Friday

October 21, 2016
Total # Posts: 104

**Expected Value**

Thanks

*October 6, 2016*

**Expected Value**

A bag contains 2 gold marbles, 7 silver marbles, and 23 black marbles. Someone offers to play this game: You randomly select one marble from the bag. If it is gold, you win $4. If it is silver, you win $2. If it is black, you lose $1. What is your expected value if you play ...

*October 6, 2016*

**Expected Value? Help**

For (a) I have 11.55 is this correct

*September 25, 2016*

**Expected Value? Help**

what?

*September 25, 2016*

**Expected Value? Help**

Kyd and North are playing a game. Kyd selects one card from a standard 52-card deck. If Kyd selects a face card (Jack, Queen, or King), North pays him $4. If Kyd selects any other type of card, he pays North $3. a) What is Kyd's expected value for this game? Round your ...

*September 25, 2016*

**Expected Value?**

iS IT 44.616

*September 25, 2016*

**Expected Value?**

A company estimates that 0.4% of their products will fail after the original warranty period but within 2 years of the purchase, with a replacement cost of $300. If they offer a 2 year extended warranty for $46, what is the company's expected value of each warranty sold?

*September 25, 2016*

**Expected Value**

A bag contains 1 gold marbles, 10 silver marbles, and 29 black marbles. Someone offers to play this game: You randomly select one marble from the bag. If it is gold, you win $4. If it is silver, you win $2. If it is black, you lose $1. What is your expected value if you play ...

*September 25, 2016*

**experimental psychology **

Given that on one section of the SAT the mean is 500 and the standard deviation is 100, what is the approximate probability of a student scoring 600 or higher on the test? Round as appropriate.

*March 16, 2016*

**chemistry**

The growth of Pseudomonas bacteria is modeled as a first-order process with K=0.035 min ^-1 at 37 degrees C. The initial Pseudomonas population density is 1.0 x 10^3 cells/L. Enter your answers in scientific notations. A) What is the population density after 4.0 h B) What is ...

*September 14, 2015*

**English**

Which of the following sentences contains an error in subject-verb agreement? a) Either Dennis or Susan is going to pick you up. B)Each of the 14 groups are going to contribute an item to the auction. C) Krisy, Molly, and Kate attend the same university and ride the bus ...

*August 24, 2015*

**Biology**

In humans, the allele for brown eyes is dominant to the allele for blue eyes. If a man with blue eyes and a woman with brown eyes who is homozygous for eye color have children, what is the probability of having a child with blue eyes? Here are the choices: 25 percent, 100 ...

*November 26, 2014*

**Pre-Algebra**

Is 16.6 a rational or irrational# ????

*August 27, 2014*

**Math**

Express the following in term of sum (or difference)of logarithms: log (10A)/(7B^2)

*August 2, 2014*

**social studies**

What doctrine of rights did both the "no incorporation" justices and the "plus incorporation" justices use to expand the notion of legal rights?

*February 12, 2014*

**college calculus**

thank you steve

*November 30, 2013*

**college calculus**

I don't know how to solve this indefinite integral with both limits as variables: ^x^3 ç (z^4+1)dz ⌄ln(x) If you could explain I'd appreciate it.

*November 30, 2013*

**English**

Neither the searing pain in my toe nor the blinding rain in my face will keep me from finishing the race. Is this a correct parallel sentence?....

*March 12, 2013*

**English**

The space shuttle was both a marvel and huge. Parallel Sentencce?....

*March 12, 2013*

**English**

Fire can be either friendly or a foe, depending on the situation. is this a correct paralell sentence

*March 12, 2013*

**English**

My sister Aliah is both a comic and smart. Parallel Sentence?....

*March 12, 2013*

**English**

According to some economists, neither high unemployment nor large deficits will keep the economy from rebounding. How to make this a parallel sentence?

*March 12, 2013*

**science**

observing

*January 8, 2013*

**subtraction (math)**

Your butt plus my bütt ID thesse nuts

*November 14, 2012*

**physics**

A baseball leaves a pitcher's hand horizontally at a speed of 115 km/h. The distance to the batter is 18.3 m. (Ignore the effect of air resistance.) (a) How long does the ball take to travel the first half of that distance? (b) The second half? (c) How far does the ball ...

*October 7, 2012*

**physics**

A cart is propelled over an xy plane with acceleration components ax = 5.1 m/s2 and ay = -2.9 m/s2. Its initial velocity has components v0x = 8.2 m/s and v0y = 11.2 m/s. In unit-vector notation, what is the velocity of the cart when it reaches its greatest y coordinate?

