Wednesday
February 10, 2016

# Posts by katie

Total # Posts: 1,865

Chemistry
What is the change in internal energy of a system that releases 1275 J of heat to the surroundings and is compressed so that 235 J of work are done on the system?
March 11, 2011

english
thankyou so much that is so helpful
March 7, 2011

english
Im not sure on how to do my introduction on an essay for a school magazine giving your views on how people treat animals? can someone please help me thanks alot
March 7, 2011

Geography/History
sorry i was saying katilin
March 7, 2011

ENG
Choose the correct verb: Some people (know, Knows) more about their favorite TV characters than they do about the members of their own family. A) knows B) know
March 6, 2011

chemistry
A 6.0 L flask contains a mixture of methane, argon and helium at 45 degrees C and 1.75 am. If the mole fractions of helium and argon are 0.25 and 0.35, respectively, how many molecules of methane are present?
March 1, 2011

Math
The number of calls received by a car towing service averages 14.4 per day (per 24 hour period). After finding the mean number of calls per hour, find the probability that in a randomly selected hour the number of calls is 0
February 27, 2011

calculus
let f(x)=sqrt x+4. Calculate the difference quotient f(5+h)-f(5)/h for h=.1 h=.01 h=-.01 h=-.1
February 24, 2011

PRE-ALGEBRA
2V/5+V/4
February 22, 2011

Calculus
A retangular poster is to be made out of cardboard. The margins on the top and the bottom will be 2 inches. The margins on the sides will be 1 inch. The area of the poster devoted to the printed material must be 300 square inches. (a) to the nearest .001 inches, find the ...
February 17, 2011

algebra1
how do you slove x+3y=-30 9x-12y=3 with substitution and elimation
February 16, 2011

How many possible combinations for an 8-digit binary number are there? How did you get this an answer?
February 15, 2011

Chemistry
A square of aluminum foil measuring 3.20 inches on each side weighs 275 mg. The density of aluminum is 2.70 g/cm3. Find the thickness (in micrometers) of the foil.
February 11, 2011

algebra 2
find the average rate of change for the function f(x)=60x-3x^2 between x=6 and x=19
February 9, 2011

Science fair projets with fish
February 8, 2011

english
where did the jim crow laws take place? and why?
February 7, 2011

Calculus
The shape is a cone. The radius is 6 cm and the height is 9 cm
February 6, 2011

Calculus
If water is poured into a cup at a rate of 1 cubic centimeter per second, how fast is the dept of the water increasing when the water is 4 cm deep? r = 6 cm h = 9 cm V = 1/3(pie) r^2 x h V = (pie)r'h + 1/3 (pie)r^2 h' 6 / 9 = r / h 6h = 9r r = 3 / 4.5 h V = 1/3(pie) (3...
February 6, 2011

Calculus
Okay, I see what I did wrong. I did dy/dt = 6 instead of dy/dt = .5. Thanks a lot
February 6, 2011

Calculus
A street light is hung 18 ft. above street level. A 6-foot tall man standing directly under the light walks away at a rate of 3 ft/sec. How fast is the tip of the man's shadow moving? I know I would've to set up a proportion. 18 / 6 = x + y / y x = distance of man from...
February 6, 2011

Calculus
Two trucks start from the same point. One truck travels due east at a rate of 50 mph and the other trucks travels due north at a rate of 60 mph. At what rate is the distance between the two vehicles increasing 1 1/2 hours later? I think the answer is 55 mph because I added 60...
February 6, 2011

Calculus
The slope is actually -5. And forget I think i understand this now.
February 6, 2011

Calculus
In the diagram below, the y-coordinate of point P is increasing at a rate of 4 units per minute while point Q remains in its fixed position. Find the rate of change of angle, in radians per minute, when y = 20. y ^ | P (0, y) | | | | |---| |___|________ Q (4, 0) Then, P (0 , ...
February 6, 2011

calculus
Your welcome. Don't worry you'll do good in your studies, keep it up
February 6, 2011

calculus
For example, √x is the same as x^1/2, the derivative of √x is 1/2^ -1/2 equals to 1 / 2√x sqrt(3x) = sqrt(3)sqrt(x) and the derivative of this is sqrt(3)*derivative(sqrt(x)) = sqrt(3)/2sqrt(x), as d/dx (sqrt(x)) = 1/2sqrt(x). now, multiply the top and bottom ...
February 6, 2011

