Monday

February 27, 2017
Total # Posts: 493

**Inorganic Chemistry**

Use Slater's rules to calculate the effective nuclear charge, Z* or Zeff, for a 4f electron in Eu, Tb, and Dy.

*February 2, 2015*

**Column Chromatography**

If you have 5.6 mL of 95% hexanes to 5% ethyl acetate, how many mL of 85% hexanes to 15% ethyl acetate can you make? Assume unlimited supply of pure ethyl acetate.

*February 2, 2015*

**Math**

What is the mean absolute deviation of 640 250 500 640 720 640 250 720

*December 7, 2014*

**math**

5/7 times9/10

*November 22, 2014*

**math**

1/3 divided by 5/8

*November 22, 2014*

**math**

somebody please help me

*November 22, 2014*

**math**

4/5 times 3/4

*November 22, 2014*

**math**

4/3 times 3/4

*November 22, 2014*

**History(Checking Answers)**

Thanks , Okay so is it Northeast? and For the first answer Climate that supported a large agricultural base..

*November 18, 2014*

**U.S, History**

You're welcome.

*November 18, 2014*

**U.S, History**

I believe its C

*November 18, 2014*

**English**

How can I make this sentence present tense? Or is it already present tense? The problem I'm having is with the word "banished" which is past tense. And my teacher wants us to write in the present tense. I have the main verb present so does that make the whole ...

*November 9, 2014*

**AP Chem**

NO2 + H2 <-> NO + H2O [H2] = .30 mol/L [NO2] = .20 mol/L [NO] = [H20] = .70 mol/L @ 1000K A. What is the mole fraction of NO in the equilibrium mixture? B. Calculate Kc C. Determine Kp in terms of Kc D. If system is cooled to a lower temperature, 35% of NO is converted ...

*October 28, 2014*

**English composition**

I'm writing a paper to explain a concept of the bevel Ella Minnow Pea. I've come up with a thesis statement and my teacher has approved it, but I'm just stuck as to what I'm writing about. The assignment instructions asks "How does Dunn legitimize his ...

*October 26, 2014*

**Ed Tech**

1.) B 2.) D 3.) A 4.) A Just as Harley said.

*October 13, 2014*

**English - grammar**

How to decide how to end a sentence with he/him or she/her? Ex. We can not eat before he? or him?

*September 30, 2014*

**Algebra**

Interval notation: (-7,3) If it was included (less than or equal to/greater than or equal to) you would use a bracket [ or ].

*September 30, 2014*

**physics**

A small relief package is dropped by a helicopter that is descending steadily at 2.0 m/s. a) After 2.5 s, what is the speed of the relief package? b) After 2.5 s, how is the package below the helicopter? I think I need to use the kinematic equations.

*September 28, 2014*

**Algebra1**

Umm can u please say something more specific

*September 22, 2014*

**Algebra1**

Which variable can you replace with a number 10a + 6c = $ 80 ❗️❗️❗️❗️❗️❗️❗️❗️❗️❗️❗️

*September 22, 2014*

**chemistry**

A room contains 47kg of air. How many kilowatt-hours of energy are necessary to heat the air in the house from 7∘C to 26∘C? The heat capacity of air is 1.03 J/g∘C

*September 10, 2014*

**chemistry**

Calculate the final temperature of 34mL of ethanol initially at 13∘C upon absorption of 938J of heat. (density of ethanol =0.789 g/mL)

*September 10, 2014*

**science**

what is the weight of the ethyl alcohol that exactly fills a 200.00 ml container? The density of ethyl alcohol is 0.789 grams/ml

*September 9, 2014*

**physics**

Watch this youtube video! "Relative Velocity Lesson 3 - Example 2"

*August 22, 2014*

**Math 11**

From a window in a building 20 m above ground the angle of depression of the top of a statue across the street is 30 degrees, and the angle of depression of the base of the statue is 34. How tall is the statue?

*June 8, 2014*

**Math 11**

From a weather balloon high in the air, the angle of depression of a ground marker is 27.8 degrees. If the balloon rises 345 m straight up the angle of depression from this higher point is 46.2 degrees. How high above the ground is the balloon?

