Sunday

June 26, 2016
Total # Posts: 1,239

**Trig**

Use the half-angle formulas to come up with an exact expression for each function value below. You do not have to simplify your answers. cos(pi/16)
*April 1, 2012*

**trig**

prove: cot^2(x)=cos(x)/(sinx)(tanx)
*March 26, 2012*

**Derivatives**

differentiate and simplify y= (e^x - 1) / x^2
*March 25, 2012*

**math**

I have solved the following questions, let me know if they are correct, thanks. 1. Simplify, and write in the base of 3: (9^x . 3^4x)^2 answer: 3^12x 2. Differentiate and simplify a. y= 3x^4 - 4e^x + 8 answer: 4(3x^3 - e^x) b. y= (3 + 4e^x)^5 answer: 20e^x (3+ 4ex)^4 c. y= (e^...
*March 24, 2012*

**math-check**

I have solved the following questions, let me know if they are correct, thanks. 1. Simplify, and write in the base of 3: (9^x . 3^4x)^2 answer: 3^12x 2. Differentiate and simplify a. y= 3x^4 - 4e^x + 8 answer: 4(3x^3 - e^x) b. y= (3 + 4e^x)^5 answer: 20e^x (3+ 4ex)^4 c. y= (e^...
*March 24, 2012*

**American Literature**

Describe the political role of the poetry of the 1950s? can anyone give a few pointers on this, thanks!
*March 24, 2012*

**trig**

Solve for theta, giving a general formula for all of the solution: tan(theta)=-1 sin(theta/2)=1/2
*March 22, 2012*

**Trig**

4sin^(2)x-3=0
*March 21, 2012*

**physics**

I got frequency: 2pi/√ 2 Period: √2/2pi
*March 21, 2012*

**physics**

What is the period and frequency of a 10-pound weight oscillating (as a pendulum) on a 5-meter-long rope?
*March 21, 2012*

**physics**

consider the following: A point on the tip of a tuning fork vibrates in harmonic motion described by the equation d=10sin(ωt). 1. ω for a tuning fork that has a frequency of 535 vibrations per second. (I don't understand this question) 2. How many cycles does the...
*March 21, 2012*

**trig**

Determine the least positive value of t for which d=0. d=cos((3pi/4)(t)) 0=cos((3pi/4)(t)) I got stuck on this step Please help
*March 21, 2012*

**trig**

Determine the least positive value of t for which d=0. d=cos((3pi/4)(t)) 0=cos((3pi/4)(t)) I got stuck on this step Please help
*March 21, 2012*

**physics**

A buoy oscillates in simple harmonic motion according to the motion of waves at sea. An observer notes that the buoy moves a total of 6 feet from its lowest point to its highest point. The buoy returns to its highest point every 15 seconds. Amplitude: 6 feet Period: ??? ...
*March 21, 2012*

**physics**

How do I find omega (ω)?
*March 21, 2012*

**physics**

Would I use cosine or sine?
*March 21, 2012*

**physics**

A buoy oscillates in simple harmonic motion according to the motion of waves at sea. An observer notes that the buoy moves a total of 6 feet from its lowest point to its highest point. The buoy returns to its highest point every 15 seconds. Amplitude: 6 feet Period: ??? ...
*March 21, 2012*

**chemisrty**

The molar heat capacity of silver is 25.35j/mol C . How much energy would it take to raise the temperature of 9.30 grams of silver by 12.0 C?
*March 20, 2012*

**chemistry**

when I work this out I get 5.7 g but it is saying that my answer is incorrect and I am not sure what I am doing wrong..
*March 19, 2012*

**chemistry**

A 32.2 g iron rod, initially at 22.3 C, is submerged into an unknown mass of water at 63.9 C, in an insulated container. The final temperature of the mixture upon reaching thermal equilibrium is 58.6 C. What is the mass of the water?
*March 19, 2012*

**physics!!!**

The index of refraction for crown glass is 1.512 at a wavelength of 660 nm (red), whereas its index of refraction is 1.530 at a wavelength of 410 nm (violet). If both wavelengths are incident on a slab of crown glass at the same angle of incidence, 1.1°, what is the angle ...
*March 19, 2012*

**Ms.Sue**

MsSue can you give me a general analysis of what Kalamazoo Poverty Reduction Initiative is about and how they're beneficial. I've read the site and not comprehending it.
*March 18, 2012*

**American Literature**

Hey! Can anyone give a good suggestion on a research topic.
*March 16, 2012*

**Ms.Sue**

I've changed my persuasive topic from Water cons. to Poverty in Kalamazoo. Do you know of any organizations that help the poverty in Kalamazoo? So far I've only found Loaves and Fishes.
*March 16, 2012*