Managerial Accounting
A food division reported cost of sales-food of \$198,680. Employees' meals cost \$1,225, complimentary meals \$142 and transfers in were received from teh bar operaton with a cost of &82. Determine the net cost of sales.
February 6, 2011

alg and trig
6x^3-5x^2+15x+5 / 2x^2-x+3
February 2, 2011

science
how do u learn the skeleton bones in one night
January 31, 2011

is a noun to go with it
January 29, 2011

Chemistry
Calcium carbonate reacts with phosphoric acid to produce calcium phosphate, carbon dioxide, and water. 3 CaCO3(s) + 2 H3PO4(aq) Ca3(PO4)2(aq) + 3 CO2(g) + 3 H2O(l) How many grams of phosphoric acid react with excess calcium carbonate to produce 3.47 g Ca3(PO4)2?
January 27, 2011

Chemistry
I did follow those steps and they didn't work for the first problem.
January 27, 2011

Math
i don't know what you mean by infinity?? thanks for the other help (:
January 25, 2011

Math
btw, i dont know if i should switch the sign (greater than or less than) or if it should be negative! thank you
January 25, 2011

Math
i have no idea!!!!!
January 25, 2011

Math
-1/4k is greater than 18
January 25, 2011

math in topics
Wait time for a counselor is 60 minutes. There are five counselors and each counselor see a student for an average of 30 minutes per day. How many new counselors are needed to shorten the wait time to 15 minutes? Each counselor see 5 students per day totaling 25 students
January 25, 2011

math in topics
Wait time for a counselor is 60 minutes. There are five counselors and each counselor see a student for an average of 30 minutes per day. How many new counselors are needed to shorten the wait time to 15 minutes?
January 25, 2011

alg2
Solve: 3x − 7 (sqrt x) + 2 = 0
January 20, 2011

alg 2
simplify (x^3/4)^3
January 20, 2011

Social Studies
for class, my teacher is making us do a booklet of key terms that we need to know. We have to draw pictures for each key term. I need some ideas on what to draw for Articles of Confederation and Land Ordinance of 1785. please help!
January 19, 2011

Physics
a) 4% b) 0.4% c) 0.07%
January 17, 2011

HISTORY
(This homework question was removed due to a copyright claim submitted by K12 Inc.) You do NOT have to write me my paragraph, but what I would like is for you to answer each question next to a bullet-point so I can write my paragraph. For example, answer each of these ...
January 15, 2011

math
2x-3y=12 x=4y+1 substitution, elemenation
January 13, 2011

I need help finding heighth of a pyramid.
January 13, 2011

MT
Identify 2-3 business issues and provide an explanation of why technology cannot be used to aid or solve them.
January 12, 2011

algebra
thank you.
January 11, 2011

algebra
if a student has an average of 8 after 20 tests and then gets a 0 on his 21st test, what would his new average be?
January 11, 2011

Chemistry
If you start with ten grams of lithium hydroxide, how many grams of lithium bromide will be produced? Round to the nearest tenth. Don't forget the units.
January 9, 2011

social studies
This helped me a lot thank you so much!
January 6, 2011

Math
January 5, 2011

English
It's Relative Pronoun. David I is wrong because Demonstrative Pronouns are this, these, that and those.
January 4, 2011

physics
nina has a mass of 40 kg and bruno has a mass of 100 kg. they stand on a slippery surface and push off eachother. bruno has an acceleration of 1.0 m/s squared. what is nina's acceleration?
December 22, 2010

PHYSICS
santa drops a package from his sleigh while traveling at constant velocity. if there is no air resistance, with the package hit the ground in front of the sleigh, behind the sleigh, or directly below it? explain reasoning.
December 22, 2010

PHYSICS
does the sun exert a gravitational force on the earth? if so, why doesn't the earth fall into the sun?
December 22, 2010

PHYSICS
assume you have a mass of 100 kg on earth. on the moon, where the gravitation of the moon is 1/6 gravitation of the earth, what is your mass on the moon and what is your weight on the moon
December 22, 2010