*June 8, 2014*

**math**

THAT RIGHT\

*April 28, 2014*

**Physics**

A disk at rest experiences a constant angular acceleration for t = 85 s, at the end of which it is spinning with a frequency of f = 45 rpm. Please answer the following questions. A)Write an expression for the magnitude of the angular velocity of the disk after the acceleration...

*April 26, 2014*

**Math**

OH OK I TELL YOU

*April 26, 2014*

**Math**

F(x)=x^2-2x-3 plz help me slove this ? HELP ME I DO NOT UNDERSTAND THIS HELP ME PLZ

*April 26, 2014*

**math**

OH OK THANK YOU

*April 26, 2014*

**letter**

IS THAT A GOOD LETTER MS. SUE

*April 25, 2014*

**letter**

OK ITS JUST MY COMPUTER IT KEEP PUT DATE

*April 25, 2014*

**letter**

How can I write a feel better letter to Miley Cyrus? please help and give me so examples please help HOPE YOU FEEL BETTER [DateDear Miley cyrus I was quite upset to hear that you are feeling ill. However, I am every certain about you and i hope you will feel better in no time...

*April 25, 2014*

**letter**

HOPE YOU FEEL BETTER [DateDear Miley cyrus I was quite upset to hear that you are feeling ill. However, I am every certain about you and i hope you will feel better in no time. Please accept, then, my sincerest wish that you get better soon. we can meet each other some day ...

*April 23, 2014*

**letter**

hold on wrong letter

*April 23, 2014*

**letter**

this is a good letter to send to miley cyrus yes or no HOPE YOU FEEL BETTER [Date] [NAME, COMPANY AND ADDRESS, ex. Dear Miley cyrus I was quite upset to hear that you are feeling ill. However, I am every certain about you and i hope you will feel better in no time. Please ...

*April 23, 2014*

**letter**

How can I write a feel better letter to Miley Cyrus? please help and give me so examples please help

*April 23, 2014*

**ENGish**

1. What are the characteristics of an effective television newscaster? Explain. 2. Why are so many people over the age of twenty-one entering college? Discuss. 3. What could be done to make the public less hesitant to report crime? 4. Do Americans seem unable to relax in ...

*April 21, 2014*

**English**

It's C alex my brother sorry I meant its D that the right answer I think good luck my brother

*April 16, 2014*

**social studies check answers**

yeah what are the answers to 3 and 5 then

*April 16, 2014*

**social studies**

number 4 is b

*March 18, 2014*

**social studies**

Kyle you put 7 as D and 8 as C there really B and B.

*March 17, 2014*

**geometry**

The measure of an exterior angle of a regular polygon is given. Find the number of sides of the polygon? Given number is 72?

*March 3, 2014*

**Math**

In a right triangle, the measure of the legs are 20 and 3x, and the measure of the hypotenuse is 4x+1. Find the value of x.

*March 2, 2014*

**math**

Use 17 connecting cubes to make a kitchen model. Model is is the shape of rectangle and is one cube high. How many different ways to make the model?

*February 27, 2014*

**Math**

Find the measure of each angle to the nearest tenth of a degree. sin A=0.7245

*February 6, 2014*

**Math**

Find the measure of each angle to the nearest tenth of a degree. sin A=0.7245

*February 6, 2014*

**algebra**

If Will gives Molly $9 dollars he will have the same amount of money as her. If Molly give Will $9, the ratio of money she has to the money will has will be 1:2. How much money does will have in the beginning?

*February 5, 2014*

**cook**

I want to know wat all the weighing equipment is

*February 4, 2014*

**Math**

4x+16=x(x)-2x

*January 9, 2014*

**Math**

Solve for x and y 7x=2y 4x=y+2

*December 15, 2013*

**math**

Solve for x and y 4x-y=4 2y=3x+17

*December 15, 2013*

**science**

a misconception of the sun is stronger at sunrise and weaker at sunset

*November 19, 2013*

**social studies**

Thank you Leah lamb

*September 27, 2013*

**Math**

The question i'm having a problem with is the following: copy and complete: 3t-4 is a(n)_?expression and 5+13 is a(n)_? Expression. Do they mean a numerical expression?

