# Posts by anna

Total # Posts: 2,680

**Organic Chemistry**

An impure sample contains 0.95g of benzoic acid and 0.05 of salicylic acid. Solubilities in water of the two compounds are given in the following table. Solubility at 20 degrees (g/10mL) benzoic acid: 0.029 salicylic acid: 0.22 Solubility at 100 degrees (g/10mL) benzoic acid: ...

**Fine Arts**

Thank you. Its in that category for my class. Do you know where i could find the influences upon Jack Kirby and Joe Simon??

**Fine Arts**

I am doing a report on the original comic book Captain America. I need to know the author, publishing date, info that pertains to the comic. Does anyone know where i can find it?

**physics**

a hydraulic lift is designed for a gain of 100, so that a 10 N force applied at theinput piston will produce a force of 1,000 N at the output piston. If the radius of the input piston is 2 cm, the radius of the output is a) 200 cm, b) .02 cm c) 400 d) 20 e) .05

**physics**

a cube of side L is made of a substance that is 1/4 as dense as water. WHen placed in a calm water bath the cube will a) float with 1/2 L abovethe surface b)sink to the bottom, c) float with 1/4 L above the surface d) float with 1/4 L below the surface e) float with 3&...

**Chemistry**

If 0.273 moles of ferrous ammonium sulfate (Fe(NH4)2(SO4)2 . 6H2O) and an excess of all other reagents are used in a synthesis of K2[Fe(C2O4)3] . 3H2O, how many grams of product will be obtained if the reaction gives a 100% yield? Please help i found the molar mass of (Fe(NH4)...

**Science**

If .275 moles of ferrous ammonium sulfate (Fe(NH4)2(SO4)2. 6H2O) and an excess of all other reagents are used in a synthesis of K3[Fe(C2O4)3].3H2O, how many grams of product will be obtained if the reaction gives a 100% yield? Can someone help me solve this I found the molar ...

**History**

I have to write three major events or ideas from the book Tortilla Flat by John Steinbeck. I don't really know what could be considered as a major event. I know one can be that Danny died, falling into a ditch while he was drunk. Im not sure what else to write. Please help.

**math**

if the input is 24 what is the output? the table is: the input table: x,4,8,12,16 the output table is: y,1,2,3,4

**math**

If tan(xy) = x, then dy/dx =

**world history**

A strong, efficient government helped to unite Charlemagne's empire.

**Science**

Umm....... Do you mean, like, what I would do if I did the experiment again? What I would do to improve the experiment?

**Science**

For my science project, it says to write a "Future Research" section to go on the board. Could you just explain to me what exactly goes in that section? I'm so confused!

**algebra**

How do I graph the function f(x)+1/4x+4?

**Need help**

Studies have demonstrated that "latchkey children"

**math**

what is the area of a rectangle that is 3 yards wide by 8 yards long?

**History**

I need to list 3 problems of the colony that Stephen Fuller Austin founded. I have two of the three- -no food -bad indian relations I need one more!

**Math**

2x^2+8x=-5

**chemistry**

b) no reaction in the dark

**chemistry**

A) CH4 +Br2 sunlight-> CH3Br + Br

**Science**

So I'm in 7 grade and doing a science project. I have a question: What does it mean when it says: RESEARCH? I am required to have this on my board. Does it mean what I looked up to help me on this project? Also, what does it mean when it says: DATA? Do I just summarize ...

**Chem**

Rank thefollowing elements in order of decreasing atomic radius. N, B, Be, Li? I thought it was N, B, Be, Li

**Math-Help please?**

Michael owns 300 shares of a certain stock. Suppose the price of the stock drops by $4 per share. Write a multiplication equation to find the change in Michael's investment. I put 300x(300x[-4]) is that right?

**algebra**

welcome! :)

**algebra**

yeah you are right, the lines mean absolute value, which is the numbers distance form zero. -25's distance form zero is 25, so you would put 25.

**algebra**

the dimensions are 6m by 8m

**math**

for the polynomial shown below, find f(-1). f(x)=3x^4-x^3+4x-2

**Math**

Based on its degree, what kind of polynomial is this? h(x)=-x^2+2x-5

**english**

Please could you help me with 6 words with silent letters ...please

**physics**

a pet truck is moving at 25m/s north, a dog inside moves at 1.75 m/s at angle 35 degrees east of north. What is the velocity of the dog relative to the road?

**Math**

What is the volume of a sphere with a radius of 7 cm? Use 22/7 as pi.

**chem**

Suppose that the microwave radiation has a wavelength of 10.8cm . How many photons are required to heat 295ml of coffee from 25.0 C to 62.0 C? Assume that the coffee has the same density, 0.997g/ml , and specific heat capacity, 4.184J/(gk) , as water over this temperature range

**english**

why do u think Edwards felt it was necessary to terrify his puritan audience into action?

