Sunday

August 28, 2016
Total # Posts: 685

**science**

What is the molarity of a solution of sodium chloride which contains 0.5moles in 200cubic centimeters? #2.what volume of 1m solution of hcl will contain 10moles?
*August 2, 2016*

**physics**

a helium atom is in one of its single states.one of the electrons is in an p-state and the other a D-sate.the atom is placed in a magnetic field,B,of strengh 3 tesla. sketch a diagram showing the degenerated states and all permissible transition from D-state b)Determine by how...
*April 27, 2016*

**Hamlet**

How does Hamlet show his Heroism?
*April 17, 2016*

**math**

70/800 8.75%
*March 17, 2016*

**math**

70/800
*March 17, 2016*

**math **

in an experiment, it was found that 70 out of 800 animals were happy in their surroundings. a find probability that an individual animal is happy in their surroundings. b. represent as a percent
*March 17, 2016*

**math**

second half is if both marbles are green
*March 17, 2016*

**math**

a box contains seven red marbles, five green marbles & eight blue marble. a marble is drawn at random & is replaced. a second marble is then draw from the jar. find the probabilty that both marbles are green
*March 17, 2016*

**math**

4 red marbles, 3 green, 2 yellow. you pick 2 at random.What is probability of a. 1 yellow & 1 red b. 2 green
*March 17, 2016*

**math**

a box contains seven red marbles, five green marbles & eight blue marble. a marble is drawn at random & is replaced. a second marble is then drawn from ther jar. find the probabilty that the first marble is red & second is green
*March 17, 2016*

**Descriptive Physics**

You are standing 5 feet from one speaker and 14 feet from another. Both speakers are producing the same sound. If the combined sound from both speakers is especially loud at your location, which of the following could be the wavelength of the sound? Choose all that apply. 1 ...
*March 13, 2016*

**math**

I am a number less than 3,000.When you divide me by 32, my remainder is 30. When you divide me by 58, my remainder is 44. What number am I.
*January 13, 2016*

**physics**

Pure helium is closed into cylinder with a movable piston. The initial volume, pressure, and temperature of the gas are 15 dm3, 2·105 Pa, and 300 K, respectively. If volume is decreased to 12 dm3 and the pressure increase to 3.5·105 Pa find the final temperature of ...
*January 11, 2016*

**physics**

A police car siren emits a sound wave with a frequency fs = 400 Hz and it is moving toward the wall at 25 /m/s. What frequency reflected from the wall does the driver of the police car hear ? The speed of sound is 340 m/s.
*January 11, 2016*

**math**

Dee used 2 1/3 cups of sugar for a cake recipe.If the amount of sugar the container holds is 3 times the amount she used,does the container hold more than,less than,or equal to 3 cups of sugar
*December 3, 2015*

**math**

Derek ran 3/8 of a race he had to stop for a break.If the race is 6 miles long,did Derek run more than,less than,or equal to 6 miles before he took a break?
*December 3, 2015*

**math**

Maresol spent 4/5 of her allowance on a pair of jeans.If she recieved $15 for allowance,did Maresol spend more than,less than,or equal to $15 on the jeans?
*December 3, 2015*

**Physics**

A ball with a mass of 4 kg and a velocity of 10 m/s strikes an 8kg ball that is initially at rest. If the collision is perfectly elastic, what are the velocities of the 4 kg and 8 kg ball after the collision?
*December 2, 2015*

**math 5 grade**

1: it is saying, six people are sleeping, to find total it is 8 1/2 + 8 1/2 + 8 1/2 + 8 1/2 + 8 1/2 + 8 1/2. and your answer came out to be 51. TRUE :) 2: 6 1/2 * 1 1/2 is 13/2 * 3/2 which is 39/4! this is really 9 3/4 WHICH IS NOT 10! Oliva is wrong! hahaha! so that is your ...
*December 2, 2015*

**math**

maresol spent 4/5 of her allowance on a pair of jeans.if she received $15 for allowance,did maresol spend more than,less than,or equal to 3 cups of sugars?explain
*December 2, 2015*

**Chemestry**

2Fe + 3O2 --> 2Fe2O3
*December 2, 2015*

**Biology: Genetics**

that's true, also nucleotides affect DNA in deciding what it codes for; therefore it is affecting structure in general.
*December 2, 2015*

**Math**

A train leaves San Diego at 1:00 PM. A second train leaves the same city in the same direction at 4:00 PM. The second train travels 78 mph faster than the first. If the second train overtakes the first at 6:00 PM, what is the speed of each of the two trains?
*December 2, 2015*

