Saturday

April 18, 2015

April 18, 2015

Total # Posts: 129

**Math, statistics**

Problem 1: The PDF of exp(X) (6/6 points) Let X be a random variable with PDF fX. Find the PDF of the random variable Y=eX for each of the following cases: For general fX, when y>0, fY(y)= Solution: f_x(ln(y))/y When fX(x) = {1/3,0,if −2<x≤1,otherwise, we ...
*March 31, 2015*

**math, algebra**

If Will gives Molly $9 dollars he will have the same amount of money as her. If Molly give Will $9, the ratio of money she has to the money will has will be 1:2. How much money does will have in the beginning? Can you give me an explanation of each step, please? I'm having...
*January 28, 2015*

**math**

Thanks, Steve :D
*January 15, 2015*

**math**

Bella spent 4/7 of her money on a dictionary and 3 identical books. She spent 1/6 of the remainder on a journal that cost $7. How much did she spend on the dictionary and 3 books? If 3/8 of the cost of the dictionary was the same as 1/2 of the total cost of 3 books, how much ...
*January 15, 2015*

**psychology**

Ms. Sue is a nasty piece of work.
*December 15, 2014*

**math**

3/4 of seats in a concert hall were occupied. The ratio of adults to children was 7:3. If 90 more adults attended the concert, the number of adults would be 3 times of number of children. How many seats were in the concert hall?
*November 23, 2014*

**English MS. SUE**

IDK
*November 18, 2014*

**physics**

A bear spies some honey and takes off from rest, accelerating at a rate of 1.9 m/s^2. If the honey is 17m away, How fast will the bear be going when he gets to the honey?
*October 22, 2014*

**chemistry **

How many grams of HCl are formed from reaction of 3.58g of H2 with 8.90g of Cl2?
*October 16, 2014*

**Chemistry **

A solution of ammonia and water contains 1.60×1025 water molecules and 8.50×1024 ammonia molecules. How many total hydrogen atoms are in this solution?
*October 8, 2014*

**CHEMISTRY**

A sprinter set a high school record in track and field, running 200.0 m in 21.5s . What is the average speed of the sprinter in kilometers per hour?
*October 6, 2014*

**Algebra1**

How to do work out C+4=-24
*September 2, 2014*

**Math**

Group C ate 4/6 of a pizza, or 2/3. Checks out: Grp A = 6/6 (1 pizza); Grp B = 8/6 (1 1/3 pizzas); Grp C = 2/3 of a pizza. The info provided means we can solve for the portions of pizzas consumed, but not in "units" of slices. Check by adding up the fractions: 18/6 = 3.
*April 24, 2014*

**6th Grade Math**

Aiden has 7/10 cup cereal, 2 2/3 cups pretzels, 1/6 cup raisins and 2/5 cup chocolate chips to make a party mix. How much party mix will he have in all if he uses all the ingredients he has?
*April 13, 2014*

**Science**

1) b. fossils 2) d. the discovery of abrupt change in DNA in a species after many generations of no change. Yes, these are correct, I've done them myself.
*November 15, 2013*

**Calc**

Let F(x, y, z) = z tan−1(y^2)i + z^3 ln(x^2 + 10)j + zk. Find the flux of F across S, the part of the paraboloid x^2 + y^2 + z = 19 that lies above the plane z = 3 and is oriented upward. Thanks! STudying for a quiz... *tan−1 is tan^(-1)
*November 10, 2013*

**Math**

20+40=60
*October 9, 2013*

**math**

Let V be the volume of the solid that lies under the graph of f(x,y)= (52 − x^2 − y^2)^1/2 and above the rectangle given by 4 ≤ x ≤ 6, 0 ≤ y ≤ 4. We use the lines x = 5 and y = 2 to divide R into subrectangles. Let L and U be the Riemann ...
*September 14, 2013*

**ECON**

For your twenty-first birthday, your grandfather offers you a gift of $1000 today. However you have the choice of waiting 3 years and receiving $1500 or waiting 5 years and receiving $3000. If your money grows at a rate of 8 percent compounded annually, which alternative ...
*September 7, 2013*

**STATISTICS**

0.05
*August 6, 2013*

**math**

how do i find the measure of central angle rounded to the nearest degree then showing using graphs and degrees
*May 10, 2013*

**Physics**

Consider the stability of a ladder of mass m and length L leaning against a wall. A painter wants to be sure the ladder will not slip across the floor. He knows that the frictional force exerted by the floor on the bottom end of the ladder is needed to keep the ladder in ...
*May 8, 2013*

**Physics**

^^ That is incorrect
*May 8, 2013*

**Physics**

The sled is stuck in the snow. A child pulls on the rope and finds that the sled just barely begins to move when he pulls with a force of 24 N, with the rope at an angle of θ = 33° with respect to the horizontal. The mass of the sled is 14 kg. If the child continues ...
*May 8, 2013*

