Tuesday

October 25, 2016
Total # Posts: 1,698

**Algebra**

Can a radical be negative when the index is even?

*November 1, 2011*

**Algebra**

Solve. .25(250)+250/250

*October 27, 2011*

**Algebra**

If 250 specialty coffee drinks were sold at the bake sale, what would the average cost per drink be given the equation .25x+250/x?

*October 26, 2011*

**chemistry**

I still have it wrong. I have pKa = 9.25. Solved for acid and got 2.39. Then I converted to grams and 62.25. Here's my work ka = 1.0e-14/1.8e-5 = 5.56e-10. solved for pKa -log(5.56e-10) = 9.25. H-H = 9.40=9.25 + log(1.70/acid). acid = 2.39. then, 2.39 x 0.490L = 1.17 M. ...

*October 26, 2011*

**chemistry**

How many grams of NH4Cl must be added to 0.490 L of 1.70 M NH3 solution to yield a buffer solution with a pH of 9.40? Assume no volume change. Kb for NH3 = 1.8 10-5.

*October 26, 2011*

**Algebra**

The average cost per drink can be found by dividing the total cost (.25x+250=total cost) by the number of drinks sold (x). Write an equation that shows the average cost per drink.

*October 26, 2011*

**Algebra**

Add. Simplify if possible. 3/v+8/v^2

*October 26, 2011*

**Algebra**

Add. Simplify if possible. 4/vy^2+9/yv^2

*October 25, 2011*

**Algebra**

Find all the numbers for which the rational expression is undefined: -24/25v

*October 25, 2011*

**Algebra**

Add. Simplify if possible. 4/vy^2+9/yv^2

*October 25, 2011*

**Algebra-Undefined**

Find all numbers for which the rational expression is undefined: -24/25v

*October 25, 2011*

**Algebra-Rational Equation**

4/vy^2+9/v^2y

*October 25, 2011*

**Algebra-Solve**

x/x+3-3/x-3=x^2+9/x^2-9

*October 25, 2011*

**Algebra/Time**

The officejet printer can copy Lisa's dissertation in 22 min. The laserjet printer can copy the same document in 18 min. If the two machines work together, how long would they take to print the document?

*October 25, 2011*

**Algebra-km/h**

Maria bicycles 4km/h faster than Javier. In the same time that it takes Javier to bike 60km, Maria bikes 72km. How fast does each bicyclist travel?

*October 25, 2011*

**Algebra/Math**

A group of parents is going to sell specialty coffee drinks including espresso, lattes, cappuccinos and mochas. It cost $250 to rent the equipment, which is a fixed cost. Additionally, the ingredients for each drink (x) cost $0.25. Write an equation that shows the total cost ...

*October 25, 2011*

**physics**

a fire hose held near the ground shoots water at a speed of 6.5m/s at what angle should the ozzle point in order that the water land 2.5m away? why are there two different angles?

*October 17, 2011*

**chemistry**

0.15g CS2

*October 16, 2011*

**english**

okay one more to be sure I got it. May Beth and ____ help with the decorations? She can go here because it is the subject and I need a subject pronoun??

*October 16, 2011*

**English**

It is confusing me when it is at the end of the sentence... Amelia Earhart also flew nonstop across the Atlantic; the first woman to do so was (her, she). I am thinking try the sentence with one word at a time to see which makes sense.. so I am thinking she?

*October 16, 2011*

**english**

What word is the correct one and why? When Samuel P. Langley built a steam-powered airplane, both the pilot and (he, him) were sure to fly.

*October 16, 2011*

**english**

Which word fits better and why? You and (me, I) have heard the Greek myth about lcarus.

*October 16, 2011*

**Physics**

A pelican flying along a horizontal path drops a fish from a height of 4.7 m. The fish travels 8.5 m horizontally before it hits the water below. What was the pelican’s initial speed? The acceleration of gravity is 9.81 m/s2 . Answer in units of m/s

*October 12, 2011*

**physics**

A shell is fired from a gun with a muzzle velocity of 466m/s at an angle of 57.4 degrees with the horizontal. At the top of the trajectory, the shell explodes into two fragments of equal mass. One fragment, whose speed immediately after the explosion is zero, falls vertically...

*October 10, 2011*

**statistics**

The sum of the draws from a box is 440. If the average of these draws is 2.20, how many draws were there?

