# Posts by help

Total # Posts: 1,477

**chemistry**

molecules of two different compounds contain the same number of atoms of each element but have different arrangement of atoms. which term correctly describes these two substances? a) isomers b) isotopes c) polymers d) none of the above

**chemistry**

molecules of two different compounds contain the same number of atoms of each element but have different arrangement of atoms. which term correctly describes these two substances? a) isomers b) isotopes c) polymers d) none of the above

**chemistry**

the elements of group VII A form ions with a charge of: A) +1 b) -1 c) -2 d) +2 can u please explain too? thankyou

**physics**

what are convex lenses?

**writing**

Which of the following does not belong in a conclusion paragraph? A. An attention grabbing sentence. B. A restated thesis sentence. C. A conclusion sentence. D. A summary of supporting details

**stats**

What does a p value p>0.05 mean? does it mean significant or insignificant? also, what does significant and insignificant mean?

**Math 1**

In audition for school play, 70% passed the quality of the jurors for the first week. of those remaining, 20% were chosen. if only 7 were qualified, how many tried their luck?

**math**

Please note, this is one section of the problem. I didn't feel the need to post the entire question as I understand how to do it...minus this one part. (2 tan pi/3) apparently becomes 2 sqrt 3.....explain?

**Statistics**

A local fire station receives an average of 0.5 rescue calls per day. Find the probability that on a randomly selected day, the fire station will receive fewer than two calls.

**Reading**

when you are purchasing auto insurance, your agem sex and marital status are considered together as your. A. claims history B. ratung territory C. driving record D. Driver classification I got B but it was WRONG

**calculus**

Can some explain how to do this problem? I tried using derivatives...but...I keep getting a different answer from what my teacher told me! A projectile is fired directly upward with an initial velocity of 144 ft/sec and its height (in feet) above the ground after t seconds is ...

**math**

A men's shoe store uses a markup rate of 115% on its most popular brands of shoes. If the shoe store buys a pair of popular-brand shoes for a wholesale price of $79, what will be the retail price of the shoes, to the nearest cent?

**calculus**

Andddd I just realized to take out the 3 out the 6 and 9 T_T opps. Thanks, now I feel dumb XD

**calculus**

I took out the 3x which gave me 3x(x+6-9) but if that's wrong...it's wrong :) thanks for the help!

**calculus**

hey I just wanted to make sure that I was doing this problem correctly. The question says to graph the function f given by f(x)=x^3+3x^2-9x-13 and find the local extremer. So here's what I did: f(x)=x^3+3x^2-9x-13 F^1(x)=3x^2+6x-9 = 3x(x-3) x=0 x=3 I put those two xes back...

**Algebra 1**

awesome.. I wasn't sure about the negative sign..:)

**Algebra 1**

can a base be negative at the same time as my exponent? how will you solve this one? -6 ^-3

**Chemistry**

Tube worms that survive near geothermal vents of hydrogen sulfide rely on bacteria living inside them to obtain energy by the oxidation of H2S to SO4^2-. What is the overall change in the oxidation number of sulfur for this reaction?

**Algrebra 1**

awesome thank you so much...! :)

**Algebra**

yes thank you!

**Algebra**

how to tell the difference between a negative number raised to a power and the opposite of a positive number raised to a power. Use examples in your explanation.

**Essay**

The supporting details

**math**

1-1/square root 3

**math**

I don't understand this question. I am suppose to be simplifying this: u^4-1/u^3-1 I put (u^2+1) (u+1)(u-1) for the top but the bottom, I can't figure out why my book put (u^2+u+1)(u-1) when it's only u^3...where did the extra u come from?

**statistics**

Which hypothesis-testing procedure would you use in the following situations? • The mean time an American family lives in a particular single-family dwelling is 11.8 years. A sample of 100 families in the Sycamore, OK area shows the mean time living in a single family ...

**Calculus**

factor fully: x^3 + x^2 - 7x + 2 give n that x=2 is a root

**Politics**

In Gandhi's account, the person practicing civil disobedience: Openly and civilly breaks an unjust law and quietly suffers the resulting penalty. Must refuse compliance with all of that society's laws for the sake of consistency. Is justified in retaliating against the...

**child development**

I understand...This lesson is just kicking my butt

**child development**

Oh okay sorry I just found this side and it is the first time using it but thanks for your help

**child development**

When both parents believe that men are capable of nurturing infants a. mothers devote time to caregiving b. fathers devote less time to caregiving c. fathers devote more time to caregiving d. the marital relationship tends to suffer, particulary when me spend little time in ...

**math**

what is the derivative of y=ln(x/4)

**Identifying a Fallacies**

I can't seem to figure out which fallcy this would be, is anyone familiar and could tell me which one for the following statement? 'To parents who think it's a good idea to share parenting, I say, "OK then, let the child stay in the house and you two swap ...

**Critical Thinking**

What kind of rhectorical or fallaci is this statement When religious conservatives enact laws to enforce the idea that their God abhors suicide, they threaten the central principle on which America was founded

**URGENT Spanish help please.**

thank you!

**URGENT Spanish help please.**

ok in the example it shows: ¿Comprendes espanol? Si, lo comprende ok for this question it's asking 1) do you and your siblings practice tennis my response: no, no los practicamos.. it said i was wrong how would I correct that 2) it asked does your mother teach ...

**Trig**

Solve the equation 2sin(2x) = cos x. and Solve the equation cos^2(2x)–sin^2(2x)= (√3 / 2).

**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)

**trig**

prove: cot^2(x)=cos(x)/(sinx)(tanx)

**Derivatives**

differentiate and simplify y= (e^x - 1) / x^2

**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^...

**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^...

**American Literature**

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

**trig**

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

**Trig**

4sin^(2)x-3=0

**physics**

I got frequency: 2pi/√ 2 Period: √2/2pi

**physics**

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

**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...

**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

**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

**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: ??? ...

**physics**

How do I find omega (ω)?

**physics**

Would I use cosine or sine?

**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: ??? ...

**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?

**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..

**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?

**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 ...

**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.

**American Literature**

Hey! Can anyone give a good suggestion on a research topic.

**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.

**Calculus**

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

**help!**

Are ways to prevent oil leakage in Kalamazoo?

**MsSue Please**

well it's a speech not writing

**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 ...

**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 ...

**Math ?**

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

**Math ?**

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

**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

**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 = __________

**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.

**American Literature**

Explain the meaning of one example of Cather's use of animals to describe human behavior.

**American Literature**

What is significant about the novel's title, My Antonia?

**voc 8**

is it teacher

**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

**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 ...

**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

**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 ...

**Persuasive topics.**

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

**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...

**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.

**math**

Complete the table for this question y=-1/2x+3 the table is x y 0 -2 -4 2 0

**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 ...

**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?

**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"?

**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 ...

**Chemistry**

I got it, thanks!

**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/...

**Calculus**

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

**Calculus**

Thank you!

**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?

**American Literature**

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

**American Literature**

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

**American Literature**

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

**Politics**

no, i think it is false

**Politics**

true

**Politics**

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

**Politics**

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

**math**

thanks guys!

**math**

solve for x: -3x^2+6x-3=0