# Posts by courtney

Total # Posts: 810

Alegebra 2
Factor x^3+2x^2-36x-72

government
Why did the South choose to return to a Confederacy despite the failures of this governmental form in the late 18th Century?

Physics
170 students in a lecture hall can scream at 115 dB. Thus, we should expect that: A. an average student can do 0.68 dB by him or herself. B.340 average students can do 125 dB. C.340 average students can do 230 dB. D.1700 average students can do 125 dB. E.85 average students ...

English
1. C Correct 2. B Correct 3. D C STUDY GUID 98-100 4. A Correct 5. C Correct 6. C Correct 7. D Correct 8. C Correct 9. C Correct 10. D Correct 11. A Correct 12. C B STUDY GUID 94-96 13. D Correct 14. D Correct 15. B Correct 16. A Correct 17. B Correct 18. A Correct 19. C B ...

Science
What first appeared in the Carboniferous Period i cant find it anywhere

Trig
Simplify: csc A - sin A - Cot A Cot A Csc A 1/sin - sin A - 1/tan 1/tan 1/sin -sinA?

Physics
A skier starts at rest on the top of Mt Circular, a strange, smooth, icy hill shaped like a hemisphere. The hill has a constant radius of R. Neglecting friction (it is icy!), show that the skier will leave the surface of the hill and become air-borne at a vertical distance of ...

math
what is 30000+6004=

Physics
A small electric immersion heater is used to boil 191.0 g of water for a cup of instant coffee. The heater is labeled 355.0 W, which means that it converts electrical energy to heat at this rate. Calculate the time required to bring this water from 12.0°C to the boiling ...

Physics
Nevermind I got it =]

Physics
Which of the following is an example of something not allowed by the second law of thermodynamics? Indicate true or false. 1.All refrigerators can be made perfect 2.A spoon in a hot drink spontaneously stirring the drink 3.All the molecules suddenly moving to one place in a ...

Interpersonal Communication in Criminal Justice
just to let you know the escobedo v. illinios case "The Supreme Court overturned Escobedo's conviction and recognized a suspect's right to an attorney during police interrogation." and it wasn't so much about the marianda rights it was more about the due ...

Physical Science
The nucleus of an atom contains six neutrons and esix protons. The nucleus of a second atom contains six neutrons and five protons. Are they atoms of different elements or isotopes of the same element?

physics
A cart of mass M1 = 4.00 kg and initial speed = 4.00 m/s collides head on with a second cart of mass M2 = 2.00 kg at rest. Assuming that the collision is elastic, find the speed of M2 after the collision. i keep getting 2.3 m/s what am i doing wrong?

pre-calculus
find the cube roots of -216 answer in polar form and complex

Physics
A moving 4.80 kg block collides with a horizontal spring whose spring constant is 243 N/m. The block compresses the spring a maximum distance of 5.50 cm from its rest position. The coefficient of kinetic friction between the block and the horizontal surface is 0.390. What is ...

physics
oh sorry its If the crate starts from rest, how fast will it be moving after the man has pulled it a distance of 2.70 m?

physics
A man pulls a crate of mass 53.0 kg across a level floor. He pulls with a force of 180.0 N at an angle of 28.0° above the horizontal. When the crate is moving, the frictional force between the floor and the crate has a magnitude of 124.0 N. If the crate starts from rest, ...

Physics
actually it's 1 false 2 true 3 false 4 false 5 true 6 true

Physics
there's three parts, i keep getting these wrong please help. A set of crash tests consists of running a test car moving at a speed of 11.8 m/s (26.4 mi/hr) into a solid wall. Strapped securely in an advanced seat belt system, a 59.0 kg (130 lbs) dummy is found to move a ...

Acids and alkalis

Calculus
is that how you prove it?

Calculus
prove: if z is a complex number and 1/z=the conjugate of z over the absolute value of z squared.

Calculus
prove: if z is a complex number and 1/z=the conjugate of z over the absolute value of z squared.

