Wednesday

August 20, 2014

August 20, 2014

Total # Posts: 1,823

**math**

if sin(x+α)=2cos(x-b) show tan x such that : tan x=(2-tan α)/(1-2 tan α)
*December 5, 2012*

**Chemistry**

Place the following elements in order of decreasing atomic size: selenium, chlorine, fluorine, rubidium, calcium, and sulfur.
*December 2, 2012*

**Probability**

Can someone please help me. A single card is selected from a standard 52-card deck. B= the drawn card is black; R= the drawn card is red; Q= the drawn card is a queen; F= the drawn card is a face card ( a king, queen or jack). Without finding the probabilities, determine if B ...
*December 1, 2012*

**Probability**

Can someone please help me? certain medical diagnostic test is used to determine if people have pinkyitis and it is known that 1 in 1300 Americans has the disease. The test correctly diagnoses the presence of pinkyitis 97% of the time and it correctly diagnoses the absence of ...
*December 1, 2012*

**Math**

Can someone please help me. A single card is selected from a standard 52-card deck. B= the drawn card is black; R= the drawn card is red; Q= the drawn card is a queen; F= the drawn card is a face card ( a king, queen or jack). Without finding the probabilities, determine if B ...
*December 1, 2012*

**Math **

Can someone please help me? certain medical diagnostic test is used to determine if people have pinkyitis and it is known that 1 in 1300 Americans has the disease. The test correctly diagnoses the presence of pinkyitis 97% of the time and it correctly diagnoses the absence of ...
*December 1, 2012*

**Math**

Volunteers working to raise funds for a new community library sold 1000 raffle tickets at $10 each. Tickets are to be randomly drawn and prizes are awarded as follows: one prize of $1,000, twenty prizes of $50 and one hundred prizes of $20. What is the expected value of this ...
*December 1, 2012*

**College Math**

Volunteers working to raise funds for a new community library sold 1000 raffle tickets at $10 each. Tickets are to be randomly drawn and prizes are awarded as follows: one prize of $1,000, twenty prizes of $50 and one hundred prizes of $20. What is the expected value of this ...
*December 1, 2012*

**Statistics**

2.376
*November 30, 2012*

**healthcare commumication**

What are the advantages and disadvantages of using traditional, electronic, and social media for health care communication What are the effects of HIPAA and other regulations on the use of these media for health care communication
*November 30, 2012*

**Chemistry**

The binding energy of electrons in a metal is 194 kJ/mol. Find the threshold frequency of the metal. ----------------- The heat of fusion of ice is 6.00 kJ/mol. Find the number of photons of wavelength = 6.78×10^−6 m that must be absorbed to melt 6.80 g of ice.
*November 28, 2012*

**Calculus**

Find an antiderivative of q(t)=(t+8)^5
*November 27, 2012*

**finance**

The Ault Company made a credit sale of $15,000. The invoice was sent today with the terms, 3/15 net 60. This customer normally pays at the net date. If your opportunity cost of funds is 9% the expected payment is worth how much today?
*November 27, 2012*

**physics**

A model airplane of mass 1.5 kg is attached to a horizontal string and ﬂies in a horizontal circle of radius 5.8 m, making 2 revolutions every 8 s. (The weight of the plane is balanced by the upward “lift” force of the air on the wings of the plane.) The ...
*November 25, 2012*

**physics**

An athlete swings a 3.06 kg ball horizontally on the end of a rope. The ball moves in a circle of radius 0.82 m at an angular speed of 0.25 rev/s. What is the tangential speed of the ball? Answer in units of m/s
*November 25, 2012*

**Math**

What is the truth table for p v ( q arrow going straight across p )
*November 21, 2012*

**Calculus**

Find the area between y=e^-x and y=4(x-x^2.
*November 20, 2012*

**Physical Sci**

John used a force of 300 N to push his younger brother in a wagon for 50m. How much work did John do?
*November 16, 2012*

**statistics**

fhj
*November 15, 2012*

**Chemisty 20**

A sample of water was known to contain chloride ions. To determine the concentration of chloride ions in the water sample, a student added a solution of silver nitrate to 500mL of the water. 1.26g of silver chloride percipitate formed. What was the concentration of chloride ...
*November 14, 2012*

**Calculus**

The velocity of a particle moving along the x-axis is given by f(t)=6-2t cm/sec. Use a graph of f(t)to find the exact change in position of the particle from time t=0 to t=4 seconds.
*November 14, 2012*

