Monday
July 6, 2015

Posts by Thomas


Total # Posts: 638

probability
E[T]=9
May 16, 2015

chemistry
under what conditions could the decomposition of Ag2O(s) into Ag(s) and O2(g) proceed spontaneously at 298 K? 2Ag2O(s)---->4Ag(s)+O2(g) dG=22.42 Kj answer= 0.000118 atm.
May 9, 2015

chemistry
dG for the formation of Hi(g) from its gaseous elements is -20.2 kj/mol at 500k. when the partial pressure of HI is 10 atm, and I2 0.001 atm, what must the partial pressure of hydrogen be at this temperature to reduce the magnitude of dG for the reaction to 0. H2(g)+I2(g)----&...
May 9, 2015

college chemistry
at its melting point, O c, the enthalpy of fusion of water is 1.435 kcal/mol. what is the molar entropy change for the melting ice at 0C? answer: 5.26 cal/mol-k
May 9, 2015

college chemistry
thanks
May 9, 2015

college chemistry
for the reaction at 298 K 2A+b ---->C enthalpy=100 K/cal entropy= 0.050 kcal/k assuming enthalpy and entropy to be constant over the temperature range, at what temperature will the reaction become spontaneous? answer: T>2000K
May 9, 2015

college chemistry
im confused i found those as the standard enthalpies and entropies for pcl3? i cant get answer
May 9, 2015

college chemistry
is it 306.4/33.2?
May 9, 2015

college chemistry
what is dHvap?
May 9, 2015

college chemistry
estimate the normal boiling point of Pcl3 answer: 333 K how do you get it?
May 9, 2015

LA
I need help too
May 7, 2015

Chemistry
Check my work & answer please. I need to make sure I am able to do this type of problem correctly. A typical car engine produces 44,000 kJ of heat in an hour. The cooling system has a capacity of 8.40 L and is filled with a 50:50 mixture of anti-freeze (specific heat capacity ...
April 19, 2015

Chemistry
4. A typical car engine produces 44,000 kJ of heat in an hour. The cooling system has a capacity of 8.40 L and is filled with a 50:50 mixture of anti-freeze (specific heat capacity of 8.37 J/g-oC, density of 1.038 g/mL). In maintaining a constant engine temperature, the ...
April 18, 2015

Physics
A 1100- kg car collides with a 1400- kg car that was initially at rest at the origin of an x-y coordinate system. After the collision, the lighter car moves at 20.0 km/h in a direction of 25 o with respect to the positive x axis. The heavier car moves at 23 km/h at -50 o with ...
April 16, 2015

Earth Science
You doing this? pkwy.k12.mo.us/homepage/skang/file/Astronomy%20Review.pdf From here the answer would be C - Full moon.
April 9, 2015

Math
Volume of cube = 1ml How many ml in 1.5L?
April 9, 2015

science
Compare today's temperature of the universe to the temperature of the universe right after the big bang. That will give you your answer.
April 9, 2015

science
The average temperature of the universe today is approximately 2.73 kelvins (−270.42 °C; −454.76 °F), based on measurements of cosmic microwave background radiation. What was it like back then?
April 9, 2015

science
I'm sorry but please reread the article. We even quoted the answers for you but you don't want to put any effort into reading them and trying to figure out what the quotes are saying. You want the answer to be handed you.
April 9, 2015

science
Thank you Ms. Sue
April 9, 2015

science
2 - 3 paragraphs down it says... "For the first 380,000 years or so, the universe was essentially too hot for light to shine, according to France's National Center of Space Research " Miss that too?
April 9, 2015

science
You obvously didn't read it. The very first sentence in that post the Ms. Sue posted is "The universe was born with the Big Bang as an unimaginably hot, dense point." ... how did you miss that??
April 9, 2015

math
As Ms. Sue mentioned you posting under many names today. Instead of asking questions, why not try to help others or even at least do some work on your questions instead of guessing. I don't mean to be rude here.
April 9, 2015

math
Wrong. Its B The office building is designed with n floors and each floor is 3.9m right so you have right now: 3.9n On top of entire office building is a antenna which is 15.85m tall so its 3.9n + 15.85 = h
April 9, 2015