PHYSICS
what are the components of a vector that has a magnitude of 1.5 m at the angle of 35 degrees with respect to the positive x axis
December 22, 2010

PHYSICS
Alex is doing tight circles with his car in an empty parking lot, all the while holding his speedometer reading to a steady 20 mph. Is Alex traveling at a constant velocity? Why or why not?
December 22, 2010

A reflecting telescope contains a mirror shaped like a paraboloid of revolution. If the mirror is 4 inches across at its opening and is 3 inches deep, where will the collected light be concentrated?
December 16, 2010

physics
as an object is dropped from a high cliff, which of the following statistics can be made in regard to the objects potential energy?
December 16, 2010

physics
A ship approaches saturn at 10.4km/s and saturns speed is 9.6km/s (relative to the sun). Take the interaction as elastic collision. Saturns mass is greater than the space ship. Find the speed of the ship after it goes around Saturn.
December 8, 2010

physics
ladder of mass m and length l leans against a frictionless wall at an angle of 60 degrees. The coefficient of static friction between the ladder and ground is 0.45. A man whose mass is 4 times the ladder climbs up. How far up the ladder can he go before he slips?
December 8, 2010

economics
what is the history on credit cards?
December 7, 2010

algebra 2
A flagpole at a right angle to the horizontal is located on a slope that makes an angle of 12 degrees with the horizontal. The pole's shadow is 16 meters long and points directly up to the slope. The angle of elevation of the sun is 20 degrees. Draw the triangle. Write an ...
December 7, 2010

If wind blows at a speed of 30 m/s over the roof of your house, what is the pressure diference on your roof between the air inside and the air outside? What net force does this produce on a roof having an area of 175 m^2? 1.3 kg/m^3 is the density of air.
December 5, 2010

Geometry
Point H is the midpoint I'd line segment GJ Line segment GH is 7x-5 HJ is 4x+1 what is the value of X?
December 5, 2010

Physics
For part c, you use the help Ewater+Eiron=the answer from part a. So this would be the set up: (4186*5*delta T)+(448*1.2*delta T)=0.7 20930delta T + 537.6delta T = 0.7 21467.6delta T = 0.7 delta T= 3.26E-5
December 3, 2010

organic chemistry
How would i construct a graph of refractive index versus percent 1-bromooctane for KI and KCl reactions
December 2, 2010

trig
Find the sign of the expression if the terminal point determined by t is in the given quadrant. cos t X sec t in any given quadrant
December 1, 2010

Math
How to solve the simultaneous equations 3x + y = 17 and y = x + 1 ?
December 1, 2010

College Algebra
ln 2+6 ln x+4 ln (x^2=8) How would I rewrite the expression? I'm struggling in Math.
November 30, 2010

physics
Suppose you roll a bowling ball at 2.5 m/s across the roof of a flat building. It leaves the edge and strikes the ground 2.0 s later. How high is the roof? How far from the edge of the roof does the ball hit the ground?
November 28, 2010

physics
Two spheres A and B, where A has twice the mas of B, are projected at the same horizontal velocity off the edge of two different height shelves. Sphere A leaves from a height of 2.0 m. Sphere B leaves a shelf 1.0 m off the floor. If both spheres leave the edge if the table at ...
November 28, 2010

psychology
Surveys suggest that up to 4% of the U.S. population suffers from generalized anxiety disorder. How are anxiety disorders viewed by various psychological perspectives such as psychodynamic, biological, cognitive, and humanistic? With which perspective do you most agree? With ...
November 23, 2010

Chemistry
If the reaction Fe2N(s) + 3/2H2(g) -> 2Fe(s) +NH3(g) comes to equilibrium at a total pressure of 1 bar, analysis of the gas shows that at 700. and 800.K, PNH3/PH2=2.165 and 1.083 respectively, if only H2(g) was initially present in the gas phase and Fe2N(s) was in excess. a...
November 23, 2010

ENGLISH
Did I use the word sublimate correctly in the following sentence? "His stories served as a way to sublimate his anger for his childhood and improve the conditions for nineteenth-century adolescence."
November 20, 2010

