Tuesday

April 28, 2015

April 28, 2015

Total # Posts: 2,947

**Math Proof**

I know that if x=y, for any epsilon>0, abs(x-y)=0<epsilon
*September 1, 2014*

**Math Proof**

I'm still not seeing it. I have not used epsilon before today
*September 1, 2014*

**Math Proof**

I honestly have no clue how to even start this proof. Other than assume x=y and then assume that abs(x-y)<epsilon
*September 1, 2014*

**Math Proof**

Let x and y be real numbers. Then x=y if and only if abs(x-y)< epsilon for every epsilon>0
*September 1, 2014*

**Math Proof**

Prove that for all integers n > or = 1 and all real numbers x subscript 1, x subscript 2,...., x subscript n. absolute value of (x subscript 1+ x subscript 2+...+ x subscript n) <or= abs(x subscript 1) + abs( x subscript 2)+..+ abs(x subscript n) I know how to do the ...
*September 1, 2014*

**college algebra**

1. divide and simplify x^2+x-56/x^1-1 / x-7/2x+2 2. find the product in simplest from for x^2+x-6/2x^2-x-3 * x^7-2x^6+4x^5/x^4+8x 3. perform the indicated operations and simplify: 2/3x +4/3x^2 y^4 -6/2x^4 y^5 4. perform the indicated operation and simplify x/x-1 + 2x+3/x^2-1 5...
*September 1, 2014*

**geography**

Who is Jane Goodal?
*August 30, 2014*

**Math**

And I did understand that 9 is greater than 7 9+7=16,97 is the answer
*August 25, 2014*

**Math**

That's pretty harsh, and I meant to type 97 but, still that was soooooooooo harsh!!!!!
*August 25, 2014*

**Math**

I don't know
*August 25, 2014*

**Math**

Is 79 correct?
*August 25, 2014*

**Math**

My sister said it was 79 but I don't understand how she got that answer
*August 25, 2014*

**Math**

I'm not sure then
*August 25, 2014*

**Math**

Is it 39
*August 25, 2014*

**Math**

I am a number less than 40. One of my factors is 3. The sum of my digits is 12. What number am I?
*August 25, 2014*

**Basic Physics**

Determine the minimum gauge pressure needed in the water pipe leading into a building if water is to come out of a faucet on the twelfth floor, 41m above that pipe.
*August 25, 2014*

**Physics**

What is the difference in blood pressure (mm−Hg) between the top of the head and bottom of the feet of a 1.88m tall person standing vertically?
*August 25, 2014*

**math**

Thank you I got it....so helpful
*August 7, 2014*

**math**

Oops wrong question I meant to ask When she started saving money, 203 shopping days were left until Christmas. How much money was in her account at Christmas?
*August 7, 2014*

**math**

How much was in her account four weeks after she began saving?
*August 7, 2014*

**math**

I have to find the equation of the line, but I need the expression to solve it.
*August 7, 2014*

**math**

I was trying to find the expression for the problem
*August 7, 2014*

**math**

At the beginning of the summer molly decided to add a little money into her sayings account every week. After seven weeks her account had $175. At the end of 15 weeks her account had $375. Assume that she put the same amount of money into her account every week and will ...
*August 7, 2014*

**Math**

A standard deck of playing cards is shuffled and three people each choose a card. Find the probability that the first two cards chosen are clubs and the third card is black if the cards are chosen with replacement, and if the cards are chosen without replacement.
*July 14, 2014*

**Geometry**

Tan x=(100/50) so X= Tan^-1(100/50), you have to use the inverse of tan therefore, x=63.435
*July 10, 2014*

**US Government**

The answer is True
*July 9, 2014*

**Set Theory: Sideways U with a line under it**

I know the sideways U means "is a subset of" and if there is a line under it, it means "is equal to" I have two sets: {-3,0,3} _____ {-3,-1,1,3} choose the correct symbol a. sideways U with line under it and slash through it b. sideways U with line under it...
*July 6, 2014*

**Set Theory :Complements with Ellipses **

Let U= {1,2,3, . . .}, A= {1, 2, 3, . . . ., 39}. use the roster method to write the set A' Find A' = _____________________________________________ I understand how complements work. Complement A' is everything outside of set A. However, since U goes on infinitely ...
*July 5, 2014*

**math: set theory **

{X|X E N and x greater than or equal to 4} This is a set theory problem: | = means such that is E = is a symbol used to replace the words "is an element of" N= represents all natural numbers answer choices are: a) {5,6,7,...,100} b) {5,6,7,...} c) {4,5,6} d) {4,5,6...
*July 4, 2014*

**English 2b**

What is the definition of a hook? a. a topic sentence that states the main point b. an elaborating sentence that provide details or facts c. an enticing statement that grabs the reader’s interest d. an extension sentence that restates or clarifies the topic sentence
*July 1, 2014*

**English 2b**

Read the paragraph. The snow began falling early in the morning. Tiny, weightless crystals. By early afternoon, the ground was covered with several inches of snow. Snow flurries continued throughout the day. When the evening came, the snow was still falling. At least a foot ...
*July 1, 2014*

**Physics**

Is there normal contact force on a frictionless surface?
*June 28, 2014*

**Physics**

What happens when we bring a mercury barometer to the moon?
*June 28, 2014*

**Physics**

What happens to potential energy during melting
*June 27, 2014*

**Physics**

A motorcycle is travelling at a constant acceleration in a straight line. When it passes by the first lamp post, it is travelling at 10ms-1. When is passes by the next lamp post which is 200m from the first