**Vani school**

1 whole pizza, also quick grammar lesson, of each pizza* <3
*December 2, 2015*

**Geometry**

6/30 proportion of his height to where he is standing x/45 what we don't know and the distance of the flag pole 6/30=1/5 simplifying x/45 1/5=x/45 setting them equal x=9 if we sole we will get this For further help/ understanding draw the picture and see how these ...
*December 1, 2015*

**Language arts**

what about the Essay??
*December 1, 2015*

**Algebra**

a farmer fences off a small.rectangular plot of land thay is 60 feet by 100 feet. within that area, a garden is planted and surrounded by a walkway of uniform width. how wide is the walkway if the area of the planted area is one half of the area of the plot?
*December 1, 2015*

**math**

How can x-8 be modeled by being described as a situation? Answer:8x
*November 11, 2015*

**Finance**

Problem 10-32 Project Evaluation [LO1] Aria Acoustics, Inc. (AAI), projects unit sales for a new seven-octave voice emulation implant as follows: Year Unit Sales 1 86,000 2 99,000 3 113,000 4 108,000 5 89,000 Production of the implants will require $1,650,000 in net working ...
*November 7, 2015*

**U.S. History (Check)**

good job
*October 13, 2015*

**Math**

A bag contains 5 red, 7 yellow, 8 green, and 3 blue markers. What is the p(two green markers) will be chosen if the markers are not replaced as they are chosen?
*September 1, 2015*

**calculus**

A snowball is melting at the rate of 2 inches per hour. How fast is the surface area of the snowball changing at the instant the snowball has a radius of 3 inches i tried (d/dt) = 4pir^2 (dr/dt) its multiple choice and -72pi isnt there so im just trying to figure this out
*August 28, 2015*

**Physics**

Which one of the following actions would make the maxima in the interference pattern from a grating move closer together? A.Increasing the distance to the screen. B.Increasing the number of lines per length. C.Decreasing the number of lines per length. D.Decreasing the ...
*August 11, 2015*

**BUSINESS STUDIES**

Q1.With the aid of a diagram discuss the marketing systems Q2.Discuss the problems that occur when universities and industry form joint ventures for research purposes.How have these problems been solved?
*July 8, 2015*

**probability**

E[T]=9
*May 16, 2015*

**chemistry**

under what conditions could the decomposition of Ag2O(s) into Ag(s) and O2(g) proceed spontaneously at 298 K? 2Ag2O(s)---->4Ag(s)+O2(g) dG=22.42 Kj answer= 0.000118 atm.
*May 9, 2015*

**chemistry**

dG for the formation of Hi(g) from its gaseous elements is -20.2 kj/mol at 500k. when the partial pressure of HI is 10 atm, and I2 0.001 atm, what must the partial pressure of hydrogen be at this temperature to reduce the magnitude of dG for the reaction to 0. H2(g)+I2(g)----&...
*May 9, 2015*

**college chemistry**

at its melting point, O c, the enthalpy of fusion of water is 1.435 kcal/mol. what is the molar entropy change for the melting ice at 0C? answer: 5.26 cal/mol-k
*May 9, 2015*

**college chemistry**

thanks
*May 9, 2015*

**college chemistry**

for the reaction at 298 K 2A+b ---->C enthalpy=100 K/cal entropy= 0.050 kcal/k assuming enthalpy and entropy to be constant over the temperature range, at what temperature will the reaction become spontaneous? answer: T>2000K
*May 9, 2015*

**college chemistry**

im confused i found those as the standard enthalpies and entropies for pcl3? i cant get answer
*May 9, 2015*

**college chemistry**

is it 306.4/33.2?
*May 9, 2015*

**college chemistry**

what is dHvap?
*May 9, 2015*

**college chemistry**

estimate the normal boiling point of Pcl3 answer: 333 K how do you get it?
*May 9, 2015*

**LA**

I need help too
*May 7, 2015*

**Chemistry**

Check my work & answer please. I need to make sure I am able to do this type of problem correctly. A typical car engine produces 44,000 kJ of heat in an hour. The cooling system has a capacity of 8.40 L and is filled with a 50:50 mixture of anti-freeze (specific heat capacity ...
*April 19, 2015*

**Chemistry**

4. A typical car engine produces 44,000 kJ of heat in an hour. The cooling system has a capacity of 8.40 L and is filled with a 50:50 mixture of anti-freeze (specific heat capacity of 8.37 J/g-oC, density of 1.038 g/mL). In maintaining a constant engine temperature, the ...
*April 18, 2015*

**Physics**

A 1100- kg car collides with a 1400- kg car that was initially at rest at the origin of an x-y coordinate system. After the collision, the lighter car moves at 20.0 km/h in a direction of 25 o with respect to the positive x axis. The heavier car moves at 23 km/h at -50 o with ...
*April 16, 2015*

