Wednesday
September 3, 2014

Posts by Bob


Total # Posts: 2,375

Math (Combinatorics)
A newly designed international airport is planning to label its gates. Each gate must be assigned a letter from the alphabet from A to M (13 in all), and a number from 1 to 15. To avoid confusion, any two gates must be assigned a different letter, or a different number (or ...
April 3, 2013

science
1mole of liquid water at 25 c and 1 atm forms 1 mole of steam at 100 c and 1 atm. the molar heat capacity of water 373 k is 40.79kj/mol and the molar heat capacity of water is 75.3 J. assume ideal gas behavior for steam. Calculate delta U, delta H and delta S
March 29, 2013

Math
-5(t-8)-(t+7)=6
March 28, 2013

math
The real answer is 69
March 28, 2013

algebra1
explain in more detail plz
March 28, 2013

english
can you help me find facts and figures why teens should voulunteer if possible how many teens like volunteering i apreciate your help.
March 25, 2013

math
15.2
March 25, 2013

economics
Maria can read 20 pages of economics in an hour. She can also read 50 pages of sociology in an hour. She spends 5 hours per day studying. a. Draw Maria's production possibilities frontier for reading economics and sociology. b. What is Maria's oppurtunity cost of ...
March 24, 2013

English
Why should grade 8 students have to do volunteer hours to graduate grade 8? Please provide me with atleast 6 points and so I can expand on it. Your help is very much appreciated!:)
March 23, 2013

math
uh
March 21, 2013

Math
How to find the exact value of tan(sin^-1x/2) I'm having trouble with finding the inverse of sin x/2 value.
March 19, 2013

Math
Thanks.
March 19, 2013

Math
What is the inverse trig function cotangent of square root of 3/3? What is the value?
March 19, 2013

Combinatorics
Bob is at an amusement park with 10 different rides. He only has time to go on 3 rides, before he needs to head back for his curfew. If he only wants to go on each ride a maximum of one time, how many different ways are there to go on 3 rides?
March 19, 2013

Chemistry
15.5 M
March 18, 2013

physics
A small plastic ball of mass m = 1.50 g is suspended by a string of length L = 15.5 cm in a uniform electric field, as shown in the figure below. If the ball is in equilibrium when the string makes a θ = 19.0° angle with the vertical as indicated, what is the net ...
March 15, 2013

microeconomics
20
March 15, 2013

Math
Of 30 students, 12 play football, 17 play soccer, and 5 play both, how many play neither?
March 12, 2013

math
kevin drew a scale drawing of his living room,The actual room is 16 feet long.If the room is 12 inches long in the drawing,what is the scale of the drawing?
March 6, 2013

civics
At the Constitutional Convention of 1787, a major conflict between the delegates centered on the issue of __________.
March 6, 2013

Social Studies
How did the immigrants who came to the United States between 1820 and 1860 change the character of the country?
March 4, 2013

English
I say 3. I go to a museum to look at pictures...
March 4, 2013

Science
i need help on a compound machines
March 2, 2013

chemisty
found the answer to be 36.03 ml
February 28, 2013

chemisty
Hydrogen peroxide can be prepared by the reaction of barium peroxide with sulfuric acid according to BaO2(s)+H2SO4(aq)=BaSO4(s)+H2O2(aq) How many milliliters of 5.00 M H2SO4(aq) are needed to react completely with 30.5 g of BaO2(s)?
February 28, 2013

Math
Is this true or false? To expand the binomial (x2 + 3)6, use the row of Pascal's triangle that has coefficients 1, 5, 10, 10, 5, 1.
February 28, 2013

math
how to solve: tan(sin(x))=tan(x)sin(x)?
February 27, 2013

physics
a 3000 pound car is parked on a hill at an angle of elevation of 16 degrees. how much force must the brakes exert to keep the car from rolling down the hill?
February 27, 2013

Ms. Sue please help
What is the highest temperature in the exosphere.
February 26, 2013

math
Hahaha! Oh Steve you crack me up with all that verbage and question asking. Anyways the question said to find a14, NOT a11. a14 = 15/199. So out of the wordy answer choices Paige gave, the answers C.
February 26, 2013

science
what is the structural formula for a) 3,3,4-trimethyloctane B) 2-methyl-1-pentene
February 26, 2013

science
A 65.7 kg person jumps from a window to a fire net 21.0 m below, which stretches the net 1.14 m. Assume that the net behaves like a simple spring, and calculate how much it would stretch if the same person were lying in it.
February 24, 2013

Physics
A bungee jumper with mass 69.7 kg jumps from a high bridge. After reaching his lowest point, he oscillates up and down, hitting a low point eight more times in 39.0 s. He finally comes to rest 25.0 m below the level of the bridge. Calculate the spring constant of the bungee ...
February 24, 2013

Earth Science
Which organism evolved before the others in geologic time? mammals amphibians reptiles **fish Which type of organism evolved later than the others? **mammals amphibians reptiles fish
February 23, 2013

math
Reiny is weird
February 21, 2013

Math Gr.12 (Calculus)
How do i do this? 3= 6x^2 - 2x -8
February 21, 2013

computer science
Who invented Java?
February 20, 2013

Microsoft excel unit
Determine the present value of a pension plan that will pay you 20 yearly payments of $7,000 each;the current rate of return in 7.5%
February 18, 2013