**physics**

an object accelerates at 0.8m/s2 when a resultant force of 200n is acting on it what is the mass of the object
*November 13, 2012*

**Calculus**

Find an equation of the tangent line to the curve for the given value of t. x=t^2-2t, y=t^2+2t when t=1
*November 13, 2012*

**physics RC**

wow thank you! book was fairly vague on this subject
*November 10, 2012*

**physics RC**

The potential difference between the plates of a leaky capacitor, C = 3.00 microfarads., drops from 6.80 V. to 3.40 V. in 1.00 s. What is the equivalent resistance (in ohms) between the capacitor plates?
*November 10, 2012*

**math**

what is 11/15 - 7/20
*November 8, 2012*

**fractions from least to greatest**

8/7,5/7,3/7,1,7,4/7
*November 7, 2012*

**Calc 2**

Can someone help me with this one?
*November 5, 2012*

**Calc 2**

Is the series convergent or divergent? n=1 series to infinity (-1)^n * (sqrt(n)/(4+5sqrt(n)) Does this diverge?
*November 5, 2012*

**Calc 2**

Does 3/4 - 3/5 + 3/6 - 3/7 + 3/8.... Converge or Diverge?
*November 5, 2012*

**Calculus 2**

i know that the ratio test is used to figure it out. you first find the limits right?
*November 5, 2012*

**Calculus 2**

Find the radius of convergence and interval of convergence of the series. n=2 series to infinity (-1)^n * x^n+6/n+7 R= ? I= (or[ , ]or) How do i do this?? ( means convergent and [ means divergent.
*November 5, 2012*

**Math**

A frictionless spring with a 7-kg mass can be held stretched 1 meters beyond its natural length by a force of 20 newtons. If the spring begins at its spring-mass equilibrium position, but a push gives it an initial velocity of 0.5 m/sec, find the position of the mass after ...
*November 4, 2012*

**Calc 2**

This is how it looks: hopefully this clarifies it a bit. n^n/(4)^1+3*n
*November 3, 2012*

**Calc 2**

How would I do this one? n=1 to infinity n^n/4^1+3*n Does it absolutely converge, conditionally converge, or diverge? What would I do here?
*November 3, 2012*

**Calculus 2**

thanks!
*November 3, 2012*

**Calculus 2**

Sorry it's *(-5)^n and I don't think its absolutely convergent, am I correct?
*November 3, 2012*

**Calculus 2**

n=1 series to infinity (-5^n)/n^3 does it absolutely converge, diverge or conditionally converge. Would I be applying the ratio test?
*November 3, 2012*

**math**

whats the angle of one end of a 13 ft.by2 by 4 ,,2ft.high and other end level?
*November 3, 2012*

**Computer Science**

Question #1. 1. Say that L is regular over 0, 1. Is the set, {x|x = 0y,y ∈L } also regular? 2. For two regular languages (a) Is M*L=L*M for any alphabet? (b) Is it true if the alphabet is only {0,1}? (c) Is it true if the alphabet is only {0}? 3. If L is regular, is the ...
*November 3, 2012*

**Physics**

You dont have to give me the answer but explaining a way to get there would help
*November 2, 2012*

**Physics**

As part of a physics experiment, you stand on a bathroom scale in an elevator. Though your normal weight is 690 N, the scale at the moment reads 588 N. (a) Is the acceleration of the elevator upward, downward, or zero? (b) Calculate the magnitude of the elevator's ...
*November 2, 2012*

**Physics**

h=1.5 d=2
*November 1, 2012*

**Math**

How do you round 0.0694 to the greatest place?
*November 1, 2012*

**Algebra**

A clothing company makes two basic products- shirts and pants. The company has 50 labor hours per day in the cutting department and 70 hours available in the sewing department. It takes 12 minutes to cut a shirt and 15 minutes to sew it. It takes 13 minutes to cut pants and 18...
*November 1, 2012*

**college math**

two bakeries produce three types of cookies, chocolate chip, sugar, and peanut butter. the cookies are produced in batches containing some of each type of cookie. the cooks will not break up a batch, so you must buy an entire batch of cookies if you want any cookies. mrs. ...
*October 31, 2012*

**algebra**

two bakeries produce three types of cookies, chocolate chip, sugar, and peanut butter. the cookies are produced in batches containing some of each type of cookie. the cooks will not break up a batch, so you must buy an entire batch of cookies if you want any cookies. mrs. ...
*October 31, 2012*