**Earth Science**

You doing this? pkwy.k12.mo.us/homepage/skang/file/Astronomy%20Review.pdf From here the answer would be C - Full moon.
*April 9, 2015*

**Math**

Volume of cube = 1ml How many ml in 1.5L?
*April 9, 2015*

**science**

Compare today's temperature of the universe to the temperature of the universe right after the big bang. That will give you your answer.
*April 9, 2015*

**science**

The average temperature of the universe today is approximately 2.73 kelvins (−270.42 °C; −454.76 °F), based on measurements of cosmic microwave background radiation. What was it like back then?
*April 9, 2015*

**science**

I'm sorry but please reread the article. We even quoted the answers for you but you don't want to put any effort into reading them and trying to figure out what the quotes are saying. You want the answer to be handed you.
*April 9, 2015*

**science**

Thank you Ms. Sue
*April 9, 2015*

**science**

2 - 3 paragraphs down it says... "For the first 380,000 years or so, the universe was essentially too hot for light to shine, according to France's National Center of Space Research " Miss that too?
*April 9, 2015*

**science**

You obvously didn't read it. The very first sentence in that post the Ms. Sue posted is "The universe was born with the Big Bang as an unimaginably hot, dense point." ... how did you miss that??
*April 9, 2015*

**math**

As Ms. Sue mentioned you posting under many names today. Instead of asking questions, why not try to help others or even at least do some work on your questions instead of guessing. I don't mean to be rude here.
*April 9, 2015*

**math**

Wrong. Its B The office building is designed with n floors and each floor is 3.9m right so you have right now: 3.9n On top of entire office building is a antenna which is 15.85m tall so its 3.9n + 15.85 = h
*April 9, 2015*

**Math**

Yes, your answer is A as mentioned by Steve
*April 9, 2015*

**Calculus**

Thank you so much!
*April 9, 2015*

**Calculus**

Suppose that y=f(x) = sqrt(2x), x>=0 Find a c > 0 such that the tangent line to the curve y = f(x) at x = c has the same slope as the tangent line to the curve y = f^–1(x) at x = c. You get: c = 1/8 c = 1/2 c = (1/8)^(1/3) c = (1/3)^(2/3) c = (1/2)^(1/3)
*April 9, 2015*

**math**

coin = 1/2 Cube has number 1, 2, 3, 4, 5, and 6 so 2, 4, 6 are even numbers which is 1/2 of the cube So 1/2*1/2 = 1/4
*April 9, 2015*

**Calc AB**

Thank you. I was taking the inverse of (x+3)^3 + 2 and then I got stuck after that.
*April 9, 2015*

**Calc AB**

Let f(x) = (x+3)^3 + 2. The graph of the inverse function y = f^–1(x) has a vertical tangent at: (Hint: Think about the symmetry of the 2 graphs.) (66, 1) (2, –3) (10, –1) (–3, 2) (–1, 10)
*April 9, 2015*

**Math**

Got this one. Its 1/24 correct?
*April 9, 2015*

**Math**

Suppose f(x) = 4x^5-(1/x^4) Find the slope of the tangent line to the graph of y = f^–1(x) at (3, 1). You get: 1/24 1/16 00062 1620 972
*April 9, 2015*

**Calc AB**

Are you possibly Steve Hawkins? Your getting this one after another.
*April 9, 2015*

**Calc AB**

Suppose that f(x) is an invertible function (that is, has an inverse function), and that the slope of the tangent line to the curve y = f(x) at the point (2, –4) is –0.2. Then: (Points : 1) A) The slope of the tangent line to the curve y = f –1(x) at the point...
*April 9, 2015*

**Math**

It was B
*April 9, 2015*

**Math**

B??
*April 9, 2015*

**Math**

derivative: sin(pi*cosx) = -pi sin(x) cos(pi cos(x))
*April 9, 2015*

**Math**

Inverse of sin(pi*cosx) = cos^(-1)((sin^(-1)(x))/pi) Derivative of cos^(-1)((sin^(-1)(x))/pi) is -1/(sqrt(1-x^2) sqrt(pi^2-sin^(-1)(x)^2))
*April 9, 2015*

**Math**

Suppose f(x) = sin(pi*cosx) On any interval where the inverse function y = f –1(x) exists, the derivative of f –1(x) with respect to x is: a)-1/(cos(pi*cosx)), where x and y are related by the equation (satisfy the equation) x=sin(pi*cosy) b)-1/(pi*sinx*(cos(pi*cosx...
*April 9, 2015*