**Calculus**

Q. Find the minimum value of Q=x^2y subject to the constraint 2x^2+4xy=294. Its the derivative method.
*March 15, 2012*

**help!**

Are ways to prevent oil leakage in Kalamazoo?
*March 12, 2012*

**MsSue Please**

well it's a speech not writing
*March 12, 2012*

**MsSue Please**

I'm the guy doing the persuasive speak on the Oil leakage in the Kalamazoo river. I can see you're from/know of this area. Can you give me some pointers/idea's of what I could talk about/include in my persuasive speech. I've been doing a little reading of how ...
*March 12, 2012*

**calculus**

The efficiency of an internal combustion engine is given by E= (1-v/V)^0.4 Where V and v are the respective maximum and minimum volumes of air in each cylinder. a) Show that ∂E/ ∂V > 0 and interpret your result b) Show that ∂E/ ∂v < 0 and ...
*March 11, 2012*

**Math ?**

If p is a positive integer and is greater than 3. How many prime integers are there in 3p including 1 and 3p
*March 10, 2012*

**Math ?**

If p is a positive integer and is greater than 3. How many prime integers are there in 3p including 1 and 3p
*March 10, 2012*

**MsSue**

you helped me last week on finding a persuasive topic for on issues of Kalamazoo. I chose Water Conservation.. Do you know any handy news articles that would be of help that are 2009 and greater? Thanks In Advance
*March 9, 2012*

**geometry**

h = 16, k = 4, a = 4.) k = 3, a = 9, h = __________ 5.) a = , h = 5, k = ___________ 6.) h = 4, k = 1, n = ___________ 7.) h = 9, k = 6, m = ___________ 8.) n = , h = 5, p = ____________, k = __________
*March 9, 2012*

**American Literature**

Would you describe Langston Hughes’s poetry as modernist in its themes, use of images, and style? Refer to specific examples from Hughes’s poetry to support your answer.
*March 8, 2012*

**American Literature**

Explain the meaning of one example of Cather's use of animals to describe human behavior.
*March 7, 2012*

**American Literature**

What is significant about the novel's title, My Antonia?
*March 7, 2012*

**voc 8**

is it teacher
*March 7, 2012*

**Geometry**

isaac is landscaping a yard , to see how well a tree shades are area of the yard. He needs to know the trees height . The trees shadow is 18 feet long at the same time isaacs shadow is 4 feet long if isaacs is 6 feet tall how tall is the tree
*March 6, 2012*

**Trig**

Please help. I can't get this problem at all. When two bubbles cling together in midair their common surface is part of a sphere whose center D lies on the line passing through the centers of the bubble. Also, angles ACB and ACD are 60 degrees. Show that the radius r of ...
*March 5, 2012*

**math**

Suppose the space needle in seattle washington casts a 220 ft shadow at the same time a nearby tourist cast a 2- foot shadow if the tourist is 5.5 feet tall how tall is the space needle
*March 5, 2012*

**Calculus**

A sporting goods store sells 100 pool tables per year. It costs $20 to store one pool table for a year, based on the average inventory on hand. It costs $40 for each delivery of pool tables. How many times per year and in what lot size should the store order pool tables to ...
*March 4, 2012*

**Persuasive topics.**

What are some issues in Kalamazoo, Michigan that I can do a persuasive speech on. Issues that are 2010 or greater?
*February 28, 2012*

**Physics!!!**

A 24-V battery is connected in series with a resistor and an inductor, with R = 5.6 Ω and L = 2.0 H, respectively. (a) Find the energy stored in the inductor when the current reaches its maximum value. (b) Find the energy stored in the inductor one time constant after the...
*February 27, 2012*

**Chemistry**

A solution is prepared by adding 50ml of .05 M HCl to 150 ml of .10 M HNO3. Calculate the concentrations of all species in this solution.
*February 27, 2012*

**math **

Complete the table for this question y=-1/2x+3 the table is x y 0 -2 -4 2 0
*February 27, 2012*

**PHYSÝCS**

At the end of the spring term, a high school physics class celebrates by shooting a bundle of exam papers into the town landfill with a homemade catapult. They aim for a point that is 31.1 m away and at the same height from which the catapult releases the bundle. The initial ...
*February 27, 2012*

**physics**

A uniform ladder 10.0 m long is leaning against a frictionless wall at an angle of 60.0° above the horizontal. The weight of the ladder is 18.4 lb. A 60.8-lb boy climbs 4.18 m up the ladder. What is the magnitude of the frictional force exerted on the ladder by the floor?
*February 27, 2012*

**American Literature**

According to Langston Hughes in "The Negro Artist and the Racial Mountain, what is the "mountain standing in the way of any true Negro art in America"?
*February 25, 2012*

**physics!!!**

To monitor the breathing of a hospital patient, a thin belt is girded around the patient's chest . The belt is a 215-turn coil. When the patient inhales, the area encircled by the coil increases by 41.0 cm2. The magnitude of Earth's magnetic field is 50.0 µT and ...
*February 25, 2012*