*October 7, 2011*

**Algebra**

You need to solve for x, so start by getting x by itself. To do that, move the 8 to the other side of the equation by subtracting it from both sides. When you do that, you get: 3x>-6 Then, to get x by itself, divide both sides by 3. So you're answer will be: x>-2

*October 5, 2011*

**Calculus**

Find dy/dx by implicit differentation. ysin(x^2)=-xsin(y^2)

*October 5, 2011*

**math**

First distribute the 5: 5(3x-2y)-(x+6y) will become (15x-10y) -(x+6y) Then, distribute the - on the (x+6y): 15x-10y-x-6y Then, just combine the x's and y's and you'll end up with: 14x-16y

*October 5, 2011*

**Math**

2(6-4d)= 25-9d plz show step by step

*October 4, 2011*

**communication**

so if I did advertisment the media is advertisment and the medium could be televsion and or newspapers making it televsion advertisment ot newspapers But what could it be perhaps for music

*October 3, 2011*

**communication**

What are some froms of medium in popular culture?

*October 3, 2011*

**math**

lopez spent 1/3 of his vacation money for travel and 2/5 of his vacation money for lodging. He spent $1100 for travel and lodging. What is the total amount of money he spent on his vacation?

*October 3, 2011*

**math**

9x+6-4x=8 ---------- 2

*October 3, 2011*

**english**

Music or television I meant

*October 2, 2011*

**english**

Music of television

*October 2, 2011*

**english**

what are some research topics about popular culture

*October 2, 2011*

**Calculus **

find f'(a) for f(x)=1/sqrt(13-7x) i got my answer to be 7 / (7(13-7x)sqrt(13-7x)) but it says i am wrong please help

*October 2, 2011*

**Calculus **

find f'(a) for f(x)=1/sqrt(13-7x) i got my answer to be 7 / (7(13-7x)sqrt(13-7x)) but it says i am wrong please help

*October 2, 2011*

**physics**

An electron travels 3.75 m in 6.41 × 10−8 s. How fast does it travel? Answer in units of cm/s

*September 25, 2011*

**English 101**

What are some interesting topic regarding Pop Culture. Any ideas for my research paper.

*September 25, 2011*

**physics**

A 2.0-N force acts horizontally on a 10-N block that is initially at rest on a horizontal surface. The coefficient of static friction between the block and the surface is 0.50. What is the magnitude of the frictional force that acts on the block

*September 21, 2011*

**4th grade math help!**

Melvin estimated 645 + 322 by adding 600 + 300. Is his estimated sum an over or under estimate? Ty

*September 15, 2011*

**Math**

Melvin estimate 645 + 322 by adding 600 + 300. Is his estimate sum an over or under estimate please? Ty

*September 15, 2011*

**Math**

i need help with my math

*September 15, 2011*

**bio 12**

you have an orginal populatonof eagles, then humans introduce new eagles in the same area. the new eagles reduce the amountof resources in its home range. what type ofdistrubtion would give the most accuarte assesment of sustainable maximum popualtion. the three type of ...

*September 12, 2011*

**physics**

Find the density in g/cm3 of a 120 cm3 piece of metal having a mass of 2 kg.

*September 12, 2011*

**chemistry**

Find the concentration of Cu+ in equilibrium with CuBr(s) and 0.10 M Br-.

*September 11, 2011*

**grammar**

i need help making sure my daughters paragraph is puntuated correctly

*September 8, 2011*

**math**

Hello, Please help with the below question. write three numbers that are greater than 1,543,000 and less than 1,544,000 Thanks!

*September 8, 2011*

**physics**

given that the total mass of the plasric cup,heater and thermometer is 350g, determine the heat capacity of liquid x. hetaer heater the liquid with 20W.

*September 7, 2011*

**english**

Is this a run on or complete sentence? The desert is very hot during the day, the temperature in the desert may drop below freezing at night.

*September 5, 2011*

**chemistry**

a 100.00 mL sample of water has an initial temperature of 20.0 degrees C. The water is heated, and after 5 minutes its temperature is 50 degrees C. approximately how much energy was absorbed by the water? (the specific heat of wter is 4.18 J/g. degrees C

*September 3, 2011*

**Math 116**

Justin had $49 before spending n dollars on Jeans. How much money remains? Translate to an algebraic expression

*August 19, 2011*

**Calculus**

sif xyz=0 (-3x^2yz)^3 p=27x^7y^4z^6 then p=?

*August 15, 2011*

**math**

If all of the following operations are present in math calculation which of them should always be done first??