**Calc AB**

c)(1/2)x^(-1/2) is the correct answer
*April 9, 2015*

**Calc AB**

Wait f^-1(x) is 2sqrt(x) so then the derivative of that is 1/sqrt(x)
*April 9, 2015*

**Calc AB**

That would be 1/(dy/dx) of x^2-4x+4 which would be 1/2x-4 correct?
*April 9, 2015*

**Calc AB**

Suppose that y = f(x) = x^2-4x+4 Then on any interval where the inverse function y = f^–1(x) exists, the derivative of y = f^–1(x) with respect to x is: a) 1/(2x-4) b) 1/(2y-4), where x and y satisfy the equation y=x^2-4x+4 c)(1/2)x^(-1/2) d)(1/2)x^(1/2) e) Both 1/(...
*April 9, 2015*

**Calculus AB**

Yep I was correct
*April 9, 2015*

**Calculus AB**

well lets see. Since f^-1(x) = 9-x^2 then the derivative of 9-x^2 is -2x correct?
*April 9, 2015*

**Calculus AB**

For the function f(x) = sqrt(9-x), which is equal to d/dx(f-1( -1 is the inverse)(x)) a) -2x b) sqrt(x) + 9 c) x^2 + 9 d) 2x e) 9-x^2
*April 9, 2015*

**Calculus**

Answer is 1/(2y-4) where x and y are related by the equation (satisfy the equation) x=y^2-4y+5 x>= 1
*April 9, 2015*

**Calculus**

inverse of x^2 - 4x +5 is 2±sqrt(x-1) and the derivative of that is (2x-4) but I don't know how to get the x>= 1 or x>= 2
*April 9, 2015*

**Calculus**

For the function f(x) = x^2 - 4x +5, x>= 2, which is equal to d/dx (f-1 this is the inverse)(x)) ? 1/(2y-4) where x and y are related by the equation (satisfy the equation) x=y^2-4y+5 x>= 1 2y-4 where x and y are related by the equation y= = x^2 - 4x +5, x>= 2 1/2x-4 ...
*April 9, 2015*

**Calc AB**

I believe that it is Either I or III
*April 9, 2015*

**Calc AB**

Remember that f(x) must be one-to-one (only one y-value for each x-value) over the domain where f –1(x)is defined as a function. So, in some cases you must restrict the domain of f(x) so that it's one-to-one. There might be more than one section of domain that's ...
*April 9, 2015*

**Calc**

Figured it out. 33/2
*April 9, 2015*

**Calc**

Find the area of the region bounded by the curves y2 = x, y – 4 = x, y = –2, and y = 1. So far I have found that the area of the trapezoid which is 13.5. But for the other two areas I cannot find them. They could be: 27/2 22/3 33/2 34/3 14 I believe that it is 14 as ...
*April 9, 2015*

**Physics**

A rock is thrown directly upward from the edge of the roof of a building that is 35.3 meters tall. The rock misses the building on its way down, and is observed to strike the ground 4.00 seconds after being thrown. Neglect any effects of air resistance. With what speed was the...
*March 21, 2015*

**science**

Measuring the speed of light thru gelatin using a laser
*March 4, 2015*

**algebra**

Use the formula d = 1.22ãx to estimate how many miles a 5-foot-tall person can see standing on the deck of a ship that is 50 feet above the ocean.
*February 9, 2015*

**Physics**

A gardener pushes a mower at a distance of 900 m while mowing the yard. The handle of the mower makes an angle of 40.0 with the ground. The gardener exerts a force of 35.0 n along the handle of the mower. How much work does the gardener do in mowing the lawn?
*January 26, 2015*

**Science**

no its alleles
*November 6, 2014*

**science**

Hey thanks.
*November 6, 2014*

**science**

is a starch a complex carboydrate
*November 6, 2014*

**science**

is a complex sugar an example of a starch? is a simple sugar an example of glucose?
*November 6, 2014*

**science**

are starches and glucose all types of carbohydrates?
*November 6, 2014*

**Math**

Find the coordinates of the point at 180 degrees on a circle of radius 3.4 centered at the origin. Round your answers to three decimal places, if required. ( , 0 ) I got 0 as the y coordinate. Please help me solve for x
*October 24, 2014*

**math**

A craft store bought paint for a wholesale price of 100 the store charges a 65% markup what is the craft stores price for the paint.
*October 21, 2014*

**math**

From a box containing 5 blue marbles,10 red marbles,and 8 yellow marbles,Lisa removed 3 marble,one of which was blue.f she removes one more marble at random,what is the probability that it will be blur? a. 1/4 b. 5/21 c. 1/5 d. 2/7 e. 1/6 please answer and explain
*October 16, 2014*