Sunday
May 1, 2016

# Posts by Kate

Total # Posts: 1,875

calc 1
find the derivative f(x)= (x^4+x^2+1)/(x^2+1)
June 11, 2014

Calc
find the derivative f(x)= e^-3x x sin(4x)
June 11, 2014

history
10 examples of racism/white supremacy.
May 31, 2014

math
what is the even numbers here 13, 12, 10, 19, 16? what is the odd numbers here 17 18 15 16 11?
May 13, 2014

Physics
In the figure, a uniform ladder of weight 200 N and length 10 m leans against a perfectly smooth wall. A firefighter of weight 600 N climbs a distance x up the ladder. The coefficient of static friction between the ladder and the floor is 0.50. What is the maximum value of x ...
May 11, 2014

Phys
Centripetal force: a race car driver wants to stay as straight as possible around the curves in the race. What should happen to his radius, force and velocity?
May 7, 2014

spanish
I haven't had a chance to meet with my Spanish professor about my composition and I need to turn it in soon. It's basically just a short past narration (15 sentences) using only the preterite and imperfect. If someone could read through it and let me know what things I...
May 3, 2014

chemistry
CH(CH3)2-NH-CH2-CH2-CH2-CH3
April 9, 2014

chemistry
I can't seem to figure out the name of this organic molecule. I know it's an amine, but that's it. There are two methyls (CH3) attached to a CH, followed by (in order) NH, CH2, CH2, CH2, and CH3. (ignore the ^^^, I had to use them so the atoms would line up...
April 9, 2014

chemistry
Nevermind! I finally solved it! It was 3,3-diethyl-1-pentyne (I forgot I had to write 3 twice).
April 9, 2014

chemistry
My "picture" of the molecule didn't work. Hopefully, this will work better (~ represents a triple bond and ignore the ```) ````````CH3 ````````CH2 HC ~ C - C - CH2 - CH3 ````````CH2 ````````CH3
April 9, 2014

chemistry
I'm having trouble naming this organic chemistry compound. (I'm not sure how to include a picture in this, so I'll try my best to explain it in words and attempt to type it out) The full formula is C9H16. It's an alkyne and the longest carbon chain is 5 carbons...
April 9, 2014

physics
Earthquakes are essentially sound waves—called seismic waves—traveling through the earth. Because the earth is solid, it can support both longitudinal and transverse seismic waves. The speed of longitudinal waves, called P waves, is 7800m/s . Transverse waves, called...
April 7, 2014

chemistry
"Write equations for the half-reactions that occur at the anode and cathode for the electrolysis of the following aqueous solution: CuBr2(aq)" Possible oxidation reactions: 1. 2Br- -> Br2 + 2e- = -1.09 2. 2H2O -> O2 + 4H+ + 4e- = -1.23 Possible reduction ...
April 2, 2014

math
Mr.Ricci spent 1/3 of his salary on food and 2/5 of the remainder on transport. What fraction of his salary did he have left? If he had \$600 left, find his salary.
March 19, 2014

Math
XY= -25 what is the constant of variation for this relationship? a. 1/4 b. -25 c. -2.5 d. -0.4
March 11, 2014

physics
Find the mass of 0°C ice that 10g of 100 °C steam will completely melt
February 26, 2014

#1 Is C. Industry. #3 It's not D. In the study guide it says to prepare the introduction and overview last. It's not B. I used that in my test and it was wrong. I'm stuck between C and A. I don't know 2 or 4.
February 11, 2014

math
guess my rule with two rules. Having such as hard time understanding this and would like to be able to explain to my 2nd grader! home wor sheet has 2 circles joined togeather, rule A has 2 girls in it with glasses, in the middle there is another girl with glasses, in rule B ...
February 4, 2014

Writing
Hey Sam was the answer right?
February 4, 2014

physics
A 0.20-kg object is attached to the end of an ideal horizontal spring that has a spring constant of 120 N/m. The simple harmonic motion that occurs has a maximum speed of 2.0 m/s. Determine the amplitude A of the motion.
January 25, 2014

A solution is prepared by dissolving 3.44 g of sucrose, C12H22O11, in 118 g of water. a) What is the molality of the resulting solution? b) What is the mole fraction of water in this solution? B) moles of h2o=118g/18(g/mol)=6.548 mol moles of c12h22O11= 3.44g/342.3(g/mol)=0....
January 17, 2014