Chem
A chemical reaction in a bomb calormeter evolves 4.66Kj of heat. If the heat capcity of the calorimeter is 1.38 Kj/C what is the temperature change?
November 18, 2010

Calc
A 100 inch piece of wire is divided into 2 pieces and each piece is bent into a square. How should this be done in order of minimize the sum of the areas of the 2 squares? a) express the sum of the areas of the squares in terms of the lengths of x and y of the 2 pieces b) what...
November 16, 2010

Physics
A long straight horizontal segment of wire with 0.060 m traverses a west magnetic field with 2.0 T. If a south current with 4.0 A flows through the wire, which one of the following statements concerning the effect of the magnetic force on the wire is true. a) The wire will be ...
November 14, 2010

Geometry
1) Find the lengths of the legs of two possible triangles whose areas would be as close as possible to one square inch without going under. 2) What if the triangle has to be an isoceles triangle? (area must be close to one square inch) (Give answers in ruler-friendly form in &...
November 11, 2010

Math
How do you solve 3/4x+1/2y=10 and -3/2x-y=4?
November 10, 2010

algebra
what is 4p+3q=36 9p+6q=78 ?
November 10, 2010

math
Three numbers in an arithmetic sequence sum to six. If you add 1 to the first number, 2 to the second number, and 5 to the third number, the result will be a geometric sequence. What are the original 3 numbers?
November 8, 2010

Math
i need help with this problem if u know the answer coment the answer below
November 7, 2010

pre-algerbra
I have been working on this problem for an hour and a half! I keep getting 1.33 but I know that's not right!! Jim drove the 120 miles to grandmothers house in 3 hours. He increased the speed by 10 miles per hour on the way home. How long did it take him to drive home?
November 4, 2010

o ok thank you jen
November 1, 2010

i think it is que comida es i am not sure????
November 1, 2010

Accounting
Jan. 1 Merchandise inventory \$144,200 Jan. 1–Feb. 7 Purchases (net) 40,000 Jan. 1–Feb. 7 Sales (net) 70,000 Estimated gross profit rate 40% Estimated merchandise inventory destroyed:
October 28, 2010

Pre Cal
What is the inverse of g(x)= 1/2(x-1)^3-4
October 25, 2010

chemistry 101
how much energy is released when 10 g of steam at 100 degrees celsius is condensed and cooled to body temperature?
October 24, 2010

Finance
Find the least amount that could be deposited in a bank account today at 10% compounded quarterly to allow \$650 withdrawals at the end of each quarter for 8 years?
October 20, 2010

Finance
Gretta wants to retire in 13 years. At that time she wants to be able to withdraw \$12,500 at the end of each 6 months for 10 years. Assume that money can be deposited at 12% per year compounded semiannually. What exact amount will Gretta need in 13 years?
October 20, 2010

Finance
A 46-year-old man deposits a total of \$2000 per period in an IRA until age 65. How much money will be in the account if the interest rate is 10% compounded semiannually with payments made at the end of each semiannual period?
October 20, 2010

Chemistry
The Bohr model stops representing correct atomic structure when? Why? What does this mean for remaining atoms? How does Bohr's model relates to the periodic table?
October 19, 2010

Chemistry
A solution is labeled as ~8M NaOH. How many mL of this solution would be needed to prepare 750mL of a ~0.2M NaOH solution?
October 19, 2010

physics
A 120 N child is in a swing that is attached to ropes 2.20 m long. Find the gravitational potential energy of the child-Earth system relative to the child's lowest position at the following times. (a) when the ropes are horizontal (b) when the ropes make a 29.0° angle ...
October 18, 2010

Chemistry
Mercury and bormine react with each other to produce mercury(II)bromide: Hg + Br2 -> HgBr2 a) What mass of HgBr2 can be produced from the reactiion 10g HG and 9g Br2? [the part that really confuses me] What mass of which reagent is left unreacted? b) What is the mass of ...
October 17, 2010

calculus
Regard y as the independent variable and x as the dependent variable and use implicit differentiation to find dx/dy. y sec(x) = 9x tan(y)
October 17, 2010

english
How do the characters, plot, and theme of The Great Gatsby support or refute the statement that "the Jazz-Age society was a bankrupt world, devoid of morality, and plagued by a crisis of character"?
October 17, 2010