# Posts by MAry

Total # Posts: 3,798

**probability**

of the 2598960 different 5 card hands possible from a deck of 52 playing cards, how many would contain all 4 tens?

*April 21, 2012*

**statistics**

yes thank you

*April 20, 2012*

**statistics**

Using the Chi-square test I am having problems when I get to the part of adding the the fractions and getting the percent that must be rounded to three decimal places. I have looked in the text and searched the internet. Can you please me

*April 20, 2012*

**Math**

The answer is some number

*April 16, 2012*

**physics**

a helicopter is ascending vertically with a speed of 5.20 m/s. at a height of 110 m above the Earth, a package is dropped from a window. how much time does it take for the package to reach the ground ? (hint: v0 for the package equals the speed of the helicopter).

*April 15, 2012*

**math**

Please explain in detail how to solve this problem: h = -16t^2 + 156t + 105

*April 14, 2012*

**math**

Please explain to work this: A rocket is launched from atop a 105-foot cliff with an initial velocity of 156ft/s. the height of the rocket above the ground at time t is given by h= -16t^2 + 156t + 105. When will the rocket hit the ground after it is launched? Round to the ...

*April 13, 2012*

**Stats**

A study of the students taking distance learning courses at a university finds that they are mostly older students not living in the university town. Choose a distance learning student at random. Let A be the event that the student is 25 years old or older and B the event that...

*April 10, 2012*

**Physics**

Thank you so much, Elena!

*April 9, 2012*

**Physics**

A large solid cylinder rolls without slipping down a 40 m long hill with a 30 degree slope. The cylinder then rolls a short distance over level ground and then off a 20 meter high sheer cliff. How far from the base of the cliff does the cylinder land? Ignore friction and air ...

*April 9, 2012*

**p**

A roller coater has a first drop of 140 meters and then enters a circular loop. Find the maximum radius of the loop such that the coaster never leaves the track at the top of the loop. Using the radius found in part 1, calculate the largest centripetal acceleration experienced...

*April 9, 2012*

**Physics**

A pool ball initially traveling 5 m/s strikes a second pool ball of identical mass in a totally elastic collision. After the collision the first ball has veered off its original path and is now traveling at 3 m/s. Find the speed and angle of each pool ball after the collision...

*April 9, 2012*

**Physics**

A bullet mass 10 g strikes a log with a mass of 25 g suspended from a 3 meter long string. The bullet lodges in the log which swings up through an angle of 30 degrees. Find the speed of the bullet just before it hit the log.

*April 9, 2012*

**algebra**

the population of a city is expected to triple every 25 years . when can the city planners expect the present population of 180 persons to double?

*April 4, 2012*

**government**

This one i am stuck between A and B i need help. Which correctly lists the three factors of production in a capitalist economy? A. land, labor, and a laissez-faire economy B. socialism, labor, and capital C. land, labor, and capital D. land, capital, and monopoly

*April 2, 2012*

**Math**

Find y^1 for the relation 2 sin (x^2y)-5x^3=3y^2. Please explain so I can work similar problems.

*April 2, 2012*

**Math**

Find the points at which the relation 3x^2-2xy+y^2=24 has a vertical or horizontal tangent line.

*April 2, 2012*

**Math**

Find two lines passing through (-1, 1)which are tangent to the ellipse x^2-4x+y^2+3=0. Please write out how to get there. Thank You.

*April 2, 2012*

**Chemistry help please**

i need some help understanding this problem please. How many moles of O are there in 32.4g N2O5, how many oxygen and nitrogen atoms are there in the 32.4g?

*March 31, 2012*

**Chemistry**

How many moles of O are there in 32.4g N2O5, how many oxygen and nitrogen atoms are there in the 32.4g?

*March 31, 2012*

**AP Science**

A 2 N and 6 N force pull on an object to the right and a 4 N force pulls to the left a 0.5 kg object. What is the net force on the object? Is the answer 4N to the right

*March 28, 2012*

**Science**

How do these rank in momentum 1 being least and the most 5 Fast car, stopped truck, slow car, Fast baseball, Fast feather I have 1. Stopped truck

*March 28, 2012*

**Science**

A 2 N and 6 N force pull on an object to the right and a 4 N force pulls to the left a 0.5 kg object. What is the net force on the object?

*March 28, 2012*

**science**

if a person is pushing a cart with a force of 40 newtons and it accelerates at 0.5 m/s2 what is the mass of the cart

*March 28, 2012*

**biology 2 ap**

b. transfer energy with ATP

*March 28, 2012*

**math**

what is the lateral surface area of a right hexagonal prism whose base is a regular hexagon with sides measuring 8 incheslong and altitude measuring 6 inches tall

*March 27, 2012*

**math**

find the lateral surface area of a right triangular prism if its altitude is five inches and its base is an isoceles right triangle with hypotenuse of length 10 inches

*March 27, 2012*

**Chemistry Help!!!**

I seriously don't understand this...i cant even begin to think of what to do please help... How many moles of Ba(OH)2 does it take to neutralize 2.5 moles of HNO3?