**Physics**

The roller coaster starts with a velocity of 16 m/s. One of the riders is a small girl of mass 26 kg. Find her apparent weight when the roller coaster is at locations B and C. At these two locations, the track is circular, with the radii of curvature given. rB = 10 m, rC = 20 ...
*May 8, 2013*

**PHYSICS**

A truck has a momentum of 5.8x10^4 Ns [S]. An average force of 2.2x10^3 N [S] increases the truck's momentum for the next 8.8s. What is the impulse and final speed of the truck?
*April 5, 2013*

**PHYSICS**

Max is throwing a 57g tennis ball upward and hitting it (with a racket) when it reaches the top of its flight. If the racket exerts an average force of 440N on the ball, find the speed of the ball after the collision (if they are in contact for 4.5ms)
*April 5, 2013*

**PHYSICS**

A baseball of mass 148g is travelling at 35.0m/s [E] collides with a baseball bat. the collision lasts for 1.10ms. After the collision, the baseball travels at 52m/s [W]. What is the force of the bat on the baseball
*April 5, 2013*

**physics**

An apple (m = 125g) is attached to a vertical spring (from a ceiling) that has a k value of 55 N/m. The apple is held up so the spring is un-stretched. When the apple is released, a) how far will the spring stretch? b) How fast will it be going when it has fallen 4.0cm?
*March 28, 2013*

**physics**

A horizontal spring with k = 45 N/m is attaches a 1.0kg block to a spring hung from the ceiling. A block is pulled down to a spot that is 30.0cm from the spring's rest position. What is it's new acceleration?
*March 28, 2013*

**physics**

A compact car can achieve a maximum acceleration of 3.2 m/s^2. If dice were hanging from the rearview mirror, what angle would they swing on?
*March 24, 2013*

**physics**

A small marble is suspended from a 45 cm string and creates a conical pendulum (like in the picture beside question #57). The marble revolves at constant speed in a horizontal circle with a 6.5 cm radius. Calculate the marble's velocity along the circle.
*March 23, 2013*

**physics**

A ball of mass 0.750 kg is attached to the end of a 1.20m long cord that can withstand a maximum tension of 50.0 N. If swung in a vertical circle, what is the maximum velocity the ball can achieve before the string breaks?
*March 23, 2013*

**Math**

Put two in opposite corners, then two on each side. The corners ones touch two sides....resulting in three marbles on each side.
*February 18, 2013*

**Science**

Use the following values for mass and charge: an electron has mass me = 9.11×10-31 kg and charge -e, a proton has mass mp = 1.67×10-27 kg and charge +e, an alpha particle has mass malpha = 6.65×10-27 kg and charge +2e, where e = 1.60×10-19 C. An ...
*February 6, 2013*

**Science**

Use the following values for mass and charge: an electron has mass me = 9.11×10-31 kg and charge -e, a proton has mass mp = 1.67×10-27 kg and charge +e, an alpha particle has mass malpha = 6.65×10-27 kg and charge +2e, where e = 1.60×10-19 C. An ...
*February 6, 2013*

**french**

how to make "nous allons en classe pendant le week-end" negative
*December 4, 2012*

**Physics**

An electrical generating plant operates at a boiler temperature of 220 deg C and exhausts the unused heat into a nearby river at 18 deg C. what is the maximum theoretical efficiency of the plant?
*November 19, 2012*

**Physics**

Would the answer be B because the temperatures are denoted in deg C? 556K - 273 = 283 deg C.
*November 19, 2012*

**Physics**

A pond with a flat bottom has a surface area of 820 m^2 and a depth of 2.0m. on a warm day, the surface water is a temperature of 25 deg C, while the bottom of the pond is at 12 deg C. Find the rate at which energy is transferred by conduction from the surface to the bottom of...
*November 18, 2012*

**Physics**

A student drops two metallic objects into a 120 g steel container holding 150 g of water at 25°C. One object is a 200 g cube of copper that is initially at 85°C, and the other is a chunk of aluminum that is initially at 5°C. To the surprise of the student, the ...
*November 18, 2012*

**Physics**

How long would it take a 1.00 x 10^3 W heating element to melt 2.00kg of ice at -20 deg C, assuming all energy is absorbed by the ice?
*November 17, 2012*

**Physics**

How long would it take a 1.00 x 10^3 W heating element to melt 2.00kg of ice at -20 deg C, assuming all energy is absorbed by the ice?
*November 16, 2012*

**Chinese**

This character is ma (neutral), correct? Thank you. 吗
*August 29, 2012*

**Algebra 1**

You're welcome! Sorry I couldn't explain it to you better earlier.
*August 29, 2012*