**Chemistry**

I got it, thanks!
*February 23, 2012*

**Chemistry**

An atmospheric scientist interested in how NO is converted into NO2 in urban atmospheres carries out two experiments to measure the rate of this reaction. The data are tabulated below. A: [NO]0 = 9.63 × 10-3 M, [O2]0 = 4.1 × 10-4 M t(s) 0/3.0/6.0/9.0/12.0 [O2] 4.1/...
*February 23, 2012*

**Calculus **

Find an equation (in terms of x and y) of the tangent line to the curve r=3sin(5theta) at theta=pi/3
*February 21, 2012*

**Calculus**

Thank you!
*February 20, 2012*

**Calculus**

Sand is poured onto a level piece of ground at the rate of 0.25 m^3/min and forms a conical pile whose height is equal to its base diameter. How fast is the height increasing at the instant when the height is 0.50 m? V = 1/3(pi)(r^2)h I got 3/pie, is that correct?
*February 20, 2012*

**American Literature**

Based on "To Whistler, American," how does Pound view the role of American art and literature?
*February 18, 2012*

**American Literature**

least published, like whose work wasn't published that much, or didn't write that much compared to the others.
*February 18, 2012*

**American Literature**

Of Fitzgerald, Hemingway, Pound, and Stein, who was the least published writer? I have no clue about it
*February 18, 2012*

**Politics**

no, i think it is false
*February 17, 2012*

**Politics**

true
*February 17, 2012*

**Politics**

At the national level, America is best described as having a direct democracy system of government. True or false
*February 17, 2012*

**Politics**

Q. The words “wall of separation between church and state” appear in the Constitution. a. true b. false
*February 17, 2012*

**math**

thanks guys!
*February 16, 2012*

**math**

solve for x: -3x^2+6x-3=0
*February 16, 2012*

**Algebra 2**

log100^x
*February 6, 2012*

**PreCalculas**

Can someone tell me what the graph of r=cos (5/2 x angle) should look like?
*February 2, 2012*

**physics!!!**

Two capacitors, C1 = 27.0 µF and C2 = 35.0 µF, are connected in series, and a 21.0 V battery is connected across them. (a) Find the equivalent capacitance, and the energy contained in this equivalent capacitor. equivalent capacitance= µF total energy stored...
*January 27, 2012*

**math**

Kelly opened a savings account with $500 she received at 8th grade graduation four years ago. The account pays 2.5 percent compounded daily. How much should be in the account now?
*January 25, 2012*

**math**

How much money would you have in a savings account at the end of one year, if you saved $1000 at two percent interest compounded quarterly? Round to the nearest dollar
*January 25, 2012*

**math**

Michelle put $2000 in a savings account at 1.75 percent interest. She kept it there for eight years. How much interest did she earn?
*January 25, 2012*

**math**

Orlando has a bank statement balance of $414.25 and $5.90 service charge. His check register shows $374.16 and he has two outstanding checks of $26.54 and $21.78. What is his true balance?
*January 25, 2012*

**Chemistry**

This is what I did: moles of H2O = 3.88 delta H rxn = -2044.02 (3.88 moles)(6.01 kJ/mol) = 23.359 kJ (3.88 moles)(75.291 J/mol/C) = 29.263 kJ 23.359kJ + 29.2636 kJ = 29.286 kJ (44 g of C3H8)(29.286kJ/-2044.02kJ) = 0.6304 g But I think I did something wrong??
*January 24, 2012*

**Chemistry**

How many grams of propane must be burned to provide the heat needed to melt a 70.0-g piece of ice...? How many grams of propane must be burned to provide the heat needed to melt a 70.0-g piece of ice (at its melting point) and bring the resulting water to a boil (with no ...
*January 24, 2012*

**Chemistry**

Thanks
*January 23, 2012*

**Chemistry**

Knowing that delta Hvap for water is 40.7 kJ/mol, calculate Pvap of water at 46 C
*January 23, 2012*

**math**

Bart had an income of $38,250 last year. If the inflation rate is 4.5%, what is his purchasing power?
*January 23, 2012*

**math**

If your annual income from a part-time job is $4523, and the inflation rate is 6 percent, what is the purchasing power of your income?
*January 23, 2012*

**math**

Let C = 2.32 N + 34180 represent the cost (C) of raising a child to 18 years of age, on an income (N). If the cost is $120,000, what is the income?(
*January 23, 2012*

**math**

You spend $685 a month on living expenses. If your monthly income is $1500, what percent of your income do you spend on living expenses?
*January 23, 2012*

**math**

Una makes $64 a week, plus 15 percent of the cost of meals that she serves. Use the equation, y = 0.15x + 64, to predict what she makes in a week when she serves $355 worth of meals
*January 23, 2012*