*September 5, 2013*

**health**

it is B

*June 30, 2013*

**math**

The number of students at a university is 1320, and the number increases by 8% each year. Write an exponential function to model this situation. Then find about how many students there will be in 5 years.

*June 9, 2013*

**Chemistry**

bromine lol

*May 19, 2013*

**hyperbolas**

Find an equation for the hyperbola whose graph has vertices (+/-5,0) and foci (+/-7,0)

*May 7, 2013*

**hyperbolas**

Find the equation of the hyperbola that has a center at (8,1), a focus at (3,1), and a vertex at (4,1).

*May 7, 2013*

**parabolas**

Find the equation and sketch the parabola that has vertex V (-1; 0) and focus F(-4; 0).

*May 6, 2013*

**precalculus- ellipses**

Consider the ellipse y^2=1-6 x^2. Its vertices are (0,A) with A= ? its foci are (0,+/-B) with B= ? its eccentricity is ? the length of its major axe is ? the length of its minor axe is ?

*May 4, 2013*

**precalculus**

Consider the ellipse 9 x^2 + 36 y^2 = 64. the length of its major axe is ? the length of its minor axe is ?

*May 4, 2013*

**precalculus**

Consider the ellipse 9 x^2 + 36 y^2 = 64. the length of its major axe is ? the length of its minor axe is ?

*May 4, 2013*

**precalculus**

Find an equation for the parabola that has its vertex at the origin and directrix x=-9. If your answer is in the form x^2=Ay, then input here: A= if your answer is in the form y^2=Ax, then input here: A= .

*May 3, 2013*

**Biology**

YES IT IS REAL HARD

*April 29, 2013*

**statistics**

Your mail-order company advertises that it ships 95% of its orders within three working days. You select an SRS of 100 of the 5000 orders received in the past week for an audit. The audit reveals that only 91 of these orders were shipped on time. A) What is the sample ...

*April 24, 2013*

**precalc please help me**

If cos^4 3 x - sin^4 3 x = cos (g(x)), then g(x) = ??. For part (b), use a^4-b^4=(a^2-b^2)(a^2+b^2)!

*April 21, 2013*

**precalc**

(cos3x)^4+(sin3x)^4=cos(g(x)) find g(x)

*April 21, 2013*

**precalc**

(cos3x)^4+(sin3x)^4=cos(g(x)) find g(x)

*April 21, 2013*

**precalc**

(cos3x)^4+(sin3x)^4=cos(g(x)) find g(x)

*April 21, 2013*

**pre calc**

(cos3x)^2+(sin3x)^2=cos(f(x)) find f(x)

*April 21, 2013*

**pre calc**

Use the sum-to-product formula to simplify the expression: If sin 52 + sin 8 = sin A, 0<A<90, then A =??? degrees.

*April 21, 2013*

**pre calc**

((cos^4)6x)-(sin^4) 6x=cos(g(x)) find g(x)

*April 21, 2013*

**pre calc**

(cos^2)3x+(sin^2)3x=cos(f(x)) simplify expression and find f(x)

*April 21, 2013*

**Algebra**

As a promotion, a store draws the name of a customers each week. The prize is a coupon for the store. If winner is not present at drawing, he cannnot claim the prize and the amount of the coupon increases for the next weeks drawing. the function f(x)= 20(1.2)to the x power, ...

*April 21, 2013*

**Math**

Simplify and write the trigonometric expression in terms of sine and cosine: ((2+tan^2 x)/(sec^2 x))-1 = (f(x))^2 f(x)= ??

*April 14, 2013*

**Chemistry**

If you dilute 12.5 mL of a 3.5 M solution to make 213.8 mL of solution, what is the molarity of the dilute solution?