Math
Yes, your answer is A as mentioned by Steve
April 9, 2015

Calculus
Thank you so much!
April 9, 2015

Calculus
Suppose that y=f(x) = sqrt(2x), x>=0 Find a c > 0 such that the tangent line to the curve y = f(x) at x = c has the same slope as the tangent line to the curve y = f^–1(x) at x = c. You get: c = 1/8 c = 1/2 c = (1/8)^(1/3) c = (1/3)^(2/3) c = (1/2)^(1/3)
April 9, 2015

math
coin = 1/2 Cube has number 1, 2, 3, 4, 5, and 6 so 2, 4, 6 are even numbers which is 1/2 of the cube So 1/2*1/2 = 1/4
April 9, 2015

Calc AB
Thank you. I was taking the inverse of (x+3)^3 + 2 and then I got stuck after that.
April 9, 2015

Calc AB
Let f(x) = (x+3)^3 + 2. The graph of the inverse function y = f^–1(x) has a vertical tangent at: (Hint: Think about the symmetry of the 2 graphs.) (66, 1) (2, –3) (10, –1) (–3, 2) (–1, 10)
April 9, 2015

Math
Got this one. Its 1/24 correct?
April 9, 2015

Math
Suppose f(x) = 4x^5-(1/x^4) Find the slope of the tangent line to the graph of y = f^–1(x) at (3, 1). You get: 1/24 1/16 00062 1620 972
April 9, 2015

Calc AB
Are you possibly Steve Hawkins? Your getting this one after another.
April 9, 2015

Calc AB
Suppose that f(x) is an invertible function (that is, has an inverse function), and that the slope of the tangent line to the curve y = f(x) at the point (2, –4) is –0.2. Then: (Points : 1) A) The slope of the tangent line to the curve y = f –1(x) at the point...
April 9, 2015

Math
It was B
April 9, 2015

Math
B??
April 9, 2015

Math
derivative: sin(pi*cosx) = -pi sin(x) cos(pi cos(x))
April 9, 2015

Math
Inverse of sin(pi*cosx) = cos^(-1)((sin^(-1)(x))/pi) Derivative of cos^(-1)((sin^(-1)(x))/pi) is -1/(sqrt(1-x^2) sqrt(pi^2-sin^(-1)(x)^2))
April 9, 2015

Math
Suppose f(x) = sin(pi*cosx) On any interval where the inverse function y = f –1(x) exists, the derivative of f –1(x) with respect to x is: a)-1/(cos(pi*cosx)), where x and y are related by the equation (satisfy the equation) x=sin(pi*cosy) b)-1/(pi*sinx*(cos(pi*cosx...
April 9, 2015

Calc AB
c)(1/2)x^(-1/2) is the correct answer
April 9, 2015

Calc AB
Wait f^-1(x) is 2sqrt(x) so then the derivative of that is 1/sqrt(x)
April 9, 2015

Calc AB
That would be 1/(dy/dx) of x^2-4x+4 which would be 1/2x-4 correct?
April 9, 2015

Calc AB
Suppose that y = f(x) = x^2-4x+4 Then on any interval where the inverse function y = f^–1(x) exists, the derivative of y = f^–1(x) with respect to x is: a) 1/(2x-4) b) 1/(2y-4), where x and y satisfy the equation y=x^2-4x+4 c)(1/2)x^(-1/2) d)(1/2)x^(1/2) e) Both 1/(...
April 9, 2015

Calculus AB
Yep I was correct
April 9, 2015

Calculus AB
well lets see. Since f^-1(x) = 9-x^2 then the derivative of 9-x^2 is -2x correct?
April 9, 2015

Calculus AB
For the function f(x) = sqrt(9-x), which is equal to d/dx(f-1( -1 is the inverse)(x)) a) -2x b) sqrt(x) + 9 c) x^2 + 9 d) 2x e) 9-x^2
April 9, 2015

Calculus
Answer is 1/(2y-4) where x and y are related by the equation (satisfy the equation) x=y^2-4y+5 x>= 1
April 9, 2015

Calculus
inverse of x^2 - 4x +5 is 2±sqrt(x-1) and the derivative of that is (2x-4) but I don't know how to get the x>= 1 or x>= 2
April 9, 2015

Calculus
For the function f(x) = x^2 - 4x +5, x>= 2, which is equal to d/dx (f-1 this is the inverse)(x)) ? 1/(2y-4) where x and y are related by the equation (satisfy the equation) x=y^2-4y+5 x>= 1 2y-4 where x and y are related by the equation y= = x^2 - 4x +5, x>= 2 1/2x-4 ...
April 9, 2015

Calc AB
I believe that it is Either I or III
April 9, 2015

Calc AB
Remember that f(x) must be one-to-one (only one y-value for each x-value) over the domain where f –1(x)is defined as a function. So, in some cases you must restrict the domain of f(x) so that it's one-to-one. There might be more than one section of domain that's ...
April 9, 2015

