Tuesday

February 21, 2017
Total # Posts: 44

**Chemistry**

E=hc/lambda How would I rearrange this to be able to solve for the other variables (c or lambda)??????? Please and thank you.

*November 29, 2016*

**spelling**

The film was about an outlaw in the Old West.

*November 29, 2014*

**math**

Erin buys a bag of peanuts that weighs 3/4 lb later that week the bag is 2/3 full. How much does the bag of peanuts weigh now?

*October 21, 2014*

**Spanish Proofread**

Thank you :-)

*September 15, 2008*

**Spanish Proofread**

Please help me proofread my spanish essay (so far). Thanks sooo much!! El sueño americano no existe solo para los pobres. No existe solo para los emigrantes. No existe solo para la joven. La idea del sueño americano es una que es conocida por todo el mundo. ...

*September 15, 2008*

**Physics**

Thank you for your help! :)

*April 20, 2008*

**Physics**

So the cars will reflect blue light, but since no blue light is being emitted, they won't look blue? Since yellow light is a combination of red and green light, no blue is involved. One will not be able to see the police cars??? Thank you for your help!! :)!

*April 20, 2008*

**Physics**

I am confused as to how light would work in the following question: Some very efficient streetlights contain sodium vapour under high pressure. They produce light that is mainly yellow with some red. Should a community having these lights buy dark blue police cars? Why or why ...

*April 20, 2008*

**Physics**

Thank you!

*November 12, 2007*

**Physics**

This is probably a really easy question, but I just don't know how to set it up. An object in equilibrium has three forces exerted on it. A 33 N force acts at 90 degrees from the x-axis and a 44 N force acts at 60 degrees. What are the magnitude and direction of the third ...

*November 12, 2007*

**Algebra**

You're welcome. If you think about it, it makes since why you got the same answer. The way you did it was right, just not the method they were asking for. There is never just one way to do things in math. :-)

*November 12, 2007*

**Algebra**

Both sets of answers are correct. I only wonder if in the second one, you should have used the sq. root property. If you did it that way you would get the exact same answer. I just don't want you to get marked down for not following directions. here's how to do it ...

*November 12, 2007*

**exponential equation-Algebra**

Alright. I think I might have gotten the answer. Write back and tell me if you think it's right. If you think I messed up, I'll keep trying. First use ln to rearrange the original: 4^(x+4)=5^(2x+5) ln4^(x+4)=ln5^(2x+5) Put the exponents in front because of the ...

*October 26, 2007*

**Algebra-please check my answers**

9^(x - 9)/8= sqrt of 9 i got 13 Correct! ______________________ 4^(x + 10) = 8^(x - 6) i got 38 Correct! Here's my work: 4^(x+10)=(2^2)^(x+10) 8^(x-6)=(2^3)^(x-6) 2(x+10)=3(x-6) Distribute 2x+20=3x-18 -x=-38 x=38 ______________________ Solve the exponential equation. ...

*October 26, 2007*

**math/algebra**

Well for one thing, we know f(x) is equal to y. It is the original function. For f(x)=3x^2 -5 We want to find the y value when x=-4 So just plug in -4 for all the x's and get the y value. f(-4)=3(-4)^2-5 f(-4)=3(16)-5 f(-4)=48-5 f(-4)=43 f(-4)=43=the y value at x=-4 So for...

*October 26, 2007*

**math.algebra**

First you have to realize that: square root 12x^3/5 and (12x^3/5)^1/2 are equal! :-) Taking the square root of a value is the same as taking the value to the 1/2 power Use this rearrangement to simplify: (12x^3/5)^1/2 Multipy the exponents... 12x^3/10 I'm pretty sure that...

*October 26, 2007*

**AP Calculus**

Thanks for your help! :-) I think I got the answer! Thanks1

*October 7, 2007*

**AP Calculus**

I need to find the integral: int:(x^2+2x+3)/(x^3+3x+9) dx I think I am supposed to use the rule: int:1/u du=ln|u|+C But I don't know what to do first. Thanks for your help! :-) Oh- and the answer the back of my book gives is (1/3)ln|x^3+3x^2+9x|+C

*October 7, 2007*

**Physics**

Allright. Thanks for your help! :-)

*September 23, 2007*

**Physics**

The water used in many fountains is recycled. For instance, a singel water particle in a fountain travels through an 85 m system and then returns to the same point. What is the displacement of a water particle during one cycle? I don't know where to start. It seems like ...

*September 23, 2007*

**Chemistry**

Matter is any substance which has mass and takes up space. Since air meets these requirements, it is classified as matter. Though air may not seem to take up space, it really does. If you put a baloon full of air underwater in a tank, what happens to the air? It stays in the ...

*September 5, 2007*

**Calculus**

Thanks so much. I get it now.

*September 3, 2007*

**Calculus**

Only one question: How did you get -1 from -theta ? Thanks so much!

*September 3, 2007*

**Calculus**

I need to find the slope of the graph of the function at the given point. Function: f(theta)=4sin(theta)-(theta) Point: (0,0) I tried finding the derivative of the function at theta=0, but I got 0 for an answer. I checked the answer in the back of my book and it is 3. I just ...