BIOLOGY PLEASE HELP!!!!!!!!!!!!!!!!
actually its atp synthase
February 14, 2013

BIOLOGY PLEASE HELP!!!!!!!!!!!!!!!!
embedded protein in the electron transport chain where h+ ions flow back into the matrix of the mitochondria Crossword puzzle 11 spaces sixth letter is n cant figure it out?
February 14, 2013

biology
inner membrane space
February 14, 2013

biology
Its a Crossword
February 14, 2013

biology
where do h+ ions accumulate in the mito chondria? 18 spaces 17th letter is c cant figure it out?
February 14, 2013

biology
embedded protein in the electron transport chain where h+ ions flow back into the matrix of the mitochondria 11 spaces sixth letter is n cant figure it out?
February 14, 2013

Biology
what molecule is released before acetyl coa enters the krebs cycle Doing cross word puzzle 13 spaces cant figure it out?
February 14, 2013

SCIENCE
HOW DOES THE FORMATION OF SEDIMENTARYROCK IN THE OCEAN CONTRBUTE TO TH FORMATION OF OIL
February 12, 2013

SCIENCE
HW DOES SEDIMENTARY ROCK FORMED
February 12, 2013

physics
a. 2 b. 4 c. 4 do you have answer for problem 11?
February 12, 2013

math
Thanks many many times
February 11, 2013

math
1/4x + 13 > .25(2x-32)
February 11, 2013

Math
Solve the equation: 4x^2 + 100 = 0 Here is my work: 4x^2 + 100 = 0 - 100 - 100 4x^2 =0 /4 /4 x = -5 or 5. Did I do this correctly?
February 10, 2013

Algebra
Write the expression in descending exponent form. -7y + 8y3 - y6 I think I have to combine like terms but I don't know how. Please help?
February 9, 2013

physics
A positive test charge of 6.47 × 10^−5 C is placed in an electric field of 50.12 N/C intensity. What is the strength of the force exerted onthe test charge? Answer in units of N
February 8, 2013

MATH
NOლ(ಠ_ಠლ)
February 7, 2013

Trigonometry
Which of the following is not a solution of the equation tan squared A =3? (1) -pie/3 (2) 2pie/3 (3) 5pie/6 (4) 120 degrees
January 29, 2013

trig
To the nearest degree, all of the following angles are solutions of the equation 2sin x + 4 cos 2x =3 except: (1) 40 degrees (2) 150 degrees (3) 166 degrees (4) 194 degrees
January 29, 2013

Physics
Calculate the kinetic energy that the earth has because of (a) its rotation about its own axis and (b) its motion around the sun. Assume that the earth is a uniform sphere and that its path around the sun is circular. For comparison, the total energy used in the United States ...
January 29, 2013

Physics
When some stars use up their fuel, they undergo a catastrophic explosion called a supernova. This explosion blows much or all of a star's mass outward, in the form of a rapidly expanding spherical shell. As a simple model of the supernova process, assume that the star is a...
January 29, 2013

math
the areas of two similar rectangles are 338 cm squared and 73 cm squared. what is the similarity ratio of the perimeters
January 29, 2013

us history
who developed the first fiscal plan?? was it hamilton and who was the author of the great compromise in constitution? was it madison
January 28, 2013

MicroEcon
Suppose that you supply bottled water in a competitive market and that you are producing the profit-maximizing quantity of bottled water. If you can sell your water at $2 a bottle and you currently employ five workers at a wage of $50 a day, what is the value of the marginal ...
January 28, 2013

science
how to calculate calories is food
January 24, 2013

Statistics
Which of the following statements is not true about samples that can be treated as matched pairs data? I. Data collected on these samples is analyzed by calculating the differences between paired observations and using that data in one sample tests. II. Each value in the first...
January 24, 2013

Physics
C is the correct answer. Both have resistance to current (though the filament's resistance is most likely very small, compared to the resistor). Their combined resistance R1+R2, is the load.
January 24, 2013

Math
It is a square, so you have to find the area, which is length times width. The length is 24 rows and the width is 48 seats. So you do 24 X 48 which equals 1152, so the theater can hold 1,152 people.
January 23, 2013

Math 8 - help!
Y=4X + B
January 23, 2013

Physics
You need to use vectors because there is an angle and you know the initial velocity, and acceleration but not the final velocity. Make a picture and write out all information given to you in columns labeled X and Y directions. Then plug them into different kinematic equations ...
January 23, 2013

English
8.deluged 9. Verges 10. logical
January 23, 2013

physics
what is the velocity of the object as a function of time? for 0s < t < 10s
January 22, 2013

Pre algebra
Thx
January 22, 2013

Pre algebra
On a map the scale is 1 cm:50 ft. The distance between the post office and the fountain is 6 cm. What is the actual distance?
January 22, 2013