**civics**

@writeacher ...i'm still confused.
*January 21, 2012*

**civics**

Which is NOT a responsibility of the Department of Agriculture? 1. The opening of foreign markets to U.S. agricultural products 2. To oversee federal anti-hunger programs 3. The designation of lands for private and public use =4. Support for farmers with agricultural research
*January 21, 2012*

**Civics**

Which is NOT a responsibility of the Department of Agriculture? 1. The opening of foreign markets to U.S. agricultural products 2. To oversee federal anti-hunger programs =3. The designation of lands for private and public use 4. Support for farmers with agricultural research
*January 21, 2012*

**Physics!!!**

The electric field everywhere on the surface of a charged sphere of radius 0.260 m has a magnitude of 545 N/C and points radially outward from the center of the sphere. (a) What is the net charge on the sphere?
*January 20, 2012*

**Physics!!!**

The electric field everywhere on the surface of a charged sphere of radius 0.260 m has a magnitude of 545 N/C and points radially outward from the center of the sphere. (a) What is the net charge on the sphere?
*January 20, 2012*

**Math**

If your annual income from a part-time job is $2,698, and the inflation rate is 4 percent, what is the purchasing power of your income?
*January 19, 2012*

**MAth**

Dan bought a home theater system for $178.99 on the installment plan. The terms of the contract said that he would pay $35 a month for six months. How much are his total payments?
*January 18, 2012*

**Algebra 1**

Please help me find the answer to this problem. it would be nice to have the details to how you came by the answer: Radical of 3/4 + radical of 1/3 your help is greatly appreciated
*January 6, 2012*

**chem**

you need to make .80 M solution of NiSO4 (aq). How many grams of NiSO4 * 6H2O should you put into a .50 L volumetric flask?
*December 12, 2011*

**Physics**

The moment of inertia of an asteroid rotating about its own axis is 5.00 ! 10 4 kg"m2. Its angular velocity is 40.0 rad/s. If a force acts on the asteroid for 0.100 s, increasing the angular velocity to 48.0 rad/s, find its magnitude
*December 9, 2011*

**Physics**

A 6110-kg bus traveling at 20.0 m/s can be stopped in 24.0 s by gently applying the brakes. If the driver slams on the brakes, the bus stops in 3.90 s. What is the average force exerted on the bus in both these stops?
*December 9, 2011*

**Physics**

Analyze the collision of a baseball with a bat. During which portion of the collision does the baseball’s velocity reach zero? a. before the collision b. during the collision c. one second after the collision d. one-hundredth of a second after the collision
*December 9, 2011*

**Physics**

Which conditions will result in the smallest change in momentum? a. a large force over a long time period b. a large force over a short time period c. a small force over a long time period d. a small force over a short time period
*December 9, 2011*

**Physics**

A rocket leaves a launch pad at liftoff with a great deal of upward momentum. What was initially given downward momentum? a. the launch pad b. the astronauts aboard the rocket c. the expelled fuel d. the entire Earth
*December 9, 2011*

**Physics**

A 0.140-kg baseball is pitched horizontally at 36.7 m/s. When a player hits the ball, it moves at the same speed, but in the opposite direction. If the bat and the ball are in contact for 0.450 ms, calculate the average force the bat exerts on the ball.
*December 9, 2011*

**Physics**

Candona strikes a 0.055-kg golf ball with a force of 260 N. If the ball moves with a velocity of 65 m/s, calculate the time the ball is in contact with the club.
*December 9, 2011*

**Physics**

A rocket expels gases at a rate of 1.30 x 10^3 kg/s with a speed of 3.00 x 10^4 m/s. What is the force exerted on the rocket?
*December 9, 2011*

**Physics**

A lump of clay with a mass of 5.0 ! 10-2 kg is thrown toward a wall with a velocity of 3.0 m/s. The clay bounces off the wall with a velocity of #0.5 m/s. What is the impulse on the clay? If the clay in the previous problem impacted the wall for 5.0 ms, what was the average ...
*December 8, 2011*

**Calculus **

A 727 jet needs to attain a speed of 200 mph to take off. If it can accelerate from 0 to 200 mph in 30 seconds, how long must the runway be? (Assume constant acceleration)
*December 8, 2011*

**Physics**

A helium balloon lifts a basket and cargo of total weight 2250 N under standard conditions, at which the density of air is 1.29 kg/m3 and the density of helium is 0.178 kg/m3 . What is the minimum volume of the balloon? The acceleration of gravity is 9.81 m/s2 . Answer in ...
*December 5, 2011*

**chemistry**

A solution of sulfuric acid in water that is 25% H2SO4 by mass has a density of 1178 g/ml. Which expression gives the molarity of this solution?
*November 16, 2011*