*September 3, 2007*

**English- Great Expectations**

Thanks so much for all your help everyone. I really appreciate it. I think I've got it all figured out now.

*August 28, 2007*

**English- Great Expectations**

I'm sorry, that just helped explain the plot. The problem is that I need to write 3 journals about this: 1- What does Pip learn in the first "expectation" of his life? How is this helpful to him, both at the time he learns it and later on in the novel? 2- What ...

*August 28, 2007*

**English- Great Expectations**

In "Great Expectations", what are Pip's three expectations? I am thinking that his first expectation might be being a blacksmith like Joe. His second could be becoming a gentleman. The third could be his adult life. I'm just not sure, and I feel like I am ...

*August 28, 2007*

**math?**

If nights=n and she sleeps 8 hrs for every n... then you would need to multiply 8 by the number of nights to find the total amount of sleep she got. So X total hours of sleep=8n or x=8n

*August 26, 2007*

**math**

I think it might be "subtotatl". Check the vocab list in your book if there is one.

*August 26, 2007*

**Math- Calculus**

Sorry in advance-- I don't know how to find the answer, but I'm willing to help all I can. First, rearrange the equation of the line to make it y=-3x-1. Since we need to find a line parallel to this one, we know it needs a slope of -3. y=-3x-1 y=mx+b m=slope m=-3 What ...

*August 26, 2007*

**Calculus**

Thanks so much for all your help. I figured it out. --Cori

*August 24, 2007*

**Calculus**

How would I go about finding the derivative of f(x)=ln(x)(7x-2)^3 first=ln(x) second= (7x-2)^3 Would I do first times the derivative of the second + second times the derivative of the first? If so, what is the derivative of lnx? I'm confused. Thanks for your help. --Cori

*August 24, 2007*

**Calculus**

So I would write the Vertical Asy answer... x=0+(pi)n correct? since 180=pi and it can be added "n" number of times please let me know if this is the correct notation thanks so much for your help --Corin

*August 24, 2007*

**Calculus**

How would I go about finding the vertical and horizantal asymtotes (if any) of the function f(x)=cscðx? Thanks for all your help. Corin

*August 24, 2007*

**algebra**

Ooops, Sorry DrBob. I didn't realize you had already answered.

*August 23, 2007*

**algebra**

Try using PEMDAS to help you remember the order of operations. P-Parentheses E-Exponents M-Multiplication D-Division A-Addition S-Subtraction Do you have any parenthesis? No. Are there any exponents? No. Any Multiplication? Yes. Start there. -3*2x = -6x Now the problem reads...

*August 23, 2007*

**spanish**

I suggest trying to repeat after someone that does have a spanish accent. Listen to spanish music for starters. It's fun and when you sing along your accent is improving! :-) Audiobooks are also a good idea. I'm sure you will get better in no time. Buena suerte! Good ...

*August 23, 2007*

**Math**

How can I find the point of intersection of the graphs x^2=y=4 and 2x-y=1 by hand? I can do the problem using a calculator, but I don't know how to do it by hand. I tried using substitution, but I ending up getting x^2+2x-5=0. It would not factor evenly. Should I use the ...

*June 28, 2007*

**Resume**

Is the commment placement correct in the first part of my resume? OBJECTIVE To attend an excellent college or university that will provide a challenging course of study in world cultures and languages, with a study abroad program to enrich my knowledge of the Spanish and ...

*June 9, 2007*

**Pre-Calculus**

As a balloon in the shape of a sphere is being blown up, the radius is increasing 1/pi inches per second. At what rate is the volume increasing when the radius is 1 inch? I know that the volume of a sphere = 4/3(pi)r^3 I don't know what to do next. Figure dV/dt dV/dr *dr/...

*May 30, 2007*

**Pre-Calculus**

How can the following two identities be verified? 1. (cos^2y)/(1-siny)=1+siny 2. sin^2a-sin^4a=cos^2a-cos^4a Thanks! change cos^2a to 1-sin^2a=(1-sina)(1+sina) Thank you. I figured out the first one with your help, but I'm still stuck on the second. Any tips?

*May 20, 2007*

**Pre-Calculus**

How do you verify: 1.) sinxcosx+sinx^3secx=tanx 2.) (secx+tanx)/(secx-tan)=(secx+tanx)^2 I tried starting from the left on both problems, but am stuck. like I said before, change everything into sines and cosines. for the first one: LS= sinxcosx + (sin^3x)cosx =(sinxcos^2x + ...

*May 4, 2007*

**Pre-Calculus**

How can this identity be proved/verified? cscx-sinx=1/(secxtanx) I have tried starting on both sides of the equation to get to the other. By starting on one side of the equation and manipulating it to make it look like the other side, the identity will be proved. However, this...

*May 3, 2007*

**Chemistry**

How can I react methanol (CH3OH) with silicylic acid (C7H6O3)to produce methyl salicylate (C8H8O3)? I am trying to find the chemical equation. So far I have this: CH3OH+C7H6O3->C8H8O3+? It is easier to see what is happening if you draw the complete structures. It is hard on...

*May 2, 2007*

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