*March 26, 2012*

**statistics**

(Quiz 240 ) Stratified Sampling: The owner of a private food store is concerned about employee morale. She decides to survey the mangers and hourly employees to see if she can learn about work environment and job satisfaction. From the list of workers at the store, obtain a ...

*March 26, 2012*

**Chemistry help please**

What is the pH of a solution whose hydronium ion concentration is 0.0010 M?

*March 26, 2012*

**Chemistry help please**

What is the pH of a solution whose hydronium ion concentration is 0.0010 M?

*March 26, 2012*

**Chemistry Help Please**

What is the OH- concentration of a solution that has a pH of 9.66?

*March 26, 2012*

**Chemistry**

never mind u have already responded thanks I was right the first time.

*March 25, 2012*

**Chemistry**

DrBob22 please help with the pH. I am not sure if I would use pKa=-logKa=-log(1.9*^-5)=4.74 or do I use [H3O]= 10^-pH =.0040=10*^-ph

*March 25, 2012*

**Chemistry**

I too am trying to understand. So far I have figured this but do not know if correct. Acidity constant=Ka=[A^-][H3O]/[HA] A^-= [CH3OO^-]=0.0040M [H3O]=0.0040 [HA]=0.8537 So plug them in and you get 1.8*10^-5 im lost at the pH value help with that please.

*March 25, 2012*

**Algebra 2**

The concentration of hydrogen ions in a batch of homemade ketchup is 10-4,. What is the pH level of the ketchup?

*March 25, 2012*

**history**

During a remarkable period of change from roughly 1865 to the early 20th century, the great cities that we know and love today expanded at an incredibly rapid pace and went through a fundamental transformation in composition and construction. Select one of the ways that the ...

*March 24, 2012*

**College Physic**

2) A car traveling with 5 m/s encounters a deer. The drivers slams on the breaks, the breaks lock. The car skids to a complete stop on the road ahead (and the deer runs away). Why does the car stop (where does all the kinetic energy it had go)? Find the magnitude of the ...

*March 23, 2012*

**double integrals**

Combine the following two integrals into one by sketching the region, then switching the order of integration. (sketch the region) im gonna use the S for integral sign..lol SS6ycos(x^3-3x)dxdy+SS6ycos(x^3-3x) And the first integration limits for x are between -1 and y, for y ...

*March 21, 2012*

**Math**

28,487.32 is the answer, Sorry.

*March 20, 2012*

**Math**

The McKeegan Corporation has two different bonds currently outstanding. Bond M has a face value of $29,500 and matures in 24 years. The bond makes no payments for the first 7 years, then pays $2,100 every six months over the subsequent 10 years, and finally pays $2,700 every ...

*March 20, 2012*

**History**

￼￼￼￼All of the following statements about Jaoan in the last year of the war are true except: A. Japanese retreated from Okinawa B. Fire bombs crippled Japanese economy and war production C.Japanese treated Postdam Decleration with disintrest. I ...

*March 20, 2012*

**Math**

Consider a game where Ann and Bob play against each other in a dice game, Ann wins if her score is higher than Bob's, Bob wins if his score is higher or if the scores are the same. What is the probability of Ann winning? I calculated and got 1 - summation from 1 to 6 of n ...

*March 18, 2012*

**accounting**

Discuss in 200 to 300 words, each of the four financial statements. Explain the different components of the statements as well as what the statements tell about a business.

*March 16, 2012*

**Basic Calculus-Optimization Problems**

Hello, please help me. There is a question where I have to optimize the area of a field that is being fence in like this: [|] i.e. two rectangle fields, side by side: area= 2x by y. I get to use 200ft of fencing. From that diagram and the amount of fencing I have, I made this ...

*March 16, 2012*

**Basic Calculus-Relative Extrema**

Hello, please help me :) A question asked that I find all relative extrema of a function f(x)= x + 1/x. I'm a bit confused with my solution, but I'll show my work first..: I found f'(x) to get the critical numbers: f'(x)=1-x^-2 f'(x)=(x^2 -1)/x^2 f'(x...

*March 15, 2012*

**calculus-domain**

:O This graphing device is much better! I was using an application made by google chrome x). Thank you so much, I'll use this from now on :)

*March 15, 2012*

**calculus-domain**

Hello, I would greatly appreciate your input. I just need some reassurance that I'm going about this question the right way. I am to find out where h(x)=x*(x-1)^(1/3)is increasing and decreasing. so after I did some solving I found my critical points to be x=(3/4) and x=1...

