Thursday

September 3, 2015
Total # Posts: 409

**Physics**

never mind. I made a silly error. i got .01804 moles...multiplied that times 4.03grams and then multiplied that times 1000 and got 72.7mg. got it! thanks so much!
*May 4, 2010*

**Physics**

so i got the answer to be .01804 moles and i know one mole of helium is 4.03 g do i just multiply the two together? and then divide by 10000 to convert g to mg?
*May 4, 2010*

**Physics**

doesnt that give me an answer in moles? ...is there a way to convert moles to mg?
*May 4, 2010*

**Physics**

A sample of helium behaves as an ideal gas as it is heated at constant pressure from 273 K to 373 K. If 15.0 J of work is done by the gas during this process, what is the mass of helium present? I am not sure what equations to use for this problem....
*May 4, 2010*

**Physics**

Having landed on a newly discovered planet, an astronaut sets up a simple pedulum of length 1.29 m and finds that it makes 567 oscillations in 1020 s. The amplitude of the oscillations is very small compared to the pendulum's length. What is the gravitational acceleration ...
*January 7, 2010*

**Physics**

Having landed on a newly discovered planet, an astronaut sets up a simple pedulum of length 1.29 m and finds that it makes 567 oscillations in 1020 s. The amplitude of the oscillations is very small compared to the pendulum's length. What is the gravitational acceleration ...
*January 7, 2010*

**math**

Why is (AB)^-1 = B^-1A^-1 in matrices, and not (AB)^-1 = A^-1B^-1
*December 16, 2009*

**math**

an extremely volatile substance, Ofnetite, has a half-life of 25 minutes. Find the percentage decrease of this substance in the first two hours.
*November 8, 2009*

**math**

OMG u are in watever grade and im in 6th and know how 2 do that!!!!
*November 4, 2009*

**pre-algebra**

twenty more than three times a number is -4.
*November 2, 2009*

**chemistry**

sorry i forgot some of the units in the initial posting 8.00g of NaOH are dissolved in water to make 4.00L of solution. What is the concentration of hydronium ions, , in this solution?
*November 2, 2009*

**chemistry**

8.00g of NaOH are dissolved in water to make 4.00 of solution. What is the concentration of hydronium ions, , in this solution?
*November 2, 2009*

**chemistry**

8.00 of are dissolved in water to make 4.00 of solution. What is the concentration of hydronium ions, , in this solution?
*November 2, 2009*

**math**

what's a prime number?
*October 17, 2009*

**Math**

Find the smallest postive integre that gives a remander of 2 when divided by either 3 0r 7, and gives a remainder of 3 when divided by 5.
*September 26, 2009*

**Science**

A set of controlled steps used to answer scientific questions is?
*September 21, 2009*

**precal**

could someone help me with this problem? find 2 postive and 2 negative coterminal angles of -(pi)/4
*September 14, 2009*

**research writing**

What would you do differently if your were just starting this course?
*June 11, 2009*

**science**

what is a website i can go on that is a website with enviromentally friendly prouducts and why?
*April 23, 2009*

**science**

talking
*April 23, 2009*

**science**

A. radiation
*April 23, 2009*

**science**

do you know any enviromentally friendly products, and why they are better for the earth?
*April 23, 2009*

**Business Communication**

D is the answer, subj is athletes, not one.
*April 3, 2009*

**Math**

for the deposit, use thsi as your equation: 1000(1+.07)^4 for the investment in RGF use this as your equation: 10000(1+.01)^6 Just plug them into a calulator to solve.
*March 9, 2009*

**Algebra I - Answer check**

2. a) 7^12/7^4 = 7^8 b)x^11/x^5 = x^6 c)12x^5/3x^2 = 4x^3 d)7x^6y^3/14x^3y = .5x^3y^2 5. a) (2x)^3(3x^2)^4 = 648x^11 b)(5x)^7/(5x)^4 = 25x^2 c)(2x)^5/-8x^3 = -4x^2 d)(4x^2y^5)(-3xy^3)^3 = -12xy^4 6. How long does it take light to travel from the Sun to Earth? Answer to the ...
*March 9, 2009*

**algebra 1**

Determine whether each trinomial is a perfect square trinomial. x^2-16x+64
*March 9, 2009*

**Algebra I**

thank you
*March 3, 2009*

**Algebra I**

Match expressions from this list that are equivalent but written in different forms. There can be multiple matches. I know that there is a group of 3, and a group of 2, matching expressions. Here are the expression-I need help figuring out how to go about this. a.) (2x^2)^3 b...
*March 3, 2009*

**algebra 1**

the terms a and b are being added. Since they are being added, and aren't the same variables, they cannot be factored.
*March 3, 2009*

**Math**

...what were your coordinates?
*March 2, 2009*

**Algebra I**

oh-wow.totaly mind blank there-thank you for answering my question. After reading it a while i finally got it! Thanks again
*March 2, 2009*

**Algebra I**

I guess i can try to clear it up. Sorry. So I'm adding the exponents of 1 for EACH variable/base x. That'd make it x^2. Okay, so if i have to rewrite the equation with just one exponent, then would i put the x^2 after JUST ONE of the coefficents? Like this: 4x^2(3) or ...
*March 2, 2009*