Calc
Figured it out. 33/2
April 9, 2015

Calc
Find the area of the region bounded by the curves y2 = x, y – 4 = x, y = –2, and y = 1. So far I have found that the area of the trapezoid which is 13.5. But for the other two areas I cannot find them. They could be: 27/2 22/3 33/2 34/3 14 I believe that it is 14 as ...
April 9, 2015

Physics
A rock is thrown directly upward from the edge of the roof of a building that is 35.3 meters tall. The rock misses the building on its way down, and is observed to strike the ground 4.00 seconds after being thrown. Neglect any effects of air resistance. With what speed was the...
March 21, 2015

science
Measuring the speed of light thru gelatin using a laser
March 4, 2015

algebra
Use the formula d = 1.22ãx to estimate how many miles a 5-foot-tall person can see standing on the deck of a ship that is 50 feet above the ocean.
February 9, 2015

Physics
A gardener pushes a mower at a distance of 900 m while mowing the yard. The handle of the mower makes an angle of 40.0 with the ground. The gardener exerts a force of 35.0 n along the handle of the mower. How much work does the gardener do in mowing the lawn?
January 26, 2015

Science
no its alleles
November 6, 2014

science
Hey thanks.
November 6, 2014

science
is a starch a complex carboydrate
November 6, 2014

science
is a complex sugar an example of a starch? is a simple sugar an example of glucose?
November 6, 2014

science
are starches and glucose all types of carbohydrates?
November 6, 2014

Math
Find the coordinates of the point at 180 degrees on a circle of radius 3.4 centered at the origin. Round your answers to three decimal places, if required. ( , 0 ) I got 0 as the y coordinate. Please help me solve for x
October 24, 2014

math
A craft store bought paint for a wholesale price of 100 the store charges a 65% markup what is the craft stores price for the paint.
October 21, 2014

math
From a box containing 5 blue marbles,10 red marbles,and 8 yellow marbles,Lisa removed 3 marble,one of which was blue.f she removes one more marble at random,what is the probability that it will be blur? a. 1/4 b. 5/21 c. 1/5 d. 2/7 e. 1/6 please answer and explain
October 16, 2014

maths
95. Suppose that 387 people will travel on a space shuttle with room for 420 people.Each compartment seats 14 people before the next compartment opens.How many people will ride in the last compartment that opened?
October 9, 2014

maths
99. From a box containing 5 black marbles,8 pink marbles, 6 white marbles, and 5 yellow marbles, Kim removed 4 marbles,one of which was black.If she removes one more marble at random,what is the probability that it will be black? a. 1/6 b. 4/21 c. 1/5 d. 5/21 e. 1/4 please ...
October 9, 2014

english 122
when you contribute to a research conversation, which of the following skills is not strictly?
October 9, 2014

Physics
Two small charges with a mass of 1.0 g each are connected by 2.0-cm-long insulating rod of negligible mass. Each ball has the same magnitude of charge of 10 nC, but with opposite sign. The rod is held in a 1.0 × 104 N/C uniform electric field at the angle of 30°, ...
October 8, 2014

algebra
When reading some schematics of a rectangular garden you see the binomial x +8 feet represents the length and the binomial x - 1 represents the width. Write an expression that represents the total area of the garden in the form x2 (squared) + bx + c by using the distributive ...
September 18, 2014

math
Linda did 24 problems out of 25 correctly.In the next test she did twice as many examples correctly but received a mark only half as good.How many problems were there in the second test?
September 18, 2014

math
Age Group (Per cent) 46 and over (25) 40-45 (34.5) 35-39 (25.62) 30-34 (12.9) Under 30 (1.9)
September 18, 2014

math
Distribution of Employees in National Insurance Company by age groups:(for questions 76-78) Age Group Per cent 46 and over 25 40-45 34.5 35-39 25.62 30-34 12.9 Under 30 1.9 76. Thirty thousand employees of this company are 46 years or over.How many thousand(to the nearest 0.1 ...
September 18, 2014

trigo
An airplane travels on a bearing of 245 degrees at an airspeed of 200 kilometers per hour while a wind is blowing 50 kilometers per hour from 140 degrees. Find the ground speed of the airplane and the direction of its track, or course, over the ground.
September 16, 2014

math
A point,X ,is 25 feet from the center of a circle.If the diameter of the circle is 14 feet,what is the length (in feet)of a tangent from point X to the circle? a. square root 29 b. 18 c. 15 square root 2 d. 24 e. square root 673 please answer and explain
September 14, 2014