**Math**

A television station has 28 new TV shows scheduled to air this week. What fraction of the television shows, in simplest form, are 30-minuet programs?

**chemistry**

Calculate the molarity of the commercial bleach before it was diluted. bleach 6.25%

**chemistry**

Calculate the molarity of the commercial bleach before it was diluted. bleach 6.25%

**physics**

water at 20°C has viscosity n=1.0*10^-3 Ns/m^2. sand grains have density 2400kg/m^3. suppose a 1.1 mm diameter sand grain is dropped into a 51m deep lake whose water is a constant 20°C. If the sand grain reaches terminal speed almost instantly (a quite good ...

**Chemistry**

Fhd8enrn d dnsnsnnejj ej

**physics**

A 747 jetliner lands and begins to slow to a stop as it moves along the runway. If its mass is 3.5 x 10 exponent 5 kg, its speed is 27.0 m/s and the net braking force is 4.30 x 10 exponent 5 N, (A) what id its speed 7.50 s later? (b) how far has it traveled in this time?

**chemistry**

and what is the theoretical yield?

**chemistry**

a student set up a reaction with 0.2905g of cholesterol and 0.13g of nonanoyl chloride in excess triethylamine, and collected 0.0244g of solid product. what is the actual yield (in grams) of cholesteryl nonanoate? explain how to do this please :)

**calculus**

thanks!

**calculus**

Find all values of 'a' such that y=a/(x−9) and y=x^2−18x+81 intersect at right angles. show steps please :)

**MATH**

A town decides to build a playground using one of the existing walls beside an elementary school. What is the maximum area they can enclose using only 100ft of donated fence?

**physics**

Suppose a 46-N sled is resting on packed snow. The coefficient of kinetic friction is 0.11. If a person weighing 625 N sits on the sled, what force is needed to pull the sled across the snow at constant speed?

**science**

How does the Kinetic Theroy of Heat explan Solids, Liquids, and gasses?

**science**

What is the difference in Thermal Energy and Heat.

**Phyisical science**

How much energy is in a soccer ball that is moving at 3 m/s and has a mass of 2kg.

**chemistry**

A 48 g sample of water at 98.°C is poured into a 55 g sample of water at 15°C. What will be the final temperature of the mixture?

**Please check drwls**

1.C 2.d 3.A I don't know is it correct.

**Chemistry**

What would be the products of this chemical reaction?? Co(NO3)2 (aq) + NH3 (aq) = ?????? a precipitate is supposed to be formed.

**chemistry**

CH3OH(g) ----> CO(g) + 2H2 (g) (delta H =+90.7k) A) is heat absorbed or released in the course of this reaction? b) calculate the amount of heat transferred when 45.0g of CH3OH(g)is decomposed by this reaction at constant pressure. c) for a given sample of CH3OH, the ...

**chemistry**

72g

**accounting**

Describe the relationship of the financial statements used in the financial plan for 2010 for Patton-Fuller Community Hospital.

**Chemistry**

Which of these is best described as an acid-base reaction? KCl + NH4NO3 = KNO3 + NH4Cl NH3 + H2O = NH4 + OH

**Chemistry**

Which of these is best described as an acid-base reaction? KCl + NH4NO3 = KNO3 + NH4Cl NH3 + H2O = NH4 + OH

**Chemistry**

Which of these is best described as an acid-base reaction? KCl + NH4NO3 = KNO3 + NH4Cl NH3 + H2O = NH4 + OH

**Chemistry**

Which of these is best described as an acid-base reaction? KCl + NH4NO3 = KNO3 + NH4Cl NH3 + H2O = NH4 + OH

**Science**

a question regarding Universal Law Of Gravitation. If the clouds are 50 km. high , what is its proportional distance to a globe which is one foot in diameter ? Thank you :))

**Economics**

I'm trying to research for a paper about why we shouldn't have flat tax rate, and a reason that i'm seeing people putting online, is that a flat tax rate of say, 18% would decrease tax revenue? Can someone explain how? I don't understand how taxes work.

**improving it without changing its overall meaning**

Ever been assigned to work on a group project for class! Many students dread group projects: because one student typically does most of the work. Unfortunately for some, group work does not end when students leave school, many employers use teams to accomplish ongoing ...

**science**

A 4.3 "kilo" bag of sugar is on a counter. How much work is required to put the bag on a shelf a distance of 0.43 m above the counter?

**math**

draw a diagram to show how to find the solution 2.6 / 0.4 explain what the quotient means

**Math**

Pedro says the next expression in the following pattern is n+17,n+18,n+15,n+16,n+13,n+14._____ . Explain his error and write the correct expression.