**Algebra I**

If i have two base variables with exponents for example: 4x(3x) After getting x^2-would i have just ONE variable base? i.e. 4(3x^2) or place the exponent on BOTH variable bases like this: 4x^2(3x^2)? Thanks!
*March 2, 2009*

**ALGEBRA**

Divide -272 by 2. Then check your work. THEN, make sure that when you add them, they equal two. If not, then you either did the math wrong, or my method is wrong. Either way, good luck.
*March 2, 2009*

**Algebra**

i go with y=mx+b. just plug in a point on the line, try to get a solid number, no decimals, and postive if possible. If not that's okay. Then plug in your slope and solve for b. So using (7,0) your equation should look kinda like this: y=mx+b 0= -8(7)+b ....that doesn'...
*March 2, 2009*

**Algebra I**

whoops, meant to post that as a question. just...disreagard that last comment please, and Thanks Reiny. Sorry-it's a very late Monday for me.
*March 2, 2009*

**Algebra I**

If i have two base variables with exponents for example: 4x(3x) After getting x^2-would i have just ONE variable base? i.e. 4(3x^2) or place the exponent on BOTH variable bases like this: 4x^2(3x^2)? Thanks!
*March 2, 2009*

**Algebra I**

(-4m^3)(2m+m^2) I have to use the property of exponents to rewrite the expression. I'm just asking if -3^6 is right. (we don't have to solve it--just simplify it) Thank you!
*March 2, 2009*

**english 1 honors**

ok thats what i was thinking. thank you so much :-)
*February 26, 2009*

**english 1 honors**

Can someone tell me the sentence structure of this sentence? In Frank R. Stockton's short story "The lady or the tiger?" one knows that the semi- barbaric princess motions to her lover to pick the door that contains the tiger.
*February 26, 2009*

**Algebra I**

thank you so much!
*February 19, 2009*

**Algebra I**

Write each percent change as a ratio comparing the result to the original quantity. Then write it as a constant multiplier. Book's example: 3% increase, 103/100, 1+0.03 I don't understand double digit numbers. The one that I have to solve is an 11% decrease. Tips, ...
*February 19, 2009*

**8th grade Science**

thank you
*February 19, 2009*

**8th grade Science**

I need help really bad. What are the three ways that unbalanced forces can cause an object to change it's motion?
*February 19, 2009*

**Algebra**

I have to write each of the following percent change into a ratio comparing it to the original quantity. Then I have to write it as a constant multiplier. This is the example in my book: 3% increase, 103/100, 1+0.03 So I understand how to do single digit numbers, like 8, but ...
*February 19, 2009*

**s.s**

What are some synonyms for one and another?
*February 13, 2009*

**5th grade**

how do you get rid of bad luck?
*February 13, 2009*

**s.s**

LOL!!!!!!!!
*February 13, 2009*

**s.s**

Please tell me all you know about Singapore!
*February 13, 2009*

**s.s**

why does singapore have so many religions?
*February 13, 2009*

**s.s**

What kinds of cars do they export in singapore?
*February 13, 2009*

**French**

what does wee wee mean?
*February 13, 2009*

**s.s**

What is singapore known to export?
*February 13, 2009*

**Algebra**

Write a system of inequalities to describe the shaded area of the graph. This is the question on my homework today that i just don't get. My teacher said to use point slope form. y=y1+m(x-x1) The coordianate points of the triangular area are line 1: (2,1),(7,9) line 2: (7,...
*February 12, 2009*

**Algerbra**

actually wait, that gives you a negative answer......hmmm.......... Maybe you should disregard my work, but i know for a fact that you make a system the way i did. sorry.
*February 12, 2009*

**Algerbra**

Make a system. let r represent records, and t represent tapes. your system should be: {2r+3t=$31 {3r+2t=$29 I suggest using elimination. muliply ALL of the second equation by negative 3. -3(3r+2t=$29 you'll get: -9r-6t=-$87 Then multiply the first equation by a positive 2...
*February 12, 2009*

**5th grade**

how do you write a ten paragraph essay?
*February 12, 2009*

**algebra**

Convert 5 hours to minutes first, and then divide by 4, and multiply by two.
*February 11, 2009*

**math**

To change a decimal into a fraction, you have to use the actual decimal place.(tenths, hundredths, thousandths etc.) For example, 0.75 The 5 is in the hundredths place, so you put 75 OVER 100. Then reduce(unless instructed not to)
*February 11, 2009*

**Algebra S.O.S**

thank you oh so very much! <3
*February 11, 2009*

**Algebra S.O.S**

I've been working on this a while, and I thought I got it right...until I got to step two. When I tried "veryfying my solution point" The lines didn't intersect at (4,2). I don't know, it's probably a silly little mistake on my part, but I can't ...
*February 11, 2009*

