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December 20, 2014

Posts by katie


Total # Posts: 1,716

geometry
how do I find the measurement of the hypotenuse side of a triangle when the other side measurements are 5 and 12
May 1, 2011

physics
Electrons flow from a ___ potential to a ___ potential.
May 1, 2011

physics
Find the cross-sectional area of copper wire that is 55.4 m long and has a resistance of 0.943 ohms. The resistivity of copper is 1.79 x 10^-8 ohms m.
April 28, 2011

Chemistry
You have a reaction using the following criteria: 1.3456 g of barium chloride solution (0.786M) is mixed with 1.20089 g of sodium sulfate solution (1.3M). The ambient pressure is 754.564 mmHg and the temperature is 56.889 degrees celsius. Determine the volume of the gas produced.
April 26, 2011

Statistics
TRUE OR FALSE: For a set of data with mean 6 and variance 16, approximately 68% of the values will fall between -2 to 14.
April 25, 2011

English
I need help analyzing this poem please Seasonal Anxiety Spring never felt like a beginning— Something, perhaps, to do with school And all the school-year's slow unspinning From wound-up time as from a spool Aimed at Summer's golden rule. Beginnings are for autumn ...
April 24, 2011

PHYSICS
Sally Sue, an enthusiastic physics student enjoyed the opportunity to collect data from standing waves in a spring. She and her partner help the ends of their spring 4.00 meters apart. There are 5 nodes in the standing wave produced. Sally moved her hand from the rest position...
April 19, 2011

Math 9
2 extension ladders are leaning at the same angle against a vertical wall. The 3 meter ladder reaches 2.4 meters up the wall. How much farther up the wall does the 8 meter ladder reach?
April 19, 2011

Prime Minister
nuclear power generation is like the plants in Japan that are causing so much trouble. If it was me, i would suggest to keep the exisiting plants we have now, and upgrade their saftey levels and back up power sources. And, in the future, if we as a country, build more, they ...
April 19, 2011

science
This disease starts in infancy and usually results in death by the age of 4 years.
April 19, 2011

Biology
Try this link and see if it helps you any. the human genome project in google.
April 19, 2011

statistics
Let x be a continuous random variable that is normally distributed with a mean of 24 and a standard deviation of 7. Find the probability that x assumes a value between 27.5 and 59.0. Use Table IV in Appendix C to compute the probabilities. Round your answer to four decimal ...
April 18, 2011

statistics
Let x be a continuous random variable that is normally distributed with a mean of 65 and a standard deviation of 15. Find the probability that x assumes a value less than 45.
April 18, 2011

statistics
Find the area between x = 9.5 and x = 23 under a normal distribution curve with μ = 20 and σ = 4 .
April 18, 2011

statistics
Let x be a continuous random variable that is normally distributed with a mean of 65 and a standard deviation of 15. Find the probability that x assumes a value less than 44.
April 18, 2011

6th grade math
Find the sum of the angle in each regular polygon. (Pentagon)
April 18, 2011

physics
Using fn = (nv)/(2L) and plugging in values as fn = f6 = 557.14 = (6v)/(2*0.7) and solving for v, we get v = 130 m/s.
April 17, 2011

physics
Using fn = (nv)/(2L) and plugging in values as fn = f6 = 557.14 = (6v)/(2*0.7) and solving for v, we get v = 130 m/s.
April 17, 2011

physics
Prolonged exposure to sounds of intensities lower than the threshold of pain can also damage the ear. This is more dangerous since there is no pain to warn the victims about the ear damage and they can end up damaging their ears unknowingly through prolonged exposure to such ...
April 17, 2011

physics
(A) When only one end is open, it is a 'closed' pipe and so we use Where fn = frequency of nth harmonic (Hz) n = harmonic number v = speed of sound inside the pipe (m/s) L = length of pipe closed at one end (m) Plugging in the values and solving, we get f1 = 428.75 Hz ...
April 17, 2011

Spanish-7th please check
Did I answer these correctly? ¿Qué necesitas para jugar al tenis? Necesito una raqueta y una pelota de tenis para jugar al tenis. ¿Cuándo juegas el ajedrez? Yo juego el ajedrez por la noche.
April 13, 2011

physics help
I need help confirming my answers: 1) The work done on an electric charge equals a) IR b)q/t c)Vq d) It I think it's C.(Vq) 2) The direction of an electric field is the direction that a ___ test charge will move when placed in the field. a)negative b) positive c) neutral I...
April 10, 2011

biomechanics
If a soccor ball with a mass of 0.43 kg is kicked while it is in the air, with a force of 15 N oriented 32 degrees above the horizontal, what is the resultant acceleration?
April 8, 2011

physics
I need help confirming my answers: 1) The work done on an electric charge equals a) IR b)q/t c)Vq d) It I think it's C.(Vq) 2) The direction of an electric field is the direction that a ___ test charge will move when placed in the field. a)negative b) positive c) neutral I...
April 7, 2011

Chemistry
All of those are separate reactions that are being reacted with 50 mL of 1.50 M NH3.
April 5, 2011

Chemistry
How do you calculate the volumes of the acid solutions (1.50M HCl, 1.50M HNO3, and 1.50 M H2SO4?
April 5, 2011