Math
Find the general solution F(x,y)=C of the differential equation: (-3(x^2)y-8x)dy+(-3xy^2-8y)dx=0 Where F(x,y)=___________________
January 22, 2013

Math
11.
January 22, 2013

algebra
nt=440
January 22, 2013

Physics
A ball player hits a home run, and the baseball just clears a wall 20.6 m high located 132.0 m from home plate. The ball is hit an an angle of 35° to the horizontal, and air resistance is negligible. Assume the ball is hit at a height of 1.1 m above the ground. (a) What ...
January 20, 2013

math
suppose you invest $500 in a savings account that pays 3.5% at an annual interest. When will the account contain $650?
January 20, 2013

per-algebra
whats the sequence,common difference or common ratio and the next three terms of the sequence of 10,18,26,34
January 17, 2013

Geometry :)
Thanks :)
January 15, 2013

Geometry :)
Use coordinate geometry to prove that the quadrilateral formed by connecting the midpoints of a kite is a rectangle. I have no Idea how to do this problem, so if anyone could help I would be very greatfull. :)
January 15, 2013

7th grade art ASAP please
This was perfect!!!!!!!!!!!!!!!!!!!!! All Correct. I just Got 100% on my quiz
January 14, 2013

Algebra
Factor the GCF out of 5x2 - 10x? I know I need to find the GCF of the coefficients but I need to write it using the distributive property. Help please?
January 13, 2013

geometry
What is the most precise name for quadrilateral ABCD with vertices A(–3, 2), B(–1, 4), C(4, 4), and D(2, 2)? 1. parallelogram 2. rhombus 3. quadrilateral 4. rectangle
January 11, 2013

chem
What volume of 0.250 M H2SO4 is required to titrate a solution containing 0.200 g of KOH to its endpoint?
January 11, 2013

chemistry
Calculate the density of M&M’s given the following data: Mass of 250.0 mL beaker = 197.816 g Mass of beaker and 20 M&M’s = 342.816 g Volume of water in graduated cylinder = 8.0 mL Volume of water in graduated cylinder and 10 M&M’s = 18.5 mL (Points : 3)
January 10, 2013

chem
A 14.3 L sample of gas at 23.45°C and a pressure of 123.45 kPa is heated until its temperature reaches 43.20°C and its volume is 16.72 L. What is the pressure of the sample of gas
January 10, 2013

chemistry
A student is asked to prepare 250.0 mL of 3.5 M copper (II) sulfate from solid copper (II) sulfate pentahydrate. Describe how this solution should be made in the chemistry laboratory.
January 10, 2013

Chemistry
Thx :)
January 10, 2013

Chemistry
solid sodium reacts violently with water, producing heat, hydrogen gas, and sodium hydroxide. how many molecules of hydrogen gas are formed when 48.7 g of sodium are added to water? 2Na + 2H2O ------> 2NaOH + H2
January 10, 2013

math
12 nickels
January 9, 2013

Math
Explanation please
January 9, 2013

Math
Before 1986, a gold bullion in the Federal Reserve Bank was rectangular and had a volume of approximately 727.7 cm3. The density of gold is 19.3 g/cm3. A pound is approximately 454 g. Find the weight of one gold bullion to the nearest tenth of a pound.
January 9, 2013

math
1.1232 players 2. There are 29 teams because 438\15 =29.2 so there will be a remainder of 2 people. 3. There are 16 students on each team because 544/34 =16. 4. 96 people are on teams (P.S. /=division)
January 9, 2013

math
Which of the following values is in the solution set of the inequality -8-7x>-6 a) 2 b) -2 c) -3 d) -1
January 8, 2013

chemistry
The temperature of a dilute 0.847 M solution of NaBr was increased from 25 degrees Celcius to 40 degrees Celcius. What effect did this temperature change have on the molarity of the NaBr solution?
January 3, 2013

ap chem
The diatomic molecule OH exists in the gas phase. The bond lengthand bond energy have been measured to be 97.06 pm and 424.7 kJ/mol.Knowing that only the 2p orbitals of will interact significantlywith mol, respectively. Assume that the OH molecule is analogous tothe HF ...
January 2, 2013

ap chem
Show how a hydrogen 1s atomic orbital and a fluorine 2p atomic orbital overlap to form bonding and antibonding molecular orbitals in the hydrogen fluoride. Are these molecules sigma or pi molecular orbitals?
January 2, 2013

ap chem
nevermind i got the answer
January 2, 2013

math
Each time the same letter appears it represents the same digit.Different letters represent different digits.C+C=D;D+E=17;A+2C=D;2B+C=8.Find the sum A+B+C+D+E
December 20, 2012

Math
As an invesment Mrs. Astor purchased 2 paintings. She later sold the two paintings for $24,000 each. On one painting she made a 20% profit, but on the other she esperienced a 20% loss. Mrs. Astor lost__________ on her investments in the 2 paintings.
December 20, 2012

math
An escalator moves down at the rate of 60 steps per minute. Alan can walk fast up ordinary steps at the rate of 80 steps per minute. There are 50 steps from one level to another. Alan decides to walk fast up the down escalator. How long will it take him to go up one level?
December 20, 2012

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