a circle with radius 1.6 m, as shown in the figure. It slides down and reaches point B with a speed of 4.8 m/s. Then it slides on a level surface a distance of 3 m until it comes to rest at ...
*May 15, 2013*

**Math**

How do you know when you should re write as a mixed number or simplify; for example. 1 1/2 x 23/9= 3/1 x 23/9= 69/18= what is the way to tell if I should simplify or re write as a mixed number?
*April 24, 2013*

**Physics**

A 20 mH inductor in series with a resistance of 55 ohms is connected to a source whose voltage is = 310 V cos 150πt, where t is in seconds. (a) Determine the maximum current in the circuit. (I solved this already, I=5.63A) (b) Determine the maximum and rms voltages across...
*April 17, 2013*

**Physics**

A 20 mH inductor in series with a resistance of 55 ohms is connected to a source whose voltage is = 310 V cos 150πt, where t is in seconds. (a) Determine the maximum current in the circuit. (I solved this already, I=5.63A) (b) Determine the maximum and rms voltages across...
*April 17, 2013*

**Physics**

A 20 mH inductor in series with a resistance of 55 ohms is connected to a source whose voltage is = 310 V cos 150πt, where t is in seconds. (a) Determine the maximum current in the circuit. (I solved this already, I=5.63A) (b) Determine the maximum and rms voltages across...
*April 17, 2013*

**algebra**

A 33-foot-long speaker wire is to be cut into three pieces. One piece is to be 11 feet long. Of the remaining pieces, one must be 2 feet less than 3 times the length of the other. Find the length of the shorter piece
*April 16, 2013*

**stats**

Use the given degree of confidence and sample data to construct a confidence interval for the population proportion p. 1) n = 128, x = 93; 90 percent
*April 15, 2013*

**stats**

Thirty random students took the final. If the sample mean was 86 and the standard deviation was 9.2 construct a 99 percent confidence interval for the mean score of all
*April 15, 2013*

**math**

A tree 15 m tall casts a show of 10m. A nearby building is 30 m tall. What is the length of its shadow?
*March 21, 2013*

**MATH**

250
*March 18, 2013*

**algebra**

Is 57/100 greater or less than 2/3?
*March 12, 2013*

**Sci**

when a large amount of FeCl3 is dissolved in water, a clear solution is formed at the beginning but eventually a precipitate is formed. Why? Explain with chemical equation.
*March 2, 2013*

**English**

oh okay thank you!
*February 24, 2013*

**English**

so not a site though. a site would be something that's there permanently, but then what about a chair?
*February 24, 2013*

**English**

Is a cardboard box a specific site? A staircase or chair would be a specific site, but what about boxes?
*February 24, 2013*

**biology (cell bio)**

Awesome, that makes much more sense. Thank you! My book was rather hard to follow in this section.
*February 9, 2013*

**biology (cell bio)**

Can someone explain the Nernst Equation and its purpose, in as simple terms as possible? For some reason it's just not clicking with me. Thanks!
*February 9, 2013*

**English **

I am categorizing files by numbers. But I have a couple of files w/o #'s. Then what 1 label would I give these group of files? Ex: # Unknown...
*February 2, 2013*

**Question**

I am categorizing files by numbers. But I have a couple of files w/o #'s. Then what 1 label would I give these group of files? Ex: # Unknown...
*February 2, 2013*

**Social Studies**

so cars polluting the environment would be a social issue? Also cloning would also be a social issue?
*January 29, 2013*

**Social Studies**

what would be an environmental issue that is directly a social issue? animal conservation?
*January 29, 2013*

**Social Studies**

Okay, so the same would go for any environmental issues?
*January 29, 2013*

**Social Studies **

Is overfishing a social issue?
*January 29, 2013*

**math (Urgent, please answer)**

What are some examples of two sets of related data with 10-25 data points each?
*January 23, 2013*

**math (urgent,please answer)**

What are some examples of two sets of related data with 10-25 data points each?
*January 23, 2013*

**math**

What are some examples of related data that have 10-25 points each?
*January 23, 2013*

**math**

a roofer measured the side of a roof to be 4.8 m long . It rises a height of 3.2 m . at what angle does the roof rise to the nearest degree?
*January 20, 2013*

**math**

from a point 50 m from the base of a cliff, a surveyor measures the angle of elevation to the top of the cliff as 73.2 degrees. how tall is the cliff to the nearest metre.
*January 20, 2013*