Calculus
prove: if z is a complex number 1/2= the conjugate of z of the absolute value of z squared.

physics
A bullet (m = 0.0250 kg) is fired with a speed of 91.00 m/s and hits a block (M = 2.30 kg) supported by two light strings as shown, stopping quickly. Find the height to which the block rises. and Find the angle (in degrees) through which the block rises, if the strings are 0....

calculus
thanks

calculus
im sorry they were two different questions you have to find the modulus and the argument ex.15-4i modulus-4 but i don't know what the argument is

calculus
find the modulus and the argument of the following complex numbers: 15-4i and a-ai where a is greater than 0

the novel
What does the word mimetic tell us about the difference between novels and most of the literature of the 1800s?

THE call of the wild
This sentence from a hypothetical novel suggests what kind of narrative voice?

Physical Science
I asked a question earlier about a thermometer in a can containing a substance that is being heated.Temperature remains the same for minutes, then start to rise. Without looking in the can, how does student know whats occurring in the can?I was told a phase change what kind of...

Physical Science
Inferring:A student examines a thermometer placed in a can containing a substance that is being heated. The temperature remains the same for several minutes, then it starts to rise.Without looking in the can, how does the student know what is occurring in the car?

science
what is (aenosss) unscrambled

Calculus
Prove the identity and give its domain. 4sinxcosx+sin4x=8sinxcos^3x

Spelling/Analogy
What is the analogy with brush?

Spelling/Analogy
What is the analogy that goes with brush?

Statistics
Suppose the correlation between SAT Verbal scores and Math scores is 0.57 and that these scores are normally distributed. If a student's Verbals core places her at the 90th percentile, at what percentile would you predict her Math score to be/

Pre-Calculus
A rectangular garden with an area of 250 square meters is to be located next to a building and fenced on three sides, with the building acting as a fence on the fourth side. Let x be the length of the side parallel to the building. 1. Find T(x), the total amount of the fence ...

Physics
A 13 kg bucket of water is attached toa rope that is wound around a cylinder whose radius is 10.3 cm. A crank with a turning radius of 44.6 cm is attached to the cylinder. If the bucket accelerates upwards at a rate of 1.21 m/s^2, then how much tension is on the rope? Again, ...

Physics
A hitter hits a baseball into the air. The shortstop, who was initially 33.5 meters away, begins running directly away from home plate at 7 m/s at the moment that the ball was hit and catches the ball, while still running, at the same height from which it was hit, 3.2 seconds ...

physics
A ball is thrown vertically upwards with an initial velocity of 20.96 m/s. Neglecting air resistance, how long is the ball in the air? What is the greatest height reached by the ball? this problem seems easy enough but I can't seem to get the answer. How can I get time ...

physics
k I'll try it, thanks.

physics
I don't have a polar graph, never even heard of it. Is there any way to do this with equations?

physics
A 14.5 kg ring has 3 ropes attached to it. One rope is being pulled due North with a force of 340 N. Another rope is being pulled 68 degrees South of West with a force of 450 N. How hard and in what direction must the third rope be pulled in order to cause the ring to move 15 ...

PHYSICS
so you get the distance to equal .84?

PHYSICS
a child is pulled on a sled across a snow-covered yard. the combined mass of the child and the sled is 35 kg. the angle that the rope pulling the sled makes with the horizontal is 34 degrees. the person pulling on the rope applies a force of 182 N. given that the coefficient ...

physics
An astronaut weighs 696 N on the Earth. What is her weight on planet X, which has a radius Rx = Rearth 1.60 and a mass Mx = Mearth 8.60? -the only equation I know for weight is "w = m x g"...I don't know how to solve for w using force.

Chem
H2SO4+B(OH)3=B2(SO4)3+H2O

math
i need help congruence chapter all about it

math b1
is that a negative 8

Science
What do I put in my data table for a salt crystal experiment. One grown in bowl on kitchen counter and one in the refrigerator

Physics
A child sits on one side of a teeter totter of length 7.60 m, a distance of 49.7 cm away from the end of the beam. The child has a mass of 21.6 kg. Her mother has a mass of 43.6 kg. How far away from her end does she have to sit in order for the teeter tooter to be exactly ...

physics
Take the density of the crown to be . What is the ratio of the crown's apparent weight (in water) to its actual weight ?