A solution is prepared by dissolving 3.44 g of sucrose, C12H22O11, in 118 g of water. a) What is the molality of the resulting solution? b) What is the mole fraction of water in this solution? B) moles of h2o=118g/18(g/mol)=6.5556 mol moles of c12h22O11= 3.44g/342.3(g/mol)=0....
January 16, 2014

B) moles of h2o=118g/18(g/mol)=6.5556 mol moles of c12h22O11= 3.44g/342.3(g/mol)=0.10049 mol 6.5556 mol/(6.5556 mol + 0.10049 mol= 0.984902 mol A) M= (0.10049)/(0.00344 kg + 0.118 kg)= 0.82749 m c12h22O11
January 14, 2014

Chemisty
A solution is prepared by dissolving 3.44 g of sucrose, C12H22O11, in 118 g of water. a) What is the molality of the resulting solution? b) What is the mole fraction of water in this solution?
January 14, 2014

Math
Select the x-coordinate of the vertex of the parabola defined by the function f(x) =-5x^2+7x+8
January 11, 2014

Thank you!
January 8, 2014

Write the decimal 0.063 as a percent. Answer choices: 0.63% 6.3% 63% 630% MY ANSWER: 6.3%
January 8, 2014

Thank you so much!
January 8, 2014

Write the fraction 8/9 as a percent. Round to the nearest hundredth of a percent where necessary. My answer: 88.9%
January 8, 2014

MATH
It would take you a long time to measure the length across town with feet. C. length of your room, would be a more logical answer.
January 7, 2014

math
There were 10 more boys than girls at an outing. Each boy was given 3 sweets and each girl was given 4 sweets. A total of 156 sweets were given to the children. How many girls were there at the outing?
January 1, 2014

ELA
Oh okay thanks I'll just ask my teacher for help. Thanks anyways
December 17, 2013

ELA
Give an example of an simile using only the words butterfly and meadows.
December 17, 2013

math
If you were moving at a speed of 0.00025 kilometers per hour, what is your speed in meters per minute?
December 4, 2013

pre-calc help
Thank you so much!!!
November 27, 2013

pre-calc help
Convert the rectangular coordinates to polar coordinates with r > 0 and 0 ≤ θ < 2π. (9, −9) (r, θ) = ?
November 27, 2013

pre-calc help
Thank you so much!
November 27, 2013

pre-calc help
Solve the given equation. (Enter your answers as a comma-separated list. Let k be any integer. Round terms to three decimal places where appropriate. If there is no solution, enter NO SOLUTION.) 5 sin^2(x)- 21 sin(x)+ 4 =0
November 27, 2013

South America
What is the longitude and latitude of every piece of south America?
November 20, 2013

Pre-Calc (Prove the identity)
Prove the identity. (show your work please) tan(x − π/4)= (tan x − 1)/(tan x + 1) Thank you!
November 19, 2013

algebra
4(5n-7)=10n+2
November 6, 2013

math
What's the opposite reciprocal of 1?
November 6, 2013

Calculus
Nevermind, got it.
October 30, 2013

Calculus
A spotlight on the ground is shining on a wall 12m away. If a woman 2m tall walks from the spotlight toward the building at a speed of 0.6m/s, how fast is the length of her shadow on the building decreasing when she is 2m from the building?
October 30, 2013

Physics
If the mass of a planet is 0.571 times that of the Earth and its radius is 0.787 times that of the Earth, estimate the gravitational field g at the surface of the planet. The gravitational acceleration on Earth is 9.8 m/s2. Answer in units of m/s2
October 29, 2013

Physics
In the Bohr model of the hydrogen atom, the speed of the electron is approximately 2.1 × 106 m/s. Find the central force acting on the electron as it revolves in a circular orbit of radius 4.51 × 10−11 m. Answer in units of N
October 29, 2013

STAT
a. 2.28
October 29, 2013

Math
Make up a data set of at least 12 numbers that have the following landmarks Maximum 18 Mode 7 Range 13 Median 12 Make a bar graph of the data
October 10, 2013

Chemistry
The bottle was previously opeedn, thus altering the water content. This is because hydrates do not keep their stoichiometric ratio of cations and anions to water molecules. Hope this helps.
October 8, 2013