*October 7, 2012*

**physics**

A plane flies 475 km east from city A to city B in 50.0 min and then 986 km south from city B to city C in 1.00 h. For the total trip, what are the (a) magnitude (in km) and (b) direction of the plane's displacement, the (c) magnitude (in km/h) and (d) direction of its ...

*October 7, 2012*

**physics**

A train at a constant 68.0 km/h moves east for 41 min, then in a direction 65.0° east of due north for 22.0 min, and then west for 60.0 min. What are the (a) magnitude (in km/h) and (b) angle (relative to north, with east of north positive and west of north negative) of ...

*October 7, 2012*

**physics**

A train at a constant 68.0 km/h moves east for 41 min, then in a direction 65.0° east of due north for 22.0 min, and then west for 60.0 min. What are the (a) magnitude (in km/h) and (b) angle (relative to north, with east of north positive and west of north negative) of ...

*October 7, 2012*

**physics**

Some hydrogen gas is enclosed within a chamber being held at 200 whose volume is 0.0250 . Initially, the pressure in the gas is (14.8 ). The chamber is removed from the heat source and allowed to cool until the pressure in the gas falls to . At what temperature does this occur?

*September 9, 2012*

**chemistry**

I don't understand what you mean by dividing it into the required ratio. I understand where you got the ratio from, but do you mean 24.26/1.00 = for sodium and 24.26/1.54 = for chlorine?

*September 4, 2012*

**pre-algebra**

how long will it take to earn $568.75 in interest if $2500 is invested at a 6.5% annual interest rate

*March 23, 2012*

**conics**

given A(6,8) and B(-6,-8) write an equation in terms of x and y for all points P(x,y) such that segment PA is perpendicular to segment PB. simplify the equation and interpret your answer.

*March 23, 2012*

**conics**

given O(0,0) and N(12,0) write an equation in terms of x and y for all points P(x,y) such that segment PO is perpendicular to segment PN. simplify this equation and show that P is on a circle.

*March 22, 2012*

**math**

given O(0,0) and N(12,0) write an equation in terms of x and y for all points P(x,y) such that segment PO is perpendicular to segment PN. simplify this equation and show that P is on a circle.

*March 22, 2012*

**8th Grade Math**

a 12 in. by 14 in. rectagular cake is divided into 2 in. squares. If your piece is chosen at random, what is the probability that your piece is from the outside edge of the cake?

*December 8, 2011*

**pre-calculus**

solve cos 2x=secx for 0(<=)x<2pi using trigonometric identities.

*October 27, 2011*

**Physics**

A cannon ball is shot from a cannon with a horizontal velocity of 200m/s. What is the time until impact on a target 50m downrange? What is the objects horizontal velocity at impact (ignoring air resistance)?

*October 7, 2011*

**pre-calculus**

a ship passes by buoy b which is known to be 3000 yd from peninsula p. the ship is steaming east along line be and angle pbe is measured as 28 degrees. after 10 min., the ship is at s and angle pse is measured as 63 degrees. how far from the peninsula is the ship when it is at s?

*October 5, 2011*

**pre-calculus**

in Triangle abc, tanA=3/4, tan B=1, and a=10. find b in simplest radical form.

*October 3, 2011*

**pre-calculus**

How do I prove that sinx/sinx+cosx=tanx/1+tanx

*October 3, 2011*

**pre-calculus**

thank you so much for all your help. i understood it now!

*September 29, 2011*

**pre-calculus**

pre-calculus and i didn't understand where the d and cos came from

*September 29, 2011*

**pre-calculus**

suppose a triangle has two sides of lengths a and b. if the angle between these sides varies, what is the maximum possible area that the triangle can attain? what can you say about the minimum possible area? could you explain by detail

*September 29, 2011*

**pre-calculus**

i don't understand where did the d come from and how did you turn it into cos?

*September 28, 2011*

**pre-calculus**

suppose a triangle has two sides of lengths a and b. if the angle between these sides varies, what is the maximum possible area that the triangle can attain? what can you say about the minimum possible area?

*September 28, 2011*

**pre-calculus**

find the area of the segment formed by a chord 24 cm long in a circle of radius 13 cm.

*September 28, 2011*

**math**

put in order from least to greatest; 3/3, 3/5, 3/6, 3/8

*September 14, 2011*

**Maths**

So if I'm using the area 8558.25 in that math I need to have it as 8558.25squared and then sqaure root it?

*April 24, 2011*

**Grammar**

Grammar is generally about what 'sounds' and 'feels' right. The first one is probably the better of the pair.