**Politics**

I'm writing a speech, and it's about the topic "Private sector investment is preferable to public sector investment for Human Space Exploration" I'm on the con side for this argument, and one of my reasons was that public sector will spur cooperation, ...

**physics**

A 747 jetliner lands and begins to slow to a stop as it moves along the runway. If its mass is 3.5 x 10^5 kg, its speed is 27.0 m/s and the net braking force is 4.30 x 10^5 N, (A) what id its speed 7.50 s later? (b) how far has it traveled in this time?

**HELP!!!!!!!!!GEOMETRY!!!!**

THANK YOU

**HELP!!!!!!!!!GEOMETRY!!!!**

WHAT IS THE PERIMETER OF A SQUARE WHOSE VERTICLES ARE A(-4,-3), B(-5,1), C(-1,2), AND D(0,-2)?

**Computer Science**

An advertising agency wants to send a letter to all of its clients announcing a new fee schedule. The clients' names are in several different lists (arrays). The company merges the various lists to form one array, but clients could be listed in the array more than once. ...

**algebra**

Ms. Sue, I apologize, but all I'm getting is answers, I need to know how to work them out myself as my teacher didn't make himself clear.

**algebra**

how do i simplify -10 - (-7n) + (-9n)

**AP Biology**

What is important for reproducing animals? i don't exactly understand the question, help!!

**stats**

women age 20-29 is 36ml staandard deviation 7ml. What is probability greater than 45ml and between 30 and 62 ml

**algebra**

3 (x-8)

**algebra 1**

What is the "quotient" of 19 and m?

**Math**

Solve for a: a^-1 + b^-1 = 1

**Math**

Thank you so much! What I did wrong was pluck in the wrong equation

**Math**

A line has a slope of m = -1/3 and passes through the points (-4,k) and (2,3). Fine the value of k

**Math**

Solve for x: 6/x + 8/9 = 10/3x

**calculus**

(a) Modifying the parametric equations of a unit circle, find parametric equations for the ellipse: x^2/a^2 + y^2/b^2 = 1 (b) Eliminate the parameter to find a Cartesian equation of the curve x=2sint; y=4+cost; t >(or equal to) 0

**Precalc(attn Bobpursley)**

Hi i posted this before but I wanted to ask Bobpursley a few questions on his reply 1)For the first function you used cosine when they ask for sin, why is that? Also why did you put .5 in the beginning and end of the function? 2)For the second question why did you put 10 in ...

**Precalc**

okay sorry last two questions! I promise! The sun always illuminates half of the moon’s surface, except during a lunar eclipse. The illuminated portion of the moon visible from Earth varies as it revolves around Earth resulting in the phases of the moon. The period from a...

**Precalc**

of course! thanks!

**Precalc**

Okay for this question I know I am supposed to use the law of sines. But how can i tell what side is what? In right triangle ABC, a = 120 and c = 140, and ÐC is the right angle. Solve the triangle. Round to the nearest tenth, if necessary.

**Precalc**

oh I see thank you very much I totally get it now

**Precalc**

How do you know to use cos and not sine?

**Precalc**

oops sorry never mind

**Precalc**

where did the 12 come from?

**Precalc**

I am having trouble figuring out this question Jan observes a buoy bobbing up and down through a total amplitude of 8 feet. Beginning at the top of the wave, if the buoy completes a full cycle every 8 seconds, what is the height of the buoy relative to its lowest point after ...

**math**

Thanks hon!

**math**

(f-g) (fx)=1/x+2 g(x)= 3x I got -3x^2-6x+1/x+2 is this correct?

**Precalc**

Hello I need help with this question. I know that the formula for angular velocity is w= theta/time. I also know that the answer is 750 rpm. I am just not sure how to get that answer A truck driver travels at 58 miles per hour. The truck tires have a diameter of 26 inches. ...

**calculus**

The integral of sinx is from 2pi to infinity

**calculus**

Recall that a function G(x) has the limit L as x tends to infinity, written lim(x->infinity)G(x) = L, if for any epsilon > 0, there exists M >0 so that if x > M, then |G(x) − L| < epsilon. This means that the limit of G(x) as x tends to infinity does not ...

**integral**

thanks

**integral**

complete the integral e^(x^1/3)

**english**

Assembly

**chemistry**

i don't know

**Alg 2**

a rectangular picture frame measures 8 inches by 4 inches. You want to triple the frame's area by adding the same distance, x, to the length and width. Find the value of x and find the new dimensions of the frame. How do you do this?? Please show work

**MicroEcon**

The market for apple pies in the city is competitive and has the following demand schedule: Price Quantity Demanded $1 1,200 2 1,100 3 1,000 4 900 5 800 6 700 etc... 13 0 Each producer in the market has fixed costs of $9 and the following marginal cost: Quantity Marginal cost ...