Math
A circular garden has an area of 25π m2 If the . radius is increased by two meters, and fencing is sold only in one meter sections, how much fencing is needed to keep out the rabbits
April 4, 2011

Chemistry
Sorry my computer accidentally resent it!
April 3, 2011

Chemistry
Is a calibrated thermometer more precise than one that has not been calibrated? What implications does this have for measuring temperature changes as contrasted with measuring individual temperatures?
April 3, 2011

Chemistry
Is a calibrated thermometer more precise than one that has not been calibrated? What implications does this have for measuring temperature changes as contrasted with measuring individual temperatures?
April 3, 2011

MATH
Method 1 Simply list the multiples of each number (multiply by 2, 3, 4, etc.) then look for the smallest number that appears in each list. Example: Find the least common multiple for 5, 6, and 15. First we list the multiples of each number. Multiples of 5 are 10, 15, 20, 25, ...
March 31, 2011

chemistry
A scientist wants to make a solution of tribasic sodium phosphate, \rm Na_3PO_4, for a laboratory experiment. How many grams of \rm Na_3PO_4 will be needed to produce 250 mL of a solution that has a concentration of \rm Na^+ ions of 0.600 \it M?
March 30, 2011

Chemistry
Would you use q/mass*change in T= c so 1930J/(500g*10degC)=.386J/degC?
March 29, 2011

Chemistry
An unknown material absorbs 1,930 J of heat when it changes from 25 °C to 35°C. The sample weighs 500g. What is the specific heat of this material?
March 29, 2011

Math
After the first 41 games of the baseball season, the Red Sox have a winning percentage of 0.585 and the Yankees have 0.512. How many games behind the Red Sox are the Yankees?
March 29, 2011

math
so there be 25 green, 15 blue, 10 red???
March 29, 2011

math
TODAY
March 26, 2011

chemistry
write an equilibrium constant expression for the reaction of acetylene gas with hydrogen gas to produce methane gas.
March 24, 2011

algebra
A set of 2 similar triangles was drawn in a design. One of the triangles was ½ of the other. If the measures of the smaller triangle were 5, 7, and 12 cm, the measures of the larger triangle = 10,14 and 20 cm. true or false
March 24, 2011

Geometry quick i have test tomorrow
what is the length of any diagonal of a regular pentagon with a side of 20mm
March 23, 2011

geometry
what is the length of any diagonal of a regular pentagon with a side of 20mm ?
March 23, 2011

Chemistry
How do i determine the exact molarity of .2 M of HCL? The molarity of NaOH Used was .2010M used in the titration. And the volume used 10.33 mL used to reach equivalence point. What would be the Molarity of HCL?
March 22, 2011

math
if less then a half of a garden is planted with corn is it a reasonable to estimate that 2-3rds of the garden is planted with corn?
March 21, 2011

chemistry
If 74.5 grams of a hot metal was added to 56.4 grams of water and the temperature of the water rose from 20.4 to 33.4 degrees, how many KJ of energy was lost by the hot metal? i need helping setting up where the numbers go. I'm lost
March 20, 2011

chemistry
i need help setting this problem up. i don't understand which numbers go where
March 19, 2011

chemistry
If 74.5 grams of a hot metal was added to 56.4 grams of water and the temperature of the water rose from 20.4 to 33.4 degrees, how many KJ of energy was lost by the hot metal?
March 19, 2011

Differential equation- Math
Find the general solution of the following system of equation? Please help, i don't know what to do... dx/dt = 3x +2y +2z dy/dt = -5x - 4y - 2z dz/dt = 5x + 5y +3z.
March 17, 2011

amet
substituting t=12s gives a = 2(12) - 10 = 14m/s-2 Using the formula d = Vit +1/2 at^2 d = 15(12) + 0.5 (14)12^2 d = 180 + 1008 d = 1188 meters (distance traveled) add the initial position d = 1188 + 1.8 = 1189.8 (Position of particle) I hope this is correct... :(
March 17, 2011

social studies
it say to briefly describe the events that followed the Confederate defeat at Gettysburg. (civil war). first is followed meaning before or after. and what does it mean by describe the events?
March 16, 2011

science
How do you calculate the atomic mass of magnesium? 79% magnesium-24, 10% magnesium-25, 11% magnesium-26
March 14, 2011

algebra
Tammy bought 16 cookies for a party. She had 6 cookies decorated at an extra cost of 25 cents each. If the total cost of the cookies was $9.50, how much did each plain cookie cost?
March 13, 2011

Science
What is the initial temperature? If it is just for phase change then the formula is Q = m L Q = 0.063 x 32.3
March 12, 2011

Science
Calculate the amount of heat required to completely sublime 63.0 g of solid dry ice CO2 at its sublimation temperature. The heat of sublimation for carbon dioxide is 32.3 C.
March 12, 2011

Science
Calculate the amount of heat required to completely sublime 63.0 g of solid dry ice CO2 at its sublimation temperature. The heat of sublimation for carbon dioxide is 32.3 C.
March 12, 2011

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

5th grade math
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 4th grade
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

NOUNS, PRONOUNS, AND ADJECTIVES
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

8th grade Math
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

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