*March 15, 2012*

**calculus-derivatives**

Oooooh! Thank you two so much :) I'm more confident in regards to my test now, thank you

*March 15, 2012*

**calculus-derivatives**

Hello, please help me. I needed to find the derivative of f(x)= x^4 -2x^3 + x +1. I got f'(x)= 4x^3 -6x^2 +1. I would like to figure out the critical numbers so I can figure out where it increases and decreases, but I have no idea how to factor it... Is it even possible? ...

*March 15, 2012*

**calculus-derivatives**

:D I'm so happy! Never thought to factor that out x) thank you!

*March 15, 2012*

**calculus-derivatives**

Hello, please help me, I'm studying for a test. :) I won't say the question because I'd like to figure it out myself or try first, but I'm looking for a simpler way to go about this. I have to find the derivative of h(x)= (x)(x-1)^1/3 I got: h'(x)= (x-1)^1/...

*March 15, 2012*

**Algebra! 20 yrs. out of school**

a. 1/2 times 1/3 b. 3/4 times 1/3

*March 14, 2012*

**Accounting**

Much of accounting is directed at servicing the information needs of those users that are external to an organization. Identify at least three external users of accounting information and indicate two questions they might seek to answer through their use of accounting ...

*March 13, 2012*

**math**

Wouldnt the answer be 750....

*March 13, 2012*

**1st grade same sound**

which one of the 3 words has the same sound as boat? sol slow do

*March 12, 2012*

**anatomy**

I have 2 problems/questions I am unsure of the answers. The first one is "how would you demonstrate the Valsalve maneuver using the model lung?" and 2. If a woman is breathing rapidly and deeply after exercise, would TLC, RV, TV, IRV, and ERV stay the same, increase ...

*March 12, 2012*

**math**

is 2x - 5 = 5 = 7x = 3 a linear equation

*March 12, 2012*

**Anthropology**

Ethnographic methods are to ethnological methods as

*March 12, 2012*

**Biology Question**

I have 2 problems/questions I am unsure of the answers. The first one is "how would you demonstrate the Valsalve maneuver using the model lung?" and 2. If a woman is breathing rapidly and deeply after exercise, would TLC, RV, TV, IRV, and ERV stay the same, increase...

*March 11, 2012*

**calculus: related rates**

:O Thank you so much, for some reason i totally forgot about the product rule! hahah... :)

*March 11, 2012*

**calculus: related rates**

hello, please help me. A cylindrical can is being heated with its height increasing at the rate of 0.01cm/min and its diameter at the rate of 0.005cm/min. At what rate is the volume increasing when the can has a diameter of 15cm and a height of 20cm. this is how i'm going ...

*March 11, 2012*

**A&P II**

I have 2 problems/questions I am unsure of the answers. The first one is "how would you demonstrate the Valsalve maneuver using the model lung?" and 2. If a woman is breathing rapidly and deeply after exercise, would TLC, RV, TV, IRV, and ERV stay the same, increase ...

*March 11, 2012*

**physics**

A small plane mass 600 kg lifts off from the runway at a speed of 145 Km/Kr. 2 Minutes later, the plane has reached an altitude of 300 meters and its airspeed has dropped to 90 Km/Hr. Assume the power output of the engine was constant during this time. Ignore air resistance ...

*March 10, 2012*

**Physics**

A mas of 100 Kg hangs from a cable secured to a steel pole and supported by another cable as shown below. Find the tension (T) in the support cable and the force (F) on the steel pole.

*March 10, 2012*

**Physics**

A mass sits at the top of a 2 meter long ramp inclined at an angle of 30 degrees (to the horizontal). When the mass is released, it slides down the ramp and then onto a level floor. If both the ramp and the board have a coefficient of .25 (Friction), how far out onto the floor...

*March 10, 2012*

**physics**

At a low point in its swing, a pendulum bob with a mass of 0.2kg has a velocity of 4m/s. Ignoring air resistance, how high will the bob swing above the low point before reversing direction? Please explain and show work.

*March 9, 2012*

**Algebra**

add (3c^4-2c^3+11c-9)+(c^5+7c^3+4c^2-3c+6)+(-6c^4+c^2-5c-5)

*March 8, 2012*

**algebra**

factor completely 4s^2-25

*March 8, 2012*

**geometry**

April wants to add a ribbon border to the circular rug in her living room. If the area of her rug is 113.04 square feet, how long does the ribbon need to be?

*March 7, 2012*

**social studies**

it will show u in gooogle

*March 7, 2012*

**statistics**

The average salary for graduates entering the actuarial field is $40,000. If the salaries are normally distributed with a standard deviation of $5000 (σ = 5000), find the probability that a graduate will have a salary over $45,000: P(X > 45,000).

