Friday
October 21, 2016

# Posts by tatiana

Total # Posts: 104

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
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

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

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

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
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
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

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

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

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