Math
Combine like terms and solve 6a + 5a = -11 6a+5a = 11a 1) 11a = -11 /11 /11 2) a = -1
September 25, 2013

math
Just break it down 4 (10's)= 10+10+10+10 = 4*10 = 40 5 (10's)= 10+10+10+10+10 = 5*10 = 50 9 (1's)= 1+1+1+1+1+1+1+1+1= 9*1 = 9 You can also rewrite the problem this way 40 < x < 50 This means the number has to be between 40 and 50, but it must also have 9 ones...
September 25, 2013

algebra
A statue is 8 feet tall. The display case for a model of the statue is 18 inches tall. Which scale allows the tallest model of the statue that will fit in the display case. A 1 inch : 2 inches B 1 inch : 7 inches C 1 inch : 5 inches D 1 inch : 10 inches
September 16, 2013

English
What is the tone of at the lunch counter?
September 16, 2013

In triangle ABC, angle B is four times as large as angle A. The measure of angle C is 12∘ more than that of angle A. Find the measures of the angles.
September 7, 2013

Physics
two objects move toward each other collide and separate. there was no net external force acting on the objects but some kinetic energy was lost. is momentum conserved ? what is the explanation ?
August 16, 2013

math
= 27600 X 100/115 = 24000
August 16, 2013

Physics
An object with mass 20 kg is moving horizontally. if the velocity of the object is doubled, does the momentum increased or decreased ? what is the explanation ?
August 16, 2013

math
4/57(x+8)=1/3
August 16, 2013

Chemistry
3.00 g of Zn is allow to react with 1.75 g CuSO4 . calculate how many grams of Zn will remain after the reaction is complete ?
August 11, 2013

Chemistry
suppose 8.00 g of CH is allowed to burn in the presence of 9.00 g of oxygen. how much (in gram) CH4 , O2 and H2O remain after the reaction is complete ?
August 11, 2013

Chemistry
0.300 moles of bromine gas (Br2) and 0.500 moles of chlorine gas (Cl2) react to for tribromochlorine (Br3Cl). how many moles of this product will form ?
August 11, 2013

biology
Why all enzyme work well in their own optimum temperature and optimum pH ? i need more explanation about why different enzyme have different optimum temperature and different optimum pH to react. i hope to get a long explanation for my essay that contain 5 marks.
July 31, 2013

Harvard Justice
According to the Professor Sandel, if judgments about the good are unavoidable in debates about justice and rights, is it possible to reason about the good (these judgments about the good)? a) If reasoning about the good means that you must have a single principle or rule or ...
July 31, 2013

biology
Do all enzymes function within the different temperature range, like they do with pH?
July 29, 2013

physics
as i have known that centripetal force is directly proportional to the angular speed square. so, what is the relationship between angular speed and centripetal force ? when centripetal force increase, does angular speed increase too? i need more explanation.
July 29, 2013

math
solve my system of equation with full steps 3x+4y=29 2x–5y=-19
July 24, 2013

english
use athlete in the sentence an ____ training requires long hours of exercises.
July 23, 2013

physics
what is the source of error occur in experiment Standing Waves (tuning fork)?
July 16, 2013

Physics Experiment
sorry, wrong typo... the answer is when the water level is lower, the air in the glass tube. the changing of the L is to match the natural frequency of the air column inside the glass tube with the tuning fork that vibrate at fixed frequency. when the matching is achieve, the ...
July 11, 2013

physics
what is the source of error occur in experiment Standing Waves (tuning fork)?
July 11, 2013

Chemistry
Henry's Law says: Pressure(gas)=(Henry's Law Constant)(Molarity of the gas)… we are looking for Molarity so we can rewrite the above equation as… Molarity of the gas=Pressure(gas)/(Henry's Law Constant) so… M=1.95 bar/29.4 barM-1 the bar units cancel...
July 5, 2013

phy
An engine absorbs 2000j of heat from a hot reservoir and expels 750j to a cold reservoir during each poerating cycle, (i)what is the efficiency of the engine (ii)How much work is done during the cycle? (iii)What is the power output of the engine if each cycle last for 0.5 ...
July 4, 2013

phy
(Q1)A gas occupies a certain volume at 27c.If it is heated at constant pressure, its volume is exactly doubled at a temperature of. (a)54c(b)219c(c)327c(d)600c (Q2)If the specific heat capacity of water initially is4.2000/kg/k and the difference in temperature of water between...
July 3, 2013

phy
(Q1)the temperature at which the tungsten filament of a 12v and 36w lamp operates is 1730c.If the temperature coefficient of resistance of tungsten is 0.006/k, find the resistance of the lamp at room temperature of 20c (a)10.00(b)0.45ohms(c)0.39ohms(d)4.00ohms (Q2)At what ...
July 3, 2013