**Calculus 2**

The question is: n=0 E to infinity 4+sin(n)/3^n Does it converge or diverge? i'm doing this hw problem and I believe it converges according to other example? Is this the case?
*October 30, 2012*

**Calculus 2**

Does Series n=1 to infinity 1/2n+1 converge or diverge? I'm thinking it converges, because p would be < 1 right? I'm a little confused.
*October 29, 2012*

**english**

klnlfn
*October 29, 2012*

**Physics**

Just got the answer a little bit ago. Treat it as a roller coaster question. It's work conservation so the total work done by gravity is the total work in the system. This causes the sphere to move forward as well as to rotate. By playing around with the kinetic and ...
*October 26, 2012*

**physics**

If a race car completes a 4mi oval track in 73.2s, what is the average speed in units of mi/h?
*October 23, 2012*

**physics**

If a race car completes a 4mi oval track in 73.2s, what is the average speed in units of mi/h?
*October 23, 2012*

**physics**

If a race car completes a 4mi oval track in 73.2s, what is the average speed in units of mi/h?
*October 23, 2012*

**math**

both are correct, just use a claculator
*October 23, 2012*

**Physical Science**

A block of ice at 0^\circ {\rm C} is dropped from a height that causes it to completely melt upon impact. Assume that there is no air resistance and that all the energy goes into melting the ice. What is the height necessary for this to occur.
*October 18, 2012*

**Calculus**

I got the dz/dy derivative to be: cos(x-y)/sin(x-y) I got the d^2z/dydx derivative to be: -(sin(x-y))^2 - (cos(x-y))^2/ (sin(x-y))^4
*October 16, 2012*

**Calculus**

Find the d^3z/dydx^2 partial derivative of: ln[sin(x-y)] The answer is supposed to be 1/2; however, I cannot figure out how to get this answer. Any help is appreciated.
*October 16, 2012*

**English**

My prompt is: Explain, in an essay with a thesis, why student papers must be relevant and how that relevance is achieved in their writing. (The requirements of this essay include why and how. Address both in the thesis) I'm pretty sure I need to address rhetorical stance ...
*October 14, 2012*

**statistics**

A researcher wants to study the spending habits of customers of a local shopping mall. The mall manager claims that the average spending per customer is $70, but the researcher believes that the average is less than $70. A simple random sample of 350 shoppers is obtained. The ...
*October 13, 2012*

**multplication**

When multiplying is there a rule stating that the numbers being multiplied can't have the same two last numbers as the product or the numbers can't end with the same numbers that were multiplied?
*October 12, 2012*

**Pre-calc**

Use the given zero to find the remaining zeros of the function: h(x)=x^4-15x^3+55x^2+155x-1476 Zero:5-4i I multiplied [x-(5-4i)][x-(5+4i)] and got x^2-10x+9. The example I have says to divide that by h and get a second quadratic equation that is also a factor of h. I have to ...
*October 10, 2012*

**Trig.**

Never mind, I figured it out.
*October 9, 2012*

**Trig.**

I'm trouble solving for theta. Any help is appreciated. 0.73377324 = sin(theta)/cos(theta)
*October 9, 2012*

**Chem**

Balance the following redox reactions in acidic solution by the half-reaction method Br–(aq) + I–(aq) + HClO(aq) = Br2(l) + IO3 + Cl–(aq)
*October 7, 2012*

**Physics**

A 1830-kg car is traveling with a speed of 19.8 m/s. What is the magnitude of the horizontal net force that is required to bring the car to a halt in a distance of 63.1 m? Not sure about the equation to use for this queation.
*October 7, 2012*

**Math**

what is the future value of $8000 a year for 28 years at 7.5%
*October 5, 2012*

**Calculus **

Find the absolute maximum and minimum vales of the set D. F(x,y) = x^2 + y^2 - 2x, D is the closed triangular region with vertices (2,0), (0,2), and (0,-2). I know that I have to find Fx(x,y) and Fy(x,y) but I'm not sure where to go from there. Any help is appreciated. Fx(...
*October 4, 2012*

**Computer Science**

Where can I find college grants and scholarships for men 2 deviations below standard in height?
*October 4, 2012*

**Algebra**

To keep his basketball team hydrated, Daniel mixes a powdered sports drink with cold water. For best taste the mix should be 96% water. If Danial has used 16 scoops of powder and added two quarts of water, how many gallons of water should he add, given than each scoop is 1/4 ...
*October 3, 2012*