**Chemistry **

The solubility of bismuth iodide (BiI3) in water is 10.291 x 10-3 M. Calculate the value of the solubility product. The dissolution products are Bi3+(aq) and I−(aq)
*January 11, 2013*

**Chemistry **

A photon interacts with a ground state electron in a hydrogen atom and is absorbed. The electron is ejected from the atom and exhibits a de Broglie wavelength of 0.468×10−10 m. Determine the frequency (in hz) of the interacting photon.
*January 11, 2013*

**.345 g anhydrous**

Can you tell me for both.
*January 11, 2013*

**.345 g anhydrous**

What would .345g sample of anhydrous sample do to someone. Could it be harmful.
*January 11, 2013*

**Chemistry **

HELP!!! At temperatures above 930 ∘C, PbO reduces PbS to form metallic lead (Pb). The byproduct of the reaction is SO2. Calculate the amount of lead produced (in kg) when a reactor is charged with 487.0 kg of PbS and 750 kg of PbO.
*January 11, 2013*

**Chemistry**

A photon interacts with a ground state electron in a hydrogen atom and is absorbed. The electron is ejected from the atom and exhibits a de Broglie wavelength of 0.468×10−10 m. Determine the frequency (in hz) of the interacting photon.
*January 11, 2013*

**Chemistry**

HELP!!! Chacho At temperatures above 930 ∘C, PbO reduces PbS to form metallic lead (Pb). The byproduct of the reaction is SO2. Calculate the amount of lead produced (in kg) when a reactor is charged with 487.0 kg of PbS and 750 kg of PbO.
*January 11, 2013*

**Chemistry**

0.435
*January 11, 2013*

**Chemistry**

for a) no A NO B
*January 11, 2013*

**Chemistry**

3.27*10^-7
*January 11, 2013*

**math**

a rope was tied to trees at both ends the curve of the rope can be modelled by the equation y=x^2-12x where y is the height and x is the horizontal distance both in feet how far apart are the trees how do you know. show your work
*December 19, 2012*

**Physics**

A ship sailing through the St. Lawrence River (fresh water) enters the Atlantic Ocean (salt water). At equilibrium the ship will sit {higher or lower} in the Atlantic Ocean (salt water) compared to the St. Lawrence River (fresh water).
*December 18, 2012*

**,Math2**

calculate the cost per barrel if 4000 barrels were extracted from the ground C=9x2-144x+480000 this is a quadratic relation the 2 is a exoponet
*December 18, 2012*

**MATH**

if the minimum cost is $608.50 how many barrels are extracted in order to meet the minimum cost. C=9x2-144x+608.50 this is a quadratic relation that 2 is a exponet. please show your work
*December 18, 2012*

**Chemistry help please**

You wish to increase the carbon content of a slab of steel by exposing it to a carburizing atmosphere at elevated temperature. The carbon concentration in the steel before carburization is 359.5 ppm and is initially uniform through the thickness of the steel. The atmosphere of...
*December 16, 2012*

**Chemistry**

A latex balloon, wall thickness 3.091 x 10-4 m, contains helium at a concentration of 0.3 kg m-3. Under these conditions the total surface area of the balloon is 0.33 m2. The diffusion coefficient of He in latex at room temperature is 4.9 x 10-9 m2s-1. Calculate the rate of ...
*December 16, 2012*

**Chemistry (balloon)**

A latex balloon, wall thickness 3.091 x 10-4 m, contains helium at a concentration of 0.3 kg m-3. Under these conditions the total surface area of the balloon is 0.33 m2. The diffusion coefficient of He in latex at room temperature is 4.9 x 10-9 m2s-1. Calculate the rate of ...
*December 15, 2012*

**Chemistry**

Got the answer thanks anyway
*December 15, 2012*

**Chemistry**

Chemical analysis of a silicon crystal reveals gallium at a level of 3.091×10−4 atomic percent. Assuming that the concentration of thermally excited charge carriers from the Si matrix is negligible, what is the density of free charge carriers (free carriers/cm3) in...
*December 15, 2012*

**Chemistry**

I still didn't get it right
*December 15, 2012*

**Chemistry**

You wish to increase the carbon content of a slab of steel by exposing it to a carburizing atmosphere at elevated temperature. The carbon concentration in the steel before carburization is 359.5 ppm and is initially uniform through the thickness of the steel. The atmosphere of...
*December 15, 2012*