Saturday
April 19, 2014

Posts by abc


Total # Posts: 81

Math
When fX(x) = {2e−2x,if x>0, 0, otherwise, we have fY(y) = {g(y),if a<y, 0, otherwise. Give a formula for g(y) and the value of a using the standard notation. g(y)= a=

Math
When fX(x) = {1/3, if −2<x≤1, 0, otherwise, we have fY(y) = {g(y),if a<y≤b, 0,otherwise. Give a formula for g(y) and the values of a and b using standard notation. (In your answers, you may use the symbol 'e' to denote the base of the natural lo...

Math
P(X>0.75)= 0.2266 P(X≤−1.25)= 0.1056 Can't figure out these: E[Z]= var(Z)= P(−1≤Y≤2)= anyone?

Math
Let X and Y be normal random variables with means 0 and 2, respectively, and variances 1 and 9, respectively. Find the following, using the standard normal table. Express your answers to an accuracy of 4 decimal places. P(X>0.75)= P(X≤−1.25)= Let Z=(Y−3)/4...

Probability
Let X and Y be normal random variables with means 0 and 2, respectively, and variances 1 and 9, respectively. Find the following, using the standard normal table. Express your answers to an accuracy of 4 decimal places. P(X>0.75)= P(X≤−1.25)= Let Z=(Y−3)/4...

probability
anyone know the answers to this?

Probability
has anyone figured out the answer for (c)??

chemistry
use the Henderson-Hasselbalch equation to calculate the pH of a buffer solution prepared by mixing equal volumes of 0.20 M NaHCO3 and 0.10M Na2CO3.(Ka=5.6x10^-11). how would you prepare NaHCO3-Na2CO3 buffer solution that has the pH of 10.40.

Calculus
¡ìdx/(x^2-1)^2

Calculus
¡ì(up:1 down:0) (x^3 dx)/(x^2+2x+1)

Calculus
y"-y'=sin x solve in undetermined coefficients

probability
Before leaving for work, Victor checks the weather report in order to decide whether to carry an umbrella. The forecast is “rain" with probability 20% and “no rain" with probability 80%. If the forecast is “rain", the probability of actually havin...

probability
P(A) = 4/9 P(C) = 0 P(D) = 3/4 Anyone know the solution for the below?: P(B) P(A∩B) P(A∩D)

probability
P(D) = 0.75

Physics Classical Mechanics Help ASAP
fred for temp of 5 degrees celsius b) 55465.76 c) 24 percent

Physics Classical Mechanics Help ASAP
c) 24 percent

chemistry
Knowing that the energy associated with the formation of 1 mole of vacancies in copper (Cu) is 104 kJ, determine the vacancy density (nv/cm3) in Cu at 1085 K. Assume the pre-exponential factor is one. unanswered

chemistry
A p-n junction is obtained at a depth of 3 x 10-3 cm below the surface by diffusion of antimony (Sb) into p-type germanium. What is the donor concentration in the bulk germanium if the diffusion is carried out for three hours at 790 C? Express your answer in number of donor at...

chemistry
The Young's modulus for a material is 15.0 x 10^10 N/m2. The material is stretched to a strain of 6.0 x 10^-3. How much elastic energy will be expended? (Express your answer in J/m3)

chemistry
The Young's modulus for a material is 15.0 x 1010 N/m2. The material is stretched to a strain of 6.0 x 10-3. How much elastic energy will be expended? (Express your answer in J/m3)

chemistry
Knowing that the energy associated with the formation of 1 mole of vacancies in copper (Cu) is 104 kJ, determine the vacancy density (nv/cm3) in Cu at 1284 K. Assume the pre-exponential factor is one. unanswered

Physics Classical Mechanics
have you got answer of any one of your questions????? :p

Quantum Physics
what about others, please help rs and others..........

Quantum Physics
Q7 and 8 please

Math
Five weeks is how many seventy-thirds of a year

math calculus (please help me)
The marginal cost of a product is modeled by dC/dx= 16/cube root 16x + 3 where x is the number of units. When x = 17, C = 120. (a) Find the cost function. (Round your constant term to two decimal places.) c= (b) Find the cost of producing 90 units. (Round your answer to two de...

math 160(buss calculus)
The demand function for a product is given by p = 10,000 [1 − (5/5 + e^−0.001x)] where p is the price per unit (in dollars) and x is the number of units sold. Find the numbers of units sold for prices of p = $1000 and p = $1500. (Round your answers to the nearest i...

physics
its wrong!!!! tell the correct answer

physics
you son of bitc h go in your mother`s slit!!!!!11

physics
its wrong,,,,,,, tell the correct answer

Maths
thanxxxx

Quantum Physics
@abc did you got question 8D?

Quantum Physics
Anonymous, did you get all solutions for Q 7 and 8 except 8(D). If yes then please share......

physical
An electric field with a magnitude of 3.50 kN/C is applied along the x axis. Calculate the electric flux through a rectangular plane 0.350 m wide and 0.7 m long assuming that (a) the plane is parallel to the yz plane; (b) the plane is parallel to the xy plane; (c) the plane co...

physics
A particle starts moving with acceleration 2 m/s2. distance travelled by it in 5th half second is..??

lab
How much 38%Hcl will be used to prepare N/3.05 solution in 2litre water.