*April 23, 2011*

**math**

The circumfrence will be 43.98230 inches

*April 23, 2011*

**Check my math please**

Total Rainfall = rainfall mm x area covered In order to ensure that our values are correct we will need to convert the area covered (the total area of the two tanks) from metres into millimetres. We will also need to convert the total rainfall (KL) into mm. Total Rainfall = ...

*April 23, 2011*

**Math**

Okay so I'm trying to work out how many mm of rain fell in a certain area. I've got the total volume/capacity that fell (3.51125KL) and the total area that it fell in (8558.25m). My formula is Total Rainfall = rainfall mm x area covered How would I make sure that all ...

*April 23, 2011*

**Math**

Thanks! Ermm what if I have the 'total rainfall' in KL?

*April 23, 2011*

**Math**

Also, sorry, if I already HAVE the total rainfall and I'm solving for the rainfall mm but I don't need the duration of the storm would this formula be ok? Total rainfall = rainfall mm x area covered

*April 23, 2011*

**Math**

Hey I'm working on a math assignment and I'm trying to work out the total amount of rainfall that fell in a certain area. Would this formula be correct? Total rainfall = rainfall mm x duration of storm minutes x area covered And with my rainfall mm I change it out so ...

*April 23, 2011*

**science**

Where can I get any good scientific journals which might have info on dingoes

*April 19, 2011*

**A level english literature**

hmmm. So is it comparative or analytical?

*April 19, 2011*

**math**

can someone plzz tell me whichone is true. just but down the number when u answer back plzz & thank you 1. 14+(-25)> -50= 2. 20*10^3 3. 3/4 + 3/4> 1 4. 6^2=2^6 5. -21-(-39)=60 6. 19 7. 11*11*11 = 33^3 8. 38<7^2-(-20) 9.-5=20+(-25) PLEASE HELP ME!!!!

*February 24, 2011*

**math**

plzzzzzz help me

*February 24, 2011*

**chemistry**

I have a lot of trouble doing this chemistry exercise It says: The altitude of the lake affects the solubility of oxygen in lakes high in the alps. if the solubility of O2 from the air is 7.89 mg/L M at sea level and 25C, what is the solubility of O2 in moles/L at an elevation...

*February 11, 2011*

**history maps**

1 5/8 inches represents about how many miles on the scale bar on the political map legend? 3.8 centimeters represents about how many kilometers?

*November 19, 2010*

**math**

38.75

*October 13, 2010*

**Physics**

The space shuttle releases a satellite into a circular orbit 440 km above the Earth. How fast must the shuttle be moving (relative to Earth) when the release occurs?

*October 11, 2010*

**physics**

thank you so much

*September 21, 2010*

**physics**

a cheetah can accelerate from rest to 24 m/s in 2.0 s . Assuming the acceleration is constant over the time interval, a)what is the magnitude of the acceleration of the cheetah? b) what is the distance traveled by the cheetah in these 2.0 s.? c) a runner can accelerate from ...

*September 21, 2010*

**algebra**

Thanks can u give me another problem

*April 26, 2010*

**World History**

What started the civil war in china?

*March 21, 2010*

**World History**

How was mao's vision of communism different from that of lenin?

*March 21, 2010*

**world history**

What single event set in motion the start of WW1?

*March 21, 2010*

**US History**

In what ways did the progressive belief in using experts played a role in shaping roosvelts reforms?

*March 2, 2010*

**science**

Why was the discovery of microspheres and coacervates an important contribution to the understanding of how life might have originated on Earth?

*February 22, 2010*

**7th grade**

what did the electrician say after fixing a light bulb at the top of the empire state building?

*December 7, 2009*

**math**

what did the donut say to the filling?

*December 6, 2009*

**living enviroment**

how do yuh break the the spermatogenesis and get the meaning for example biology bio=life ; logy = study of

*November 3, 2009*

**chemistry**

A 2.000g sample of magnesium was burned in air to form an oxide. After the product was purified it was found to have a mass of 3.317g. What is the empirical formula for the product? I know how to find a empirical formula, I just don't understand what masses I am supposed ...

*October 29, 2009*

**english**

NEED TO DO SENTENCES WITH THESE WORDS] USING,WAVE,MOAN,CLOSE,DREAM,TRADING,SKATE,LOOK,SKATING,TRADE,CLEAN,WRITING.

*March 4, 2009*

**Algebra**

z^5-28z^3+27z=0 How do you use variable substitution and factoring to find all of the roots of this equation? I know how to do it if the z would have only been to the fourth power, but how do you do it with an odd numbered power like this? Thanks!!