**Trigonometry**

I need help on both of these... Find the exact value of cotx if the terminal side of angle x contains the point (-5,-12). Find the exact value of secx for angle x that has a terminal side containing the point (-1,squareroot3)
*October 2, 2012*

**Trigonometry**

Express 3 rad in degree measure and approximate to four significant digits
*October 2, 2012*

**physics**

A ball is thrown straight up with an initial speed of 30 m/s. How high does it go? Assume the acceleration of gravity is 10 m/s 2 . Answer in units of m
*October 1, 2012*

**Math**

if its linear, its a straight line. If its a quadratic, it looks like either a hill or a valley. It makes an arc. If its exponential, its a curve
*October 1, 2012*

**Calculus**

Never mind. I figured it out. L(x,y) = f(2,5) + fx(2,5)(x-2) + fy(2,5)(y-5) L(x,y) = 6 + 1(x-2) - 1(y-5) = 6+x-2-y+5 = x-y+9 L(2.2,4.9) = 2.2-4.9+9=6.3
*September 30, 2012*

**Calculus**

Given that f is a differentiable function with f(2,5) = 6, fx(2,5) = 1, and fy(2,5) = -1, use a linear approximation to estimate f(2.2,4.9). The answer is supposed to be 6.3. Here's what I've done so far: L(x,y) = f(2,5) + fx(2,5)(x) + fy(2,5)(y) L(x,y) = 6 + x - y L(2...
*September 30, 2012*

**Physics **

particle A moves along the line y = 30m with a constant velocity of magnitude 3.5 m/s and parallel to the x axis. At the instant particle A passes the y axis, particle B leaves the origin with 0 initial speed and constant acceleration of magnitude 0.50 m/s2. What angle θ ...
*September 30, 2012*

**Philosophy**

How might Hobbes argue that from the time of reformation (1517), with decline in the power of the pope, to WW1 no sufficient structure existed to support the Just War Theory?
*September 30, 2012*

**Quantum Physics**

They didn't say.. They just asked for the energy level that will emit a photon in an infrared region
*September 30, 2012*

**Quantum Physics**

An electron drop to what energy level is likely to emit a photon in the infrared region?
*September 30, 2012*

**physics**

two stones with initial speeds of 13 m/s and are thrown at an angle 30 degrees, one below the horizontal and one above the horizontal. What is the distance between the points where the stones strike the ground?
*September 29, 2012*

**physics**

two stones with initial speeds of 13 m/s and are thrown at an angle 30 degrees, one below the horizontal and one above the horizontal. What is the distance between the points where the stones strike the ground?
*September 29, 2012*

**physics**

two stones with initial speeds of 13 m/s and are thrown at an angle 30 degrees, one below the horizontal and one above the horizontal. What is the distance between the points where the stones strike the ground?
*September 29, 2012*

**understanding observation behavior**

Which of the following method depends on heavily on the observers memory.
*September 28, 2012*

**assessing development cognitive language observat**

There are several strategies that can help preschool children Foster language production one strategy that involves asking questions after a child. speaks to encourage him or her to continue talking is called?
*September 28, 2012*

**assessing development cognitive language observat**

When preschool child is first learning to print. alphabet letters he or she print letters upside down or backwards the teacher should.
*September 28, 2012*

**Physics**

A woman driving at a speed of 23 m/s sees a deer on the road ahead and applies the brakes when she is 210 m from the deer. If the deer does not move and the car stops right before it hits the deer, what is the acceleration provided by the car's brakes?
*September 26, 2012*

**math**

is 25 the answer?
*September 26, 2012*

**math**

please answer my question i really need help
*September 26, 2012*

**math**

So i should do 30/6=5 5*5=25
*September 26, 2012*

**math**

30 30 30 30 okay now what?
*September 26, 2012*

**math**

cause i need five squares to cover a aquare with a side length of 30 inches without over lappigng but i am really confused
*September 26, 2012*

**math**

i did 30 divided by 5 and i got six
*September 26, 2012*

**math**

how many squares with sides that are 6 inches long and needed to cover a aquare with a side length of 30 inches without over lappigng i put 1 am i correct?
*September 26, 2012*

**math**

no because 548 rounded to the nearest 10 is 550, this 550-130 is 420
*September 25, 2012*

**hands on variables**

n+2x10 when n=5
*September 25, 2012*

**math**

how many boxes can 372 be equally divided into?
*September 25, 2012*

**mathematics **

given that (the square root)1,225 = 35, evauluate 250(to second power)
*September 25, 2012*

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