*August 12, 2011*

**single variable calculus - indefinite integrals**

Oh! I didn't realize it was so simple. Thank you!

*August 11, 2011*

**single variable calculus - indefinite integrals**

integral of (1-(sinx)^2))/(cosx)dx i don't know what to make my "u" for u-substitution

*August 11, 2011*

**Single Variable Calculus**

sorry, I typed the answer wrong. Can you please check this answer? lim as x-> infinity of sigma from i=2 to n of ((2+3i/n^2+(2+3i/n))(3/n)

*August 11, 2011*

**Single Variable Calculus**

find an expression for the area under the graph of f(x)= (x^2)+x from x=2 to x=5 as a limit of a riemann sum (do not need to evaluate). the answer i got was: lim as x-> infinity of sigma from i=2 to n of (2+3i/n)^2+(3i/n)(3/n) is this correct?

*August 11, 2011*

**business**

Could you please help me re write the sentences below. Media convergence is the merging of mass communications outlets such as television, radio and the Internet along with portable and interactive technologies though various digital presentation platforms. Media convergence ...

*August 1, 2011*

**Business**

I could not find her other post. I did read it aloud and to me it sounds good, but that is probably because I have read it over and over again for an hour.

*August 1, 2011*

**Business**

Could you please help me re word my paragrah? It needs to be at least 100 words. Media convergence is the merging of mass communications outlets such as television, radio and the Internet along with portable and interactive technologies though various digital presentation ...

*August 1, 2011*

**Media**

Could you please help me re word my paragrah? It needs to be at least 100 words. Media convergence is the merging of mass communications outlets such as television, radio and the Internet along with portable and interactive technologies though various digital presentation ...

*August 1, 2011*

**HUM**

Could you please help me re word my paragrah? It needs to be at least 100 words. Media convergence is the merging of mass communications outlets such as television, radio and the Internet along with portable and interactive technologies though various digital presentation ...

*August 1, 2011*

**HUM **

I did not understand this part of my class so here is the question What is media convergence? Provide an example of media convergence and explain the media elements that are being combined. Explain how the combination of media elements in your example may be useful and to whom...

*August 1, 2011*

**HUM**

Could you please help me re word this paragraph. I need it to be at least 100 words, but this one that I did was not good enough. Social media sites have affected commerce because people can advertise to thousands of people all at once through different sites. Social media ...

*August 1, 2011*

**HUM**

I have done all of this and the above paragraph is what I came up with, but to me it still does not look right. This is my own work and I have already sent it through plagiarism and it came back with 3%. Now I am needing someone's help.

*August 1, 2011*

**HUM**

Can you help me re do this paragraph that I did. I keep looking over it an am not happy but can not think of anyway to change it. Convergence in the context of media refers to the technology driven unification of different media channels. Media convergence allows mass media ...

*August 1, 2011*

**HUM**

COuld you please help me re word this sentence- Social media sites have affected commerce because people can advertise to thousands of people all at once through different sites.

*August 1, 2011*

**math**

How do you simplify 4w(9)? would it be 36w?

*August 1, 2011*

**algebra**

can somebody help me out? am I doing this right? using the elimination method. y = 3x + 2 2y-6x=4 We have the solution for y so we use this to solve 2 (3x + 2) – 6x = 4 6x + 4 – 6x = 4 0x +4 = 4 Subtract 4 from both sides X=0 Now we use 0 for the x value in equation ...

*July 30, 2011*

**physics**

An extreme skier, starting from rest, coasts down a mountain slope that makes an angle 25.0° with the horizontal. The coefficient of kinetic friction between her skis and the snow is 0.200. She coasts for a distance of 13.8 m before coming to the edge of a cliff. Without ...

*July 29, 2011*

**Chemistry**

What volume of liquid water is produced from the combustion of 10.00 L of octane, C8H18? (density of octane=0.692 g/mL

*July 25, 2011*

**algebra**

In 1920 the record for a certain race was 46.5 seconds. in 1980 it was 45.3 seconds let R(t) = the record in the race and t=the number of years since 1920 R(t) = 46.5 - t*0.02 what is the predicted record in 2003? 44.84 what is the predicted record in 2006?44.78 what year will...

*July 24, 2011*

**us history**

what were some tension over slavery in the 1840's?