*March 27, 2013*

**Math**

Factor 4xsquared-36x+81=0

*March 26, 2013*

**Math/Physics**

Two kg of water at a temperature of 50 degrees C have 485.3 kJ of heat transferred from them, resulting in a mixture of ice/water at 0 degrees C. What is the composition of the mixture? This is what I did and would like verification of my answer. 2*4.183*-50 = -418.3 kJ I then...

*March 23, 2013*

**Math/Physics**

A quantity of water at 87 degrees C is cooled at a rate of 2844 MJ/h. After 40 minutes, the water has changed to ice, having a temperature of 243K. Calculate the mass of the water/ice. I know 243K = -30 degrees C I'm assuming I have to use my sensible and latent heat ...

*March 23, 2013*

**Math/Physics**

If 55034.175 kJ of heat are transferred to 150 kg of ice at a temperature of -12.15 degrees C, calculate the temperature of the resulting water. I know my formulas for sensible and latent heat but don't know how to approach this.

*March 22, 2013*

**CALCULUS**

For some positive constant C, a patient's temperature change, T , due to a dose,D , of a drug is given by T=(c/2-D/3)D^2 What dosage maximizes the temperature change The sensitivity of the body to the drug is defined as . What dosage maximizes sensitivity?

*March 6, 2013*

**Calculus**

Find constants a and b in the function f(x)=axe^(bX) such that f(1/8)=1 and the function has a local maximum at x=1/8.

*March 6, 2013*

**Physics**

A boat is pulled through a canal by horses walking parallel to the canal and exerting a force of 1000 N on a tow rope 40 meters long. If the distance from the boat to the horse track is 15 meters, what is the magnitude of the effective component pulling the boat forward?

*March 5, 2013*

**consumer math**

amy miller's insurance policy has a $218.00 premium for 25/100 bodily injury limits and $25,000.00 property damage limits. the collision premium is $74.00. amy's driving-rating factor is 2.4. what is her annual premium?

*February 25, 2013*

**Chemistry**

A compound of Tin Sulfate is decomposed in the lab to give 1.91g of Tin, 1.03 grams of Sulfur, and 2.06g Oxygen. Determine if this is a compound of Tin(II) Sulfate or Tin(IV) Sulfate.

*February 16, 2013*

**Physics**

A person standing at the edge of a seaside cliﬀ kicks a stone over the edge with a speed of 21 m/s. The cliﬀ is 52 m above the water’s surface. How long does it take for the stone to fall to the water? The acceleration of gravity is 9.81 m/s^2. Thanks!

*January 28, 2013*

**algebra**

Ahh makes much more sense when Reiny did it. I remember learning this in algebra. I have a tendency to give everything its own variable, which makes the problem impossible to solve i guess.

*January 17, 2013*

**algebra**

x + y = 1,100 a + b = 49 (x+5%) + (y+2%) = 1,149 That's all I could take from the question. Now how you solve and get the answer is beyond me.

*January 17, 2013*

**Proportions**

It just depends on how the problem is actually written. Is 3y-8 all over 12 or is 8 just over 12? Because I solved 3y - (8/12) = (y/5), not [(3y-8)/12]= (y/5)...its just all in how you type your question.

*January 17, 2013*

**Proportions**

y=5/21

*January 17, 2013*

**Literature**

Makes so much more sense now! Thank you! I looked up the definition of connotation, even though I thought I knew it, and that made it much easier to understand when I re-read it. You're right, storm is the big "problem" word!

*January 17, 2013*

**Literature**

Hmm, that's interesting how no teacher of mine ever thought to tell me that. So now my problem is how do I consider it as a 'whole'? and should i be looking at the words literally or figuratively?

*January 17, 2013*

**Literature**

The question is asking about problems in her life, so yes 'where the storm is over' could mean where the problems end when she dies, but i could also show that the other answers could say something about challenges in her life. "On this wondrous sea" could be...

*January 17, 2013*

**Literature**

Well if I had not read online that Emily Dickinson wrote a lot of poems about death, then I probably wouldn't have a clue to what it implies. However, I'll say it implies that "the storm" or the bad parts of her life is "o'er" or over or finished.

*January 17, 2013*