Monday
October 20, 2014

Posts by bob


Total # Posts: 2,428

Math (Combinatorics)
In the plane, the points with integer coordinates are called lattice points. Suppose a flea in the plane jumps from one lattice point to another. Each jump is one unit to the right, one unit to the left, one unit up, or one unit down. If the flea starts at the origin and makes...
April 29, 2013

Math (Combinatorics)
How many 4 digit positive integers have the ones digit a multiple of 1, the tens digit a multiple of 2, the hundreds digit a multiple of 3 and the thousands digit a multiple of 4?
April 29, 2013

Math (Geometry-Vectors)
Let θ be the angle between two vectors v and u . If v*u =12, |v|=2, |u|=6√2 and 0∘<θ<180∘, what is the value of θ (in degrees)?
April 29, 2013

Math (Geometry)
Square ABCD has M as the midpoint of AB, N as the midpoint of BC, P as the midpoint of CD and Q as the midpoint of MP. If [AMNPDQ]=20, what is the value of [ABCD]? Details and assumptions [PQRS] refers to the area of figure PQRS.
April 29, 2013

Math (Geometry)
In right triangle ABC, we are given that ∠ABC=90∘ and AC=34. D is a point on line segment BC such that BD=12,DC=18. What is the length of AD?
April 29, 2013

math
So David, you mean, x + y = 11 x - y = 4 x = 7.5 y = 3.5 Then we need to substitute y into the original equation? x + 3.5 = 11 x = 7.5 x - 3.5 = 4 x = 7.5 Adding the values lead x = 15?
April 29, 2013

Math (Quadratic Function)
Suppose p(x)=ax^2+bx+c is a quadratic polynomial satisfying p(7)−p(3)=214. Determine the value of p(9)−p(1).
April 28, 2013

English
When two words in a poem are spelled similarly, but do not have the same sound, the type of rhyme is called_______________. A. eye B. end C. internal
April 26, 2013

Math
A polymomial p(x) = ax^2 + bx + c where a, b, c are some rational, has 1 + root 3 as one of the zeros and also p (2) = - 2, Find values of a, b and c. Please work the solution. Tried it many times but still can't get the answer/ The answer is a = 1, b = -2 and c = -2.
April 26, 2013

Math
A polymomial p(x) = ax^2 + bx + c where a, b, c are some rational, has 1 + root 3 as one of the zeros and also p (2) = - 2, Find values of a, b and c. Please work the solution. Tried it many times but still can't get the answer/ The answer is a = 1, b = -2 and c = -2.
April 26, 2013

Math
A polymomial p(x) = ax^2 + bx + c where a, b, c are some rational, has 1 + root 3 as one of the zeros and also p (2) = - 2, Find values of a, b and c. Please work the solution. Tried it many times but still can't get the answer/ The answer is a = 1, b = -2 and c = -2.
April 26, 2013

Math
A polymomial p(x) = ax^2 + bx + c where a, b, c are some rational, has 1 + root 3 as one of the zeros and also p (2) = - 2, Find values of a, b and c.
April 25, 2013

Solve the following polynomial equati
Solve the following polynomial equation for x : x^2 - 2( a+2)x + (a + 1)(a + 3).
April 25, 2013

Math Please help ASAP
Just follow the rule LCM(X, Y) * HCF (X,Y) = Product of two numbers (X,Y).
April 25, 2013

ALGEBRA!!!!
How many distinct integer values of N between 1 and 1000 are there, such that N=4a+b+4c and 2N=7a+6b+7c for some positive integers a, b and c?
April 25, 2013

statistics
$10,126.65
April 23, 2013

Chemistry
ya
April 22, 2013

Physics
If you've ever watched sailing, you will sometimes see a sailor hanging off the side of the boat, for example in this shot from the movie "The Thomas Crown Affair." Eventually, of course, the sailboat tips over so far that a person cannot keep it balanced. ...
April 22, 2013

Physics
Climbing to the top of Mount Everest is hard. But, it's slightly easier than you might think as people weigh less as they climb to the top. Let WE be a person's weight on top of Mount Everest and WS be their weight at sea level. What is the value of 1−WE/WS? ...
April 22, 2013

Math (Percent discount)
With the holiday approaching, Nancy's Closet is having a sale, where all their clothes are 40% off. Mary, who works there, can get a further staff discount of 30% off the sale price. What is the total percent discount that Mary gets?
April 22, 2013

algebra 2
During the first part of a trip a canoeist travels 26 miles at a certain speed. The canoeist travels 8 miles on the second part of the trip at a speed 5 mph slower. Total time is 3 hours. What was the seed on each part of the trip
April 21, 2013

Calculus
actually theres an integral sign. at the top of the sign theres a 3. At the bottom of it, theres a 2.
April 16, 2013

Calculus
∫3 at top and 2 at bottom x/x^2+1 dx = ? if you could show steps that would be great thanks
April 16, 2013

science
Calculated how many grams of methane (CH4) are in a sealed 80 mL flask at room temperature (22ºC) and 780 mm Hg of pressure. Show all your work.
April 15, 2013

Physics
A small statue has a height of 3.8 cm and is placed in front of a concave mirror. The image of the statue is inverted, 1.9 cm tall, and located 14 cm away from the mirror. Find the focal length of the mirror.
April 11, 2013

math
suppose your salary was 28,500 in 2010 and 32,000 in 2016. Assume your salary follows a linear growth pattern.
April 11, 2013

Physics
The world record for revolutions per minute for an ice skater is 308 RPM, held by Natalia Kanounnikova. You can see a video of the spin here. When she starts the spin and her leg is extended, she's going somewhere between 1-2 revolutions per second. Let's average this ...
April 8, 2013

Physics
You wish to swim across a small river to your friend on the other side. The river is 30 m wide and you begin to swim straight across it at a speed of 1 m/s. The current in the river is 0.5 m/s and so the river carries you downriver as you swim. How far downriver in meters are ...
April 8, 2013

Physics
Recently there has been technological advances that allow for 3-D imaging up to kilometers away from an object. This can be done by using laser light that bounces off an object. By measuring the time it takes the laser light to get to the object and back, one can construct a ...
April 8, 2013

math
what is the formula to calculate the area of a trapziode.
April 6, 2013

math
8.27
April 6, 2013

Calculus (Gr.12) Math
I am not sure how to do this question I know I have to take the derivative but then I am left w/ to unknowns. If a projectile is shot up hill the distance (range) of the landing point up the hill depends on the initial speed of the projectile,v, the angle of inclination, a, ...
April 6, 2013

Quantum Physics
8D ,8E,6C,6D and 9
April 6, 2013

ap calculus
a particle moves along the x axis in such a way that its acceleration at time t, t>0 , is given by x(t)= (ln x)^2. at what value of t does the velocity of the particle attain its maximum
April 5, 2013

help with chemistry
Uranium hexafluoride is a solid at room temperature, but it boils at 56°C. Determine the density of uranium hexafluoride at 67°C at 759 torr. ___g/L I got 12.7 i do not know if this is correct. Please help
April 5, 2013

7th Grade Language Arts!
1.a 2.c 3.c
April 3, 2013

college algebra
solve the equation 8^x=2
April 3, 2013

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

Physics
32
February 10, 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

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