# Posts by courtney

Total # Posts: 788

**Calculus**

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

*February 21, 2008*

**Calculus**

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

*February 21, 2008*

**Calculus**

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

*February 21, 2008*

**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....

*February 21, 2008*

**calculus**

thanks

*February 20, 2008*

**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

*February 20, 2008*

**calculus**

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

*February 20, 2008*

**the novel**

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

*February 20, 2008*

**THE call of the wild**

This sentence from a hypothetical novel suggests what kind of narrative voice?

*February 20, 2008*

**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...

*February 13, 2008*

**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?

*February 13, 2008*

**science**

what is (aenosss) unscrambled

*February 12, 2008*

**Calculus**

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

*February 6, 2008*

**Spelling/Analogy**

What is the analogy with brush?

*January 30, 2008*

**Spelling/Analogy**

What is the analogy that goes with brush?

*January 30, 2008*

**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/

*January 22, 2008*

**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 ...

*January 18, 2008*

**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, ...

*January 17, 2008*

**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 ...

*January 17, 2008*

**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 ...

*January 16, 2008*

**physics**

k I'll try it, thanks.

*January 16, 2008*

**physics**

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

*January 16, 2008*

**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 ...

*January 16, 2008*

**PHYSICS**

so you get the distance to equal .84?

*January 15, 2008*

**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 ...

*January 15, 2008*

**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.

*January 13, 2008*

**Chem**

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

*January 6, 2008*

**math**

i need help congruence chapter all about it

*January 3, 2008*

**math b1**

is that a negative 8

*January 3, 2008*

**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

*December 28, 2007*

**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 ...

*December 17, 2007*

**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 ?

*November 29, 2007*

**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?

*November 22, 2007*

**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 ...

*November 20, 2007*

**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?

*November 19, 2007*

**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 ...

*November 18, 2007*

**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 ...

*November 16, 2007*

**College Algebra**

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

*November 15, 2007*

**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.

*November 13, 2007*

**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 ...

*November 10, 2007*

**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 ...

*November 9, 2007*

**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?

*November 7, 2007*

**math**

Darcy must work 35 hours (472.5 divided by 13.5)

*November 7, 2007*

**math**

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

*November 7, 2007*

**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

*October 14, 2007*

**Math**

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

*October 8, 2007*

**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

*October 2, 2007*

**Pre-Calculus**

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

*October 1, 2007*

**College Algebra**

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

*September 18, 2007*

**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 ...

*September 16, 2007*

**Math-Algebra**

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

*September 16, 2007*

**algebra1**

how do you make a histogram

*August 30, 2007*

**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

*August 15, 2007*

**Adv. Alg. w/Trig.**

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 ...

*May 28, 2007*

**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 ...

*May 28, 2007*

**math [radicals]**

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

*May 20, 2007*

**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, ...

*April 9, 2007*

**math**

30.9L = ? kL 45meters= .045km

*March 25, 2007*

**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 :)

*March 1, 2007*

**physics**

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

*March 1, 2007*

**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.

*March 1, 2007*

**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 ...

*March 1, 2007*

**math number story**

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

*February 27, 2007*

**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 ...

*February 21, 2007*

**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 ...

*February 16, 2007*

**Health Project Ideas**

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

*February 6, 2007*

**math**

How to do math?

*January 23, 2007*

**genetics**

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

*January 10, 2007*

**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 ...

*January 4, 2007*

**geography**

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

*January 3, 2007*

**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...

*January 2, 2007*

**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 ...

*January 1, 2007*

**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 ...

*December 10, 2006*

**biology**

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

*November 30, 2006*

**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?

*November 29, 2006*

**math anyone? : ]**

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

*November 20, 2006*

**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

*November 20, 2006*

**math (transition)**

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

*November 20, 2006*

**math (transition)**

i need some help in math here is the problem if anyone can help me please reply When the fuel tanks of an airline are 3/8 full, they contain at least 6300 gallons. How much fuel can the airliner hold when the tanks are full? Since 3/8 equals 6300, you need to see how many ...

*November 20, 2006*

**math (transition)**

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

*November 20, 2006*

**Math (transition)**

i need some help figuring out this question 2 3/5c - 1/2 > 3/10 3/5x2 - 1/2 > 3/10 x=2

*November 20, 2006*

**Math (Transition)**

I need some help in math here is the problem if anyone can help me please reply When the fuel tanks of an airline are 3/8 full, they contain at least 6300 gallons. How much fuel can the airliner hold when the tanks are full? Since 3/8 equals 6300, you need to see how many ...

*November 20, 2006*

**math**

I need help solving these equations -5s+3s-2s=48 6m=5m-2+m 5d=-2d-24 you need help or you want someone to solve them for you? ;) please solve : ) thanks okay well pretty much solve for s in the first question and m for the second question and d in the third and when you think ...

*October 30, 2006*

**Math**

I need help with figuring out the equation 5(2x+3)-8x=7 5(2x+3)-8x=7 10x+15-8x=7 2x+15=7 2x=7-15 2x=-8 /2 /2 x= -4 uh -8/2=-16 yes?

*October 30, 2006*

**personal finance**

i need help with my personal finance home work Post Your Question so someone can answer it. Sue and Tom Wright are assistant professors at the local university. They each take home about $40,000 per year after taxes. Sue is 37 years of age, and Tom is 35. Their two children, ...

*October 8, 2006*

**Physics**

60/61

*September 27, 2006*

**Algerbra 1**

1/3x + 5/6 = 2/9x - 1/3 How do I solve this to get the answer? For basic algebra you need to understand that we can add (or subtract) the same quantity from both sides without affecting the = sign. We can also multiply and divide (except by 0) both sides without affecting the...

*September 14, 2006*

**History**

1d.) Congress requires a 3/4 majority for amending the constitution.

*August 27, 2006*