*March 7, 2012*

**statistics**

.0392

*March 7, 2012*

**math**

Tiny is ordering a pizza and cant decide between a round pizza with a diameter of 4 inches or a rectangular pizza that is 12 inches by 14 inches. The round pizza is 9.50 and the rectangular pizza is 10.00. Which is larger? How much larger is it? Which pizza is the better buy ...

*March 7, 2012*

**Chemistry**

A solution is prepared by mixing 3.5 g of nitric acid with enough water to make 8.00 L of solution. Find the [H3O+], [OH-], pH and the pOH

*March 7, 2012*

**math**

From the pizza shop, James walks 12 blocks south, 22 blocks east, 18 blocks north, and 30 blocks west. What is the least number of blocks that he must travel if he returns to the pizza shop? Explain how you got your answer – draw a picture or write a sentence.

*March 6, 2012*

**math**

Bob made a square table top with 100 white square tiles. He painted the tiles along the edge of the table red. How many tiles are red? You must show your work

*March 6, 2012*

**Algebra**

give exact and approximate solutions to three decimal places. x^2+5x-7=0

*March 5, 2012*

**algebra**

A farmer decides to enclose a rectangular garden, using the side of a barn as one side of the rectangle. What is the maximum area that the farmer can enclose with 80 ft of fence? what should the dimensions of the garden be to give this area. The maximum area that the farmer ...

*March 5, 2012*

**algebra**

Thank you so much

*March 5, 2012*

**algebra**

Is the answer First page 48 second page 49

*March 5, 2012*

**algebra**

I am not sure how to figure this out...can you help a little more

*March 5, 2012*

**algebra**

A student opens a mathematics book to two facing pages. The product of the page number is 2352. Find the page numbers. The first page is__________ The secnd page is__________

*March 5, 2012*

**science**

which of the following is a physical change? Milk becomes sour An iron nails rusts All the water in a solution of salt water evaporates leaving a lot of crystals of salt in the bottom of the dish A wooden log is burned leaving ash in the fireplace

*March 5, 2012*

**biology**

Recruitment of b cells

*March 4, 2012*

**SUE PLEASE HELP**

its D

*March 4, 2012*

**Algebra 2**

What is the probability when you roll 2 dice and you roll a number greater than 4 on the first dice and a 2 on the second dice? pls help :)

*March 4, 2012*

**AP CHEMISTRY**

A buffer, consisting of H2PO4− and HPO42−, helps control the pH of physiological fluids. Many carbonated soft drinks also use this buffer system. What is the pH of a soft drink in which the major buffer ingredients are 7.20 g of NaH2PO4 and 4.90 g of Na2HPO4 per ...

*March 3, 2012*

**Chemistry**

Each of the following processes is spontaneous as described. Which one will have ∆H approximately equal to zero? 1. precipitating 1 mol of AgBr(s) from a solution of Ag+(aq) and Br−(aq) 2. 1 L He(1 atm, 298 K) + 1 L Ar(1 atm, 298 K) → 2 L He/Ar mixture(1 atm...

*March 1, 2012*

**5th grade Math**

Insert parentheses in the false number sentence to make it true. -3+5*2-(-6)=37

*February 29, 2012*

**Algebra 2**

if one class had 20 students participating in the taste test and each student's rating is represented as ak, how do you write the formula for finding the mean rating using summation notation?

*February 29, 2012*

**Math**

Adriano. two is prime as are all the other numbers in his pattern.... hong-li wrote 6 and 6 can be divided by 2 and 3 therefore not prime. Latrell wrote 9 and that can be divided by 3 so 9 is not prime.

*February 29, 2012*

**bio**

In 3 or more sentences describe the structure of a water molecule and its unique properties

*February 29, 2012*

**HIS/115**

Compare European settlements in New England, the Middle Colonies, the Chesapeake, and the South in terms of goals, governments, social structures, and religions. What similarities do you find most remarkable? What differences do you find interesting? Why?

*February 29, 2012*

**US HISTORY**

Why did prohibition take place in mostly rural areas.

*February 28, 2012*

**Math for Liberal Arts Major**

Find the solution set for the following inequality: x+1>1/2x-11

*February 27, 2012*

**maths**

Given that the equation of the parabola is 5y^2 + 24x = 0. Find (1)The Axis and vertex of the parabola (ii)The focus and the directrix (iii)The distance from the directrix to the focus

*February 27, 2012*

**KNOWLEDGE**

Indian movie that won oscar

*February 25, 2012*

**health**

patricia had a car crash while she was on her way to work one morning.she was badly injured and needed to have an arm amputated.explain three effects that patricias physical disability may have on her self-concept.patricias husband,andy is a teacher.explain three ways that ...

*February 25, 2012*

**social work**

What are some of the issues that need to be addressed in the hiring of competent staff in working with people with disabilities? I am only finding information about employing those with disabilities. How do I phrase this question to Google or ideas where to look?

*February 22, 2012*