AP Biology
When predicting the change of cellular respiration in an ectotherm, such as a snake,when subjected to a temperature of 5 C, would I be correct in saying that the rate of cellular respiration would increase?

College Algebra
An executive flew in the corporate jet to a meeting in a city 1500 kilometers away. After traveling the same amount of time on the return flight, the pilot mentioned that they still had 300 kilometers to go. The air speed of the plane was 600 kilometers per hour. How fast was ...

College Algebra
A truck driver traveled at an average speed of 55 miles per hour on a 200 mile trip to pick up a load of freight. On the return trip(with the truck fully loaded), the average speed was 40miles per hour. What was the average speed for the round trip?

Precalculus
I'm working on a project and I need some help with figuring out the equations to write. Here is all the information about the project: You and your friends decide to produce your own CD. After searching on the Internet, you find a low-cost CD duplication outfit that will ...

AP Statistics
How would I go about solving these problems? In Exercise 9 we suggested the model N(1152,84) for weights in pounds of yearling Angus steers. What weight would you consider to be unusually low for such an animal? Explain. If you are given the model N(1152,84),what are the ...

College Algebra
Find two consecutive numbers such that the difference of their reciprocals is 1/4 the reciprocal of the small number.

Physics
You place a box weighing 223:2 N on an in- clined plane that makes a 38:4± angle with the horizontal. Compute the component of the gravita- tional force acting down the inclined plane. Answer in units of N.

Statistics
I need help figuring out these two problems. I think I have the right idea about solving them but I'm not exactly sure. 8. Two companies market new batteries targeted at owners of personal music players. DuraTunes claimes a mean battery life of 11 hours, while RockReady ...

AP Statistics
Suppose a Normal model describes the fuel efficiency of cars currently registered on your state. The mean is 24 mpg, with a standard deviation of 6 mpg. -Describe the fuel efficiency of the worst 20% of all cars. I know that you convert 20% into decimal form to get .2 and put ...

history
How does the nationalism that developed over the Berlin Wall in Germany differ from the situation in Northern Ireland with the Catholics and Protestants?

math
Darcy must work 35 hours (472.5 divided by 13.5)

math
how many hours must darcey work at \$13.50per hour to earn \$472.50=

math
neither the answer is -0.5 because -3x means -3 times x/ -3 times -0.5 equals 1.5 which is 3/2 as a fraction

Math
How are 2 hours and the distance traveled in 2 hours represented on the table? On the graph?

College Algebra
What is the leading coefficient and degree in these two problems? 1). 4x^3y - 3xy^2 + x^2y^3 2). -x^5y + 2x^2y^2 + xy^4

Pre-Calculus
How do I find f(g(x)) when there is a radical?

College Algebra
Simplify 5^(-1/2) * 5x^(5/2) / (5x)^(3/2)

Statistics
I need help getting started on this question: Is our system of justice colorblind in the administration of the death penalty? Here is the data given to us (Numbers like 422, 99, etc. represent the number of cases): DEATH Black White SENTENCES Victim Victim Total Black ...

Math-Algebra
I need help factoring these two problems: 1. 8j^3k - 4jk^3 - 7 2. 2ak - 6a + k - 3

algebra1
how do you make a histogram

english
write each pronoun and identify its antecedent if it has one. what is the best way to get good seats for a concert? Check this dictionary definition to find the pronoun. http://dictionary.reference.com/browse/what

I need help writing equations for these two word problems: 1. On June 30th, Mr. Hester will be given \$1,000,000 and in July, Mr. hester will be paid \$100,000 per day. 2. On June 30th, we will set up an account for Mr. Hester starting with \$0.05. Every day in July, the ...

