# Posts by MAry

Total # Posts: 3,814

**Math**

The dividend is 5600. The divisor and the quotient have a difference of 10. Write the division sentence

**phi 103**

false

**algebra**

It took a contractor 1285 hours to manufacture their first unit of an item. If the contractor expects to acheive a 92% unit learning curve, how many hours would be required to manufacture units 51-100/

**history**

by 1910, why had public-school enrollment reach a record high a. increased funding for scholarships b. improved conditions in the school c. higher family incomes d. passage of laws requiring attendance

**Trigonometry**

Do I have to solve the right side of the equation first or bring it over to the left side?

**Trigonometry**

Fine the complete exact value of sin x = -sqrt3/2. I'm very lost as to how to even begin this problem.

**computers**

powerpoint presentation assignment how will i explore the role that family and society play in the development of the individual's sense of self.

**History**

The roots of the Iranian hostage crisis resided in: 1. Jimmy Carter’s emphasis on human rights. 2.the Shah of Iran’s despotic regime. 3.economic inflation in the United States. 4. America’s isolationist stance in foreign affairs. I think it's either 3 or 4??

**Statics**

A solid, round simply supported steel shaft has a diameter of 25mm and span length of 500mm. The shaft supports a concentrated load of 3kN at midspan. Calculate the maximum deflection of the shaft.

**Statics**

An aluminum wire has a diameter of d in. Determine the minimum diameter D of the coil in which the wire can be wound without exceeding a bending stress of 30,000psi

**Algebra 2**

The angular speed of a larger pulley wheel (radius=15cm) is 50 rev./min. Find the angular speed of the smaller wheel (radius=6cm).

**geometry**

the volume of a cylinder is 88 m. If the radius of the cylinder is quadrupled, what will be the volume of the new cylinder in cubic meters?

**Chemistry**

ÄH is enthalpy

**Chemistry**

What is the ÄH of CF4 (carbon tetraflouride)? What is the ÄH of HF (hydrogen flouride)? Lastly, what is the ÄH of C2H4 (ethane gas)? Please help.

**probability**

48

**probability**

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

**statistics**

yes thank you

**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

**Math**

The answer is some number

**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).

**math**

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

**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 ...

**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...

**Physics**

Thank you so much, Elena!

**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 ...

**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...

**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...

**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.

**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?

**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

**Math**

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

**Math**

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

**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.

**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?

**Chemistry**

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

**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

**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

**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?

**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

**biology 2 ap**

b. transfer energy with ATP

**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

**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

**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?

**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 ...

**Chemistry help please**

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

**Chemistry help please**

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

**Chemistry Help Please**

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

**Chemistry**

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

**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

**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.

**Algebra 2**

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

**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 ...

**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 ...

**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 ...

**Math**

28,487.32 is the answer, Sorry.

**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 ...

**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 ...

**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 ...

**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.

**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 ...

**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...

**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 :)

**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...

**calculus-derivatives**

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

**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? ...

**calculus-derivatives**

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

**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/...

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

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

**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 ...

**math**

Wouldnt the answer be 750....

**1st grade same sound**

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

**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 ...

**math**

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

**Anthropology**

Ethnographic methods are to ethnological methods as

**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...

**calculus: related rates**

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

**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 ...

**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 ...

**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 ...

**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.

**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...

**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.

**Algebra**

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

**algebra**

factor completely 4s^2-25

**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?

**social studies**

it will show u in gooogle

**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).

**statistics**

.0392

**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 ...

**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

**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.

**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

**Algebra**

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

**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 ...

**algebra**

Thank you so much

**algebra**

Is the answer First page 48 second page 49

**algebra**

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

**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__________

**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

**biology**

Recruitment of b cells