**Algebra 1**

*put
*August 29, 2012*

**Algebra 1**

Okay. For this type of problem, you'll need to make sure your two numbers can compare. This means you're going to have to change your decimal (.3) to a fraction. .3 is said, "three tenths," So you take your 3 and but it over the 10 (3/10). Now you have 3/14 ...
*August 29, 2012*

**Algebra 1**

Please tell me what you don't understand, Dani.
*August 29, 2012*

**Algebra 1**

I made a mistake on my answer. A larger denominator would be the smaller number if the numerators are the same.
*August 29, 2012*

**Algebra 1**

Damon, I think you misunderstood me. I realize that .3 is equivalent to 3/10. I was answering the question, not responding to YOUR answer.
*August 29, 2012*

**Algebra 1**

You have 3/14 and you're comparing that to 0.3. This means you will have to convert .3 to a fraction. Find the common denominator. You will clearly see the answer. Remember, whenever your numerators are the same, the number with the larger denominator is larger. The ...
*August 29, 2012*

**science**

"The cytoplasm gives the cell its shape"
*August 27, 2012*

**acct**

Assume that equipment with a balance in the equipment account of $7,200 is discarded. The balance in the Accumulated Depreciation account is $4,900. Cash is received for the equipment totaling $2,600. Please give the journal entry to record the write-off of equipment discarded.
*June 24, 2012*

**college mathematics\**

greater than 3: 3/6=1/2 less than 5: 4/6=2/3
*June 11, 2012*

**biology**

In rabbits, there are four different versions of gene for coat color. What pattern of inheritance is this?
*May 24, 2012*

**physics **

Two small, identical metal spheres contain excess charges of -10.0 x 10^-6 C and 6.0 x 10^-6 C, respectively. The spheres are mounted on insulated stands and placed 0.40 m apart. Determine the magnitude and direction of the force between the spheres.
*May 16, 2012*

**pre-calculas**

An object is situated so that its center of mass is located at the origin.Three forces X,Y, and Z act on the object at the same time. Force X passes through the point (-3, -4), forve Y passes through the point (5,-12), and force Z passes throught the point (15,8). Forces X,Y, ...
*May 10, 2012*

**physics**

A speeder traveling at 47 m/s passes a motorcycle policeman at rest at the side of the road. The policeman accelerates at 2.59 m/s2. To the nearest tenth of a second how long does it take the policeman to catch the speeder?
*February 20, 2012*

**physics**

A car accelerates at a constant rate from zero to 28.7 m/s in 10 seconds and then slows to 17.5 m/s in 5 seconds. What is its average acceleration to the nearest tenth of a m/s2 during the 15 seconds?
*February 20, 2012*

**4th grade math**

M says that every number in the nineties is composite.J says that one number in the nineties is prime. who is correct?
*January 11, 2012*

**English**

his test in particular is outrageous. I too am in Connections and have attended every live lesson none of which prepared me for this exam. It is very, very objective with the questions being non specific of which I can argue more thanone possible answe and depending on my ...
*January 9, 2012*

**world geography**

Rocky Mountains
*December 22, 2011*

**physics**

A man throws a ball straight up in the air with an initial speed of 24 meter per second. How long does it take for the ball to return to him? What is the maximum height of the ball above the point where it was thrown?
*December 6, 2011*

**Chemistry**

Why would the percent recovery obtained over 100% in a an experiment dealing with the cyclic chemical reactions of copper?
*October 26, 2011*

**college math**

Random-gain values: 50-20 = 30 ; -20 Probabilities: 1/60 ; 59/60 ----------- E(gain)= 30(1/60)-20(59/60) = 1/2 - (59/3)= (3-59)/6 = -$9.33 ---- A fair price would be 20-9.33 = $10.67
*October 23, 2011*

**Precalculus**

Solve 5x^3 – 6x^2 – 4x – 8 = 0
*October 18, 2011*

**physics**

A stone falls from rest from the top of a cliff. A second stone is thrown downward from the same height 3.3 s later with an initial speed of 64.68 m/s. They hit the ground at the same time. The acceleration of gravity is 9.8 m/s2 . How long does it take the first stone to hit ...
*September 19, 2011*

**math**

Tom has a total of 95 beads. He has 20 more red beads than blue beads. He has twice as many white beads as red beads. How many blue beads does Tom have?"
*September 19, 2011*

**algebra**

but i dont know how to get there
*September 12, 2011*

**algebra**

write each problem in form ax^p +bx^q p and q are rational numbers [x^2-4x^(1/2)]/2x^(1/3) the answer is 1/2x^(5/3)-2x^(1/6)
*September 12, 2011*