**EASY**

IN SINGAPORE MONEY WHAT COLAR STANDS FOR WHAT?
*February 10, 2009*

**NAILS**

NAIL FILER OR CLIPPER
*February 9, 2009*

**S.S**

WHAT IS THE MONEY CALLED IN SINGAPORE?
*February 9, 2009*

**EASY**

WHAT IS THE MONEY IN SINGAPORE CALLED?
*February 9, 2009*

**science**

Could some one please list the scientific names for vertebrates and inveretebrates?
*February 6, 2009*

**english paper**

yes.
*February 6, 2009*

**science**

does anyone know of a few invertebrates,and vertebrates they could tell me about?
*February 6, 2009*

**science**

they have very bad deseses', if a carnivore eats one it will die. from katy a fifth grader
*February 6, 2009*

**English**

oh I got a terrible hard question for homework and got any qlue how to start it and develop and etc thats it: i ave to write a "debate" to analyse the role of media in Irish society my english teacher gave us pros and cons how to start? and how to match all of this? ...
*January 24, 2009*

**English**

i have to write a "debate"... that media has too much power in Irish society...
*January 24, 2009*

**English**

ok thats not helping...
*January 24, 2009*

**English**

I ve got that question recently and also have no qlue how to answer... how to start that is the question... if someone know just write I would be really gratefull :)
*January 24, 2009*

**algebra! help!**

ok thank you so much!!!
*November 20, 2008*

**algebra! help!**

In 1994 school lunch was $1.20. In 1999 it increased to $2.25. FInd the rate of change for school lunch from 1994-1999
*November 20, 2008*

**algebra 1`=**

for a person 6 feet tall who weighs 200 pounds find a value for k in the equation w = kh^3
*November 1, 2008*

**biology help!**

how is energy stored and released using ATP?
*October 21, 2008*

**biology**

where is the engery stored and released using ATP?
*October 21, 2008*

**5th grade math**

it cost $0.38 to produce and mail a newsletter.each week,475,000 newsletters are mailed to subscribers. about how much does it cost to produce and mail the newsletter each month
*October 7, 2008*

**english 1**

ok thank you so much!
*October 6, 2008*

**english 1**

wouldnt the verb be require in the following sentence: Do both surfing and snow skiing require coordination and balance more than strength?
*October 6, 2008*

**english**

ok thank you.
*October 6, 2008*

**english**

What is the verb of this sentence? Velma will not only bring the salad but also bake the bread.
*October 6, 2008*

**math**

i need an inequality and how many more boxes of oranges he will need to make up the difference.
*October 2, 2008*

**math**

A farm sells boxes of oranges for $8 and boxes of grapefruits for $12. The farm wants to ear at least 4,000. If he sells 210 boxes of oranges and 150 boxes of grapefruit will he earn at least $4,000? If not how many more boxes of oranges must he sell to make up the difference...
*October 2, 2008*

**4th grade science**

Ha, I am having trouble with science can you give me some pointers?
*September 25, 2008*

**math**

a number is divided by 3 and then 7 is added to the quotient. The result is 11. Find the number
*September 15, 2008*

**Science**

I need help with my science class. My teacher wants us to come up with property tests for many different substances to indentify them. I need three property tests for: Coal, Rope, Cloth, Plastic, Paper, Bean, Copper Granuals, Sand, Flower Petal and Rubber. Can you help me find...
*June 9, 2008*

**statistics**

Using the z-table (Table E) find the critical value (or values) for a = .018 left tailed test.
*April 29, 2008*

**math riddle ALGEBRA WITH PIZZAZZ**

4y-9=15 +9 +9 -- -- 4y+0=24 ÷4 ÷4 -- -- y = 6
*April 6, 2008*

**Humanities**

Wow! Thanks
*March 25, 2008*

**Humanities**

Is there a way to fix the current economy since it is not doing too well right now, or is just going to fail?
*March 25, 2008*

**Environment.. again**

I'm stumped with another question too. Can petroleum fractions be separated at room temperature on the basis of their viscosities? I would guess that they could but i don't know how to explain it
*March 24, 2008*

**Environment**

Why is the density of oil a key factor with oceanic spills and fire? I can't find the answer in my book
*March 24, 2008*

**Math Nightmare**

use the trapezoidal rule with the scale so its height =1, so (1/2) (1.5+ 2*1.6+ 2*1.8+ 2*1.9+ 2*2.0+ 2*2.1+ 2.1) which equals 11.2 so 119/11.2= 10.625 or 10.63 and that is the answer
*March 13, 2008*

**Chemistry**

Oh.. well we haven't learned the shorthand configuration yet so really don't know if my answer is correct or not
*March 10, 2008*

**Chemistry**

The electron configuration for Europium? I think it's 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f7 Is that right? I'm not sure if I did it right with the f block.
*March 10, 2008*

**math**

trying to find a fraction riddle. I'm a fraction greater than 1/2 and less than 3/4. My numerator is 5 times 1. what fraction am I? How do you explain the answer?
*March 10, 2008*

**Science**

What is a good science project to do? I am in 8th grade and am studying earth science. I need to present the project in front of class. Im really nervouse.
*January 27, 2008*

**Math**

l,l;
*January 12, 2008*