Physics
I have two questions: How many hours of light and darkness are there in June at regions south of the Antartic Circle (dotted line in Southern Hemisphere)? Six months later, when the earth is at the December position, is the situation in the Antartic the same or is it the ...

how do you multiply a radical with a regular number ? for example: 4radical2 ( 2+ 2radical3) first term: 4sqrt2 * 2= 8sqrt2 second term 2sqrt2 * 2 sqrt3= 2*2 * sqrt (2*3) = 4 sqrt6 first term: 4sqrt2 * 2= 8sqrt2 second term 2sqrt2 * 2 sqrt3= 2*2 * sqrt (2*3) = 4 sqrt6

science
if a egyptian mummy has 61% carbon-14 how long ago was it buried? Take a 100 g initial sample. Now there are 61 g C-14. Use ln(No/N) = kt where No = 100 N = 61 You will need k and you may obtain that from k = 0.693/t1/2. Look up t1/2 and substitute in that equation to find k, ...

math
30.9L = ? kL 45meters= .045km

Physics
A bat flying in a cave emits a sound and receives its echo 1 s later. How far away is the cave wall? is it 340.29 m? the speed of sound is 340.29 m/s i believe v = d/t d = (t)(v) d = (340.29)(1) Nope but thanks for trying :)

physics
(a) What is the wavelength of a 450 Hz tone in air?

Physics
The wavelength in air of a sound is 5 m. (a) What is the frequency of the sound? Sound can have any frequency. It is the SPEED of sound that remains constant, independent of frequency, at a given temperature.

Science (physics)
You watch a distant woman driving nails into her front porch at a regular rate of 1 stroke per second. You hear the sound of the blows exactly synchronized with the blows you see. And then you hear two more blows after you see her stop hammering. How far away is she? It takes ...

math number story
Please tell me what a number story is for the number sentence below. 4*8=32

Transition Math
Can you help discribe how to do this or what it will look like? If 25 boys at Central Middle School play basketball and 20 play both soccer and basketball, draw a Venn diagram to represent the soccor and basketball players first of all, you would draw a venn diagram, which ...

Project Management
Offices: Boston, Chicago, Memphis, Charlotte, Atlanta, and Orlando Location of Event: Miami Travel Days: To Miami on Sunday, Returning from Miami on Saturday. Travel Means: Air or Private Auto, whichever is convenient and reasonable. Autos must be shared. Lodging: All ...

Health Project Ideas
How about doing it on sunblock or oats and grains. lol. good luck.

math
How to do math?

genetics
How do you determine genotypes? The only way to determine genotypes is to know the parentage.

Science
Can you please help me solve this lab: Design an item no bigger than a 35 mm film conatiner that will float at the 400 ml mark in a 1000 mL graduated cyllinder with 800 mL of water in it. The item can only be made from "trash", recycled items and common household ...

geography
what volcano dominates the sothern portion of the island of Hawaii? Mauna Loa is probably the volcano you mean.

social studies
Name the 5 regions that the U.S. is divided into. There are many ways to do this dividing. One would be: far west (including rocky mt. states) midwest (including Texas) south midatlantic New England Another, more based upon topography, would be: Pacific coastal region Atlantic...

Science
Can you please help me solve this lab: Design an item no bigger than a 35 mm film conatiner that will float at the 400 ml mark in a 1000 mL graduated cyllinder with 800 mL of water in it. The item can only be made from "trash", recycled items and common household ...

spanish
what does mas adelante mean in english? from now on, forward. thanks Thank you for using the Jiskha Homework Help Forum. When you ask for a translation, you should always give the CONTEXT or exactly how it is used. Here are the possibilities: farther on; later (adverb) go ...

biology
How are complex carbs broken apart? Hint: Look up the words "hydrolysis" and "glycosidic linkage."

Math
How do you convert fractions to a percentage? give me an example and ill explain what is the percentage for 7/4? divide 7 by 4. 1.75 multiply by 100 175 7 is 175 percent of 4. so, 175% = 7/4?

math anyone? : ]
i need some help figuring out this question 2 3/5c - 1/2 > 3/10 combine like terms and divide by 2

Math #2
On average, 1 out of 15 people who visit Margo’s florist shop place an order for roses. Last year, there were no more than 200 orders for roses. How many people visited Margo’s Florist shop last year? 163 visted the shop

math (transition)
i need some help figuring out this question 2 3/5c - 1/2 > 3/10

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