*January 18, 2009*

**Algebra**

What do you do in synthetic division when there's a two digit number? For example, this is what I'm synthetically dividing 3 2 5 7 3 3 1 8 8 times three is 24, so what should I do? Thanks for your help Tatie

*January 18, 2009*

**Algebra**

How come log5 25^4 reduces to 4 log5 25 then 4 times 2 then finally eight?

*January 17, 2009*

**Algebra**

We are learning using the log button in algebra. I have a TI-83 calculator. My book says that log10 85 (there is no space between thet 10 and the 85, that's just to show the different numbers) is equal to 1.93 approximately. But I got 85. How do you properly type this in? ...

*January 17, 2009*

**math**

how do you draw a oblique discrete line

*October 26, 2008*

**math**

how do you find the plot the slope and y-intercept 2y=4x-4

*July 25, 2008*

**social studies**

how did events in the west help the Patriots' cause?

*May 19, 2008*

**math**

How do you soleve radicals

*March 4, 2008*

**englise**

i need help with home work and i don't know what some of the stuff means i can Help tatiana i got an A in english Please ask specific questions and include what you think the answers might be. Someone here will be happy to help you. =)

*May 31, 2007*

**economics**

What were the original causes of the u.s. trade deficit? Help please ASAP Check this site. (Broken Link Removed)

*April 24, 2007*

**Economics**

How did the Four Modernizations make the Chinese economy more like the U.S. free enterprise system? Check this site for some information. http://en.wikipedia.org/wiki/Four_Modernizations

*April 19, 2007*

**Economics**

What were the drawbacks of central planning in the former Soviet Union...Plz help ASAP LUV tatiana It was political, as opposed to practical. It relied on false data, provided politically correct. It failed to allow for market forces, producing much that was not needed. It ...

*April 19, 2007*

**Home Economics**

Q: How did conflict over the First and Second Banks of the United Sates reflect Federalist and Antifederalist views of government? Federalist view http://en.wikipedia.org/wiki/Federalist_Party_(United_States) http://www.nycgovparks.org/sub_your_park/historical_signs/...

*April 16, 2007*

**environmental science**

well thats actually seven but once i find the other two i will get them posted.. asap!!!

*March 17, 2007*

**environmental science**

Nine cultivation practices that can be used to help pests control are... crop diversity, farm size, soil fertility, pest control, livestock, and organic farming systems. :)

*March 17, 2007*

**chemistry (please check/help)**

How would you make a serial dilution if you have a starting value 100mM of X The are the values of X show different dilutions. Volume variables (x) mL 0 1 3 1 10 30 100 We starting out with 100mM of X which would be considered its concentration. In order to describe how to do ...

*January 28, 2007*

**chemistry (work shown)**

How would you make a serial dilution if you have a starting value 100mM of X The are the values of X show different dilutions. Volume variables (x) mL 0 1 3 1 10 30 100 We starting out with 100mM of X which would be considered its concentration. In order to describe how to do ...

*January 28, 2007*

**Chemistry (please help)**

How would you make a serial dilution if you have a starting value 100mM of X The are the values of X show different dilutions. I think she wants to know starting from 100mM of X how you would get the X values through a serial dilution. X 0 1 3 1 10 30 100 If you could help me ...

*January 28, 2007*

**Chemistry (please help)**

How would you make a serial dilution if you have 100mM of X These are the values of X that she gave. X 0 1 3 1 10 30 100 These are the values of X in the serial dilution. If you could help me out by start me off because I am kind of confused with the question. Help is ...

*January 27, 2007*

**physics concepts (please check over my work)**

A uniform cyclinder made of lead has the same mass and the same length as a uniform solid cylinder made of wood. The rotatonal inertia of the lead cylinder compared to the wooden one is: I thought at first that the rotational inertia cannot be known or compared because we need...

*December 9, 2006*

**Physics**

Three identical balls, with masses M, 2M, and 3M are fastened to a massless rod of length L as shown. The rotational inertia about the left end of the rod is: Thats the layout below. Would calculus be needed in this problem (intergration) because then Im in trouble. I know the...

*December 9, 2006*

**please check over my work**

A 2.5 kg stone is released from rest and falls toward earth. After 4s, the magnitude of its momentum is: My work: J=F*t =(F *t)= 24.5N * 4s F= 2.5 *9.81= 24.5 J=P P= 98kg m/s A sphere X, of mass 2kg, is moving to the right at 10m/s. Sphere Y, of mass 4 kg is moving to the left...

*November 18, 2006*