phy
(Q1)A wire of cross- sectional area of 0.00006m2 and length 50cm stretches by 0.2mm under a load of 3000n.Calculate the Young's modulus for the wire (a)80000000000Nm-2(b)125000000000Nm-2(c)25000000000Nm-2(d)5000000000Nm-2 (Q2)a square plate of side 10cm is made of a metal ...
July 3, 2013

phy
(Q1)calculate the electric power which must be supplied to the filament of a light bulb operating at 3000k. the total surface area of the filament is 0.000008m2 and iits emissivity is 0.92.(a)20.3w (b)33.8w(c)46.4w(d)56.7w (Q2) calculate the change in internal energy of 2kg of...
July 3, 2013

phy
an ungraduated mercury thermometer attached to a millimeter scale reads 22.8mm in ice and 242mm in steam at standard pressure. What will the millimeter read when the temperature is 20
July 2, 2013

Chemistry
How do I calculate this? How many grams of CaCl2 is in 500 mL 0.1 M solution of CaCl2
June 25, 2013

physics
A 2.0-m-tall, 30-cm-diameter concrete column supports a 3.0×105kg load. By how much is the column compressed (in mm) ?
June 22, 2013

Math
7/3a + 2/5= ?
June 9, 2013

paychecks each week will be as follows : \$325 x 40 = \$13,000 (gross earnings /week) \$13,000 x 0.062 = \$806 (total combined social security) \$13,000 x 0.0145 = \$188.50 (total medicare taxes) social security : 806 medicare: 188.50
June 8, 2013

physics
A box is placed 50 cm away from a double convex lens. The image is on the opposite side of the lens, is inverted and 50 cm away from the lens. find: a)the focal length of the lens. b)the height of the image. c) using the focal length that you found, how far from the lens would...
May 30, 2013

MATH
1- increase 1000 dollars by 10% then decrrese ur answer by 10% wat do u notice? 2- my parents increased my pocket money by 10% then 3 months later increased it by further. 10%'. My father said there was an increase of 21% , can u explain this?
May 25, 2013

Algebra
Thank you
May 22, 2013

Algebra
You are building a rectangular deck. The area of the deck should be 250 ft squared. You want the length of the deck to be 5 ft longer than twice its width. What should the dimensions of the deck be? My work: 250=2x(x+5) Is this correct so far?
May 22, 2013

Frenchhhhhhhhhh
Thanj u all
May 22, 2013

Frenchhhhhhhhhh
1- avez vous des eu 2- tu en as / des as? 3- elles des ont?
May 22, 2013

Frenchhhhhhhhhh
Replace the capitalized words with either, le,la,en,des..
May 22, 2013

Frenchhhhhhhhhh
Please help! I have to replace 1- avez-vous eu DES CADEAUX pour votre anniversaire? 2- tu as des COURS DE FRANÇAIS tous les jours? 3-elles ont beaucoup D'AMIS au collége??
May 22, 2013

Algebra
Use the zero product property to solve the equation: -3n(2n-5)=0
May 21, 2013

AP English Lit
Thank you so much! I appreciate it. :)Kate
May 21, 2013

AP English Lit
I think your right but I've no idea what else it could be. I don't know what to do. :( Kate
May 21, 2013

AP English Lit
Hi, I was wondering what kind of poem "Dream Variations" by Langston Hughes is? I've narrowed it down to blank verse or free verse but I'm not sure. Please help. Here is the poem: Dream Variations To fling my arms wide In some place of the sun, To whirl and ...
May 21, 2013

AP English Lit
Well, it's not a sonnet because it has 12 lines. So, I'm not sure but I think it's blank verse? Maybe. But, it might also be couplets. By the way, thanks for getting back to me. Kate
May 20, 2013

AP English Lit
Hi, I have a question that I'm stuck on. Do you know what kind of poem William Butler Yeats's poem "When You Are Old" is? That is, is it a sonnet or an epic or something else altogether? Please help! Here is the poem: <strong>When You Are Old</strong...
May 20, 2013

TRIGONOMETRY
Can someone please show me step by step solutions? I'd appreciate if you did so I know how you get the answer. Thank you so much! Solve each equation, giving a general formula for all of the solutions: a)2sin^2 x-5sinx-3=0 b)(cosx-(sqrt2/2))(secx-1)=0 Would the general ...
May 18, 2013

TRIGONOMETRY
Aah, okay! That's easy enough! That makes total sense. Thanks!
May 18, 2013