Biology
bacteria

Algebra- Check Please
that isn't the answer, use substitution replacing y to the left of the equation 9/7x=-3x+12 solve this for x. then multiply the x you find by 9/7 to get the y

Math
x=green marbles y=blue marbles x+y=57 x+13=y b/c there are 13 more blue marbles substitute in to other equation x+(x+13)=57 then solve for x, then for y add 13 to x

math
you take the prize of the bag and divide that by the number of ounces, the lower of the outcomes gives you your answer

math
to AVG at least a 60 his total test scores must add up to 420 b/c 420/7=60. therefore you can add his current test scores and then subtract that number from 420 to find the minimum he can receive on the 7th test

Physics
On a frictionless table, a 3kg block moving 4m/s to the right collides with an 8kg block moving 1.5m/s to the left. If the blocks stick together, what is the final velocity? How much mechanical energy is dissipate in the collision?

discrete structure
Assume that Adam has 4 books to be bought. For each book, Adam can buy it from 3 different shops. Further assume each shop is unique. Using graph/tree graph,show the possible ways to buy all books starting from book 1 to book 4 in sequence.

linear programming math
A man owns two building supply stores, one on the east side and one on the west side of the city. Two customers order some 1/2 inch plywood. Customer A needs 50 sheets and customer B needs 70 sheets. The east side store has 80 sheets and the west side store has 45 sheets of th...

AP WORLD HISTORY
Increased the use of slavery: using it as a payment for slaves. Violence: people got drunk and violent

PHY
Eris, the largest dwarf planet known in the Solar System, has a radius R = 1200 km and an acceleration due to gravity on its surface of magnitude g = 0.77 m/s2. (a) Use these numbers to calculate the escape speed from the surface of Eris. 1360 m/s correct answer. (b) If an obj...

Science
1. b 2. a 3. d 4. d

statistics
in 1000 tosses of a coin, 560 heads & 440 tails appear. is it reasonable to assume that coin is fair.

PHYSICS
A 30.0 KG LOAD IS BEING RAISED BY A FORCE OF 180N USING THE IDEAL PULLEY ARRANGEMENT SHOWN IN FIG, WHAT IS THE ACCELERATION OF THE LOAD? PLEASE HELP

PHYSICS
A 30.0 KG LOAD IS BEING RAISED BY A FORCE OF 180N USING THE IDEAL PULLEY ARRANGEMENT SHOWN IN FIG, WHAT IS THE ACCELERATION OF THE LOAD? PLEASE HELP

Finance
help the marketing manager decide which product promotion to implement

Finance
help the marketing manager decide which product promotion to implement

Corporate Finance
) A typical use of managerial accounting is to: help the marketing manager decide which product promotion to implement

spanish
please unscramble this spanish word: REGTARLNIA

chemistry
d = m/v = 16.3/85.2 = 0.191

math
If 2^x=3^y=12^z then show that 1/z = 1/y + 2/x

geometry
In the figure shown, NK and ML are parallel, JN=10 feet, NK=14 feet, JL=22 feet, and ML=24. Find KL.

algerba..plz help
A 400 g solution is 25% salt. How much salt must be added to produce a solution that is 40% salt?

math
Yup!

math
You just do 1/8 to find the percentage.

Grammar
Do your parents come from El Salvador?

geometry
a=46c

cpu
lim x infnitive (4x-1/2x+9)

math
lim x infinitive (4x-1/2x+9)

Math
lim x infnitive (4x-1/2x+9)

chemistry
Write a net equation for the reaction between aqueous solutions of HClO4 and NaH2PO4.

Electronic Timing inc
abc

Chemistry- Solubility Curves
who cares

6th grade
your introduction is important because this is where the reader decides if your story is boring or not. firstly you should have some sort of grabber to get the readers attention then you should go on to state your three reasons and try to make each a sentence. lastly you shoul...

9th grade
what citrus fruit will power a LED light bulb for the longest period of time.

Finance
20. TexMex Products is considering a new salsa whose data are shown below. The equipment that would be used would be depreciated by the straight-line method over its 3-year life, would have zero salvage value, and no new working capital would be required. Revenues and other op...

Statistics
Find the probability that at most 5 defective bolts will be found in a box of 200 bolts if it is known that 2 per cent of such bolts are expected to be defective .(you may take the distribution to be Poisson; e-4= 0.0183).

economics
Different market structures are prevailing in our different sectors like agriculture, power supply, transport industry, cement industry, restaurants, etc. Analyze and compare the characteristics of all market structure with respect to the given sectors.

world history
What are the legends about qutb minar?

social studies
what were politicians who supported a moderate tariff and federal help for the state called

poetry essay
I'm having problems coming up with a thesis statement for Edgar Allen Poe's poem The Raven. I have to do an analysis paper. Any suggestions on where to begin?

Lord of the Flies- English
What is the significance of Piggy's plea to join the expedition? -Thanks I have never read this book -- and don't plan to! But you can check at these sites for some ideas. www.sparknotes.com/lit www.pinkmonkey.com www.enotes.com www.gradesaver.com/classicnotes/titles w...

History
who was the Chinese philosopher that taught the importance of good moral character and take responsibility for their society? Confucius

English
I have to write a poetry analysis paper. I do not know how to start the first paragraph. Do I startwith telling the teacher what I'm writing on and then go into the different parts or should i take another approach? I'll give you some of the best links I've found. ...

math
Find the second derivative. y = sqrt(3x+4) I will be happy to critique your work. We don't do it for you. Thanks. Please post under one name. Thanks. who are u?

math
A widget factory has fixed costs of 35 billion dollars and variable costs of 781 million dollars per widget. The revenue (in $ billions) from selling x number of widgets is given by the following for x between 0 and 60. R(x) = 0.11 (60x - x2) What is the marginal profit (in $ ...

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