*July 18, 2011*

**algebra**

Please help me find the domain for the following functions. If I understand this correctly I can use any number as long as the denominator does not equal zero 1) y = 7/(1 +x) can be any number except -1 2) y = -2/(6- x) can be any number except -6 3) y = 8/(2x - 1)can be any ...

*July 16, 2011*

**algebra**

Please help f(x) = 3x² + 2 x= 3 my question, do I start by solving x² first then multiply by 3 and adding 2 f(3= 3 * 9 + 2 = 29 or do I multiply first 3*3 =9² +2 = 83 I'm pretty sure we resolve the exponents first but need some help

*July 13, 2011*

**algebra**

Damon, thanks for your help, sorry the ">"is a typo on my part. the quation is y = 3x +5 Again that you for your help

*July 12, 2011*

**algebra**

Y= 3x+5> Is this equation a function? I believe it is but I am confused, My understanding of functions is that regardless of what number I use for x, as long as I get one answer for y it is a function

*July 12, 2011*

**Com **

Ok thank you. I was just wanting a "second eye" to look over it.

*June 29, 2011*

**Com **

Is there a way to submit an essay for review without someone being able to copy it??

*June 29, 2011*

**chemisry**

If you have 32g of NH3 how many moles of NH3 is that?

*June 19, 2011*

**statistics**

IQ is normally distributed with a mean of 100 and a standard deviation of 15. Suppose one individual is randomly chosen. Let X = IQ of an individual. The middle 30% of IQs fall between what two values?

*June 15, 2011*

**physics**

A golfer takes three putts to get her ball into the hole once she is on the green. Her first putt displaces the ball 71.0 ft north; the second, 6.0 ft, 45 degrees south of east; and the third, 3.0 ft, 45 degrees south of west. What is the magnitude of the displacement (in feet...

*June 14, 2011*

**pre calculous**

solve each equation algebraically and check it by substituing into the orignall equation. 50e^0.035x=200 3LN(x-3)+4=5 Method of your choice by solving. logx^2=6 Logx^4=2 2x-2^-x/2=4 e^x+e^-x/2=4 500/1+25e^.3x=200

*June 12, 2011*

**History**

Well this site is no help. Thanks, found a better one!

*June 11, 2011*

**History**

What do you think is the most significant thing to learn about the differences between social, political and economic systems in the world?

*June 11, 2011*

**8th grade math**

A 20 ounce bag of popcorn costs $2.80 at the movie theater, if the unit price remains the same, how much would a 35 ounce bag cost ? Please help me, I'm in math class and Im stuck.

*June 10, 2011*

**Statistics**

Employees in a large computer firm claim that the mean salary of the firm’s programmers is less than that of its competitors. The competitor’s salary is $47,000. A random sample of 30 of the firm’s programmers has a mean salary of $46,500 with a standard ...

*June 7, 2011*

**maths**

simn spent 2/5 of his pocket money on a computer game he spent 25% of his money on a ticket for a football match what is the fraction of his pocket money that he had left

*June 5, 2011*

**geometry**

given that a/b=c/d, decide whether it is true or not that a/c=b/d.

*May 26, 2011*

**Math **

log2(x)- log2(7) does this equal 1?

*May 24, 2011*

**pre-calculus**

what is the F-^1 of 6/x+4

*May 22, 2011*

**Chemistry**

oh my work wasn't entered correctly. the 0.5 M, 2nd +s, and 0.5+s should be under Ba+

*May 14, 2011*

**Chemistry**

How many grams of BaCO3 will dissolve in 3.0 L of water containing a Ba+2 concentration of 0.5 M (Ksp= 5.1E-9) My work: BaCO3 <-> Ba+ + CO3- i 0.5 M c -s +s +s e 0.5 +s +s (s)(0.5+s)= 5.1E-9 s= 1.0E-9mol/L x 3.0 L x 197.336 g/L= 5.92E-6 grams of BaCO3 dissolved ^Is this ...

*May 14, 2011*

**Physics**

Two students are on a balcony 19.6 m above the street. One student throws a ball (ball 1) vertically downward at 15.8 m/s; at the same instant, the other student throws a ball (ball 2) vertically upward at the same speed. The second ball just misses the balcony on the way down...

*May 13, 2011*

**Chemistry**

How do I take into account the change in volume?

*May 11, 2011*

**Chemistry**

Calculate the pH of the 0.20 M NH3/0.20 M NH4Cl buffer. What is the pH of the buffer after the addition of 10.0 mL of 0.10 M HCl to 65.0 mL of the buffer?

*May 11, 2011*