**mathematics**

12
*August 21, 2011*

**Statistics- Standard Error**

dfsdf
*July 26, 2011*

**Math-geometry**

Valid
*July 12, 2011*

**socialogy**

In what ways is the health problem affected by the family, the economy, and the polity? What innovations could help ameliorate the health problem
*July 7, 2011*

**College Mathematics**

Equivalent
*July 6, 2011*

**English**

spelling practice book
*May 4, 2011*

**spelling practice**

food for large animals
*April 5, 2011*

**Math**

TODAY
*March 27, 2011*

**engr 109**

Calculate the resistance of a 1 mile length of wire if the conductivity (sigma) is 5.7x10^5 (ohm-cm)^-1 and the diameter of the wire is 1 inch. The formula for resistance is R = length/(sigma*Cross-sectional area) but all of the units must be consistent. The correct answer is ...
*February 18, 2011*

**physics**

Stand on a 200 meter high building and, at noon, drop a ball. At what time does it hit the ground
*February 17, 2011*

**math**

18/14=90/?
*January 3, 2011*

**Accounting**

Partial balance sheets for ABC Company and additional information are provided below. ABC Company, Partial Balance Sheets, As of December 31 2009 2008 Equipment $100,000 $75,000 Accumulated depreciation (25,000) (20,000) Common stock, $5 par 180,000 100,000 Paid in capital 20,...
*December 17, 2010*

**Chemistry 20**

a) If the pressure and volume of a gas both increase, will the temperature increase or decrease? b) If the pressure is doubled and the volume is tripled, by what factor must the temperature increase or decrease? c) If the pressure of the gas is decreased by removing some of ...
*November 6, 2010*

**Physics**

three vectos are shown in fig. 3-32. their magnitudes are given in arbitrary units. Determine the sum of the three vectors. Give the resultant in terms of (a) components, (b) magnitude and angle with the x axis. (3-32 --the figure has three rays all starting at the origin. Ray...
*October 3, 2010*

**math**

The period T (time in seconds for one complete cycle) of a simple pendulum is related to the length L (in feet) of the pendulum by the formula 8T^2=Pi^2L. If a child is on a swing with a 10-foot chain, then how long does it take to complete one cycle of the swing?
*July 18, 2010*

**human service management**

What considerations should managers be aware of when administering progressive discipline? What considerations should managers be aware of when administering positive discipline? Explain the effect of the employment-at-will principle on the progressive and positive discipline ...
*June 8, 2010*

**Macroeconomics**

rd
*June 7, 2010*

**Physics**

A ball of mass oscillates on a spring with spring constant = 200 . The ball's position is described by (0.350 ) 16.0 with measured in seconds. -What is the amplitude of the ball's motion? -What is the frequency of the ball's motion? -What is the value of the mass...
*April 28, 2010*

**Financial Management**

9.1
*March 28, 2010*

**math**

algebra in 8th your teacher is giving you a test worth 100 points containing 40 questions. There are two-point and four-point questions on teh test. how many of each type of questions are on the test?
*February 7, 2010*

**chemistry**

To extract gold from its ore, the ore is treated with sodium cyanide solution in the presence of oxygen and water. 4 Au(s) + 8 NaCN(aq) + O2(g) + 2 H2O(l) 4 NaAu(CN)2(aq) + 4 NaOH(aq) Determine the mass of gold that can be extracted if 27.4 g sodium cyanide is used.
*February 3, 2010*

**chemistry**

To extract gold from its ore, the ore is treated with sodium cyanide solution in the presence of oxygen and water. 4 Au(s) + 8 NaCN(aq) + O2(g) + 2 H2O(l) 4 NaAu(CN)2(aq) + 4 NaOH(aq) Determine the mass of gold that can be extracted if 27.4 g sodium cyanide is used.
*February 3, 2010*

**Org. Chem.**

CH3CH2C(=O)CH2CH3
*January 27, 2010*

**10th grade**

An unsaturated solution is made by completely dissolving 20.0 grams of NaNO3 in 100.0 grams of water at 20.0°C. (the gram formula mass=85.0 grams per mole) Determine the minimum mass of NaNO3 that must be added to this unsaturated solution to make a saturated solution at ...
*December 25, 2009*

**elementary math for teachers **

25 meters
*October 15, 2009*

**Regent (Math)**

I apologize for being impatient
*July 28, 2009*

**Regent (Math)**

It will be really appreciated for answering the question.
*July 28, 2009*

**Regent (Math)**

I know i am not suppose to ask this kind of question but I thought the teachers here can help me. The question is : Retaking the regent: Good or bad thing? I live under the NYCDOE. I am retaking a regent back. However, the question is that if i take regent back, would only the...
*July 28, 2009*