statistics
Advertisers contract with Internet service providers and search engines to place ads on websites. They pay a fee based on the number of potential customers who click on their ad. Unfortunately, click fraud—the practice of someone clicking on an ad solely for the purpose ...
August 11, 2014

physics
Two boat landings are 8.0 km apart on the same bank of a stream that flows at 2.8 km/h. A motorboat makes the round trip between the two landings in 50 minutes. What is the speed of the boat relative to the water?
August 10, 2014

math
What is the value of 4^5 + 4^5 + 4^5 + 4^5 + 4^5 + 4^5 + 4^5 + 4^5 + 4^5 + 4^5 + 4^5 + 4^5 ? a. 12 x 2^5 b. 24^5 c. 3 x 2^5 d. 4^60 e. 3 x 4^6 please answer and explain
August 10, 2014

math
If the number of square inches in the area of a circle is equal to the number of inches in its circumference,the diameter of the circle is a. 4 inches b. 2 inches c. 1 inches d. pi inches e. 2 pi inches please answer and explain
August 9, 2014

math
I have 10 question like this, anybody can show me this one how to do it. Simplify the following and give answers in scientific notation: 0.00320 x 450,000 / 90,000
August 8, 2014

math
Write the set of integers that satisfy the sentence: I had 10 question for this,anybody can show this one how to do it. 4 > n > 0
August 8, 2014

math
In a certain boy's camp, 30% of the boys are from New York State and 20% of these are from New York City.What percent of the boys in the camp are from New York City? a. 60% b. 50% c. 33% d. 10% e. 6% please answer and explain
August 8, 2014

math
If the number of square inches in the area of a circle is equal to the number of inches in its circumference,the diameter of the circle is a. 4 inches b. 2 inches c. 1 inches d. pi inches e. 2 pi inches please answer and explain
August 8, 2014

math
If the circumference of a circle is the same as the perimeter of the square with a side as 4 pi in, what is the area of the circle in square inches?
August 8, 2014

math
I'm just helping my younger brother.
August 7, 2014

math
so, (2600-440)/4.5=480 answer c, thank you
August 7, 2014

math
If x = 1/x^2, then 2 + 3 = a. 13/36 b. 1/5 c. 5/6 d. 1/8 e. 5/13 please answer and show work
August 7, 2014

math
I don't understand what is the question mean
August 6, 2014

math
The approximate distance,S, in feet that an object falls in t seconds when dropped from a height can be found by using the formula S = 16t^2.In 8 seconds, the object will fall a. 256 feet b. 1,024 feet c. 1,084 feet d. 2,048 feet e. 15,384 feet please answer and explain
August 6, 2014

Physics
If the thickness of the probe in the direction of B is 1.97 mm, calculate the charge-carrier density (each of charge e).
August 2, 2014

math
is it answer c. 30 + 7c?
May 30, 2014

math
why -3 , because the first 3 minutes ?
May 30, 2014

math
10 cents per minute for the first 3 minutes = 30 cents ,but I don't know what is 10-c cents for each minute thereafter?
May 30, 2014

math
43. A phone company charges 10 cents per minute for the first 3 minutes of a call, and 10-c cents for each minute thereafter.What is the cost, in cents, of a 10-minute phone call?
May 30, 2014

math
type mistake: 10 cents per minute for the first 3 minutes = 30 cents
May 30, 2014

math
10 cents per minute for the first 3 minutes + 30 cents, but I don't know what is 10-cents for each minute thereafter?
May 30, 2014

math
43. A phone company charges 10 cents per minute for the first 3 minutes of a call, and 10-cents for each minute thereafter.What is the cost, in cents, of a 10-minute phone call? a. 200-20c b.100c+70 c. 30+7c d.100-7c e. 100-70c please answer and explain
May 30, 2014

math
When a is divided by 7,the remainder is 4.When b is divided by 3,the remainder is 2.If 0<a<24 and 2<b<8, which of the following could have a remainder of 0 when divided by 8? a. a/b b. b/a c. a-b d. a+b e. ab please answer and explain
May 30, 2014

math
54. The volume of certain rectangular solid is 12x. If the dimensions of the solid are the integers x,y,and z,what is the greratest possible value of z? a. 36 b. 24 c. 12 d. 6 e. 4 please answer and explain
May 26, 2014

math
When x is divided by 3,the remainder is z.In terms of z, which of the following could be equal to x ? a. z-3 b. 3-z c. 3z d. 6+z e. 9+2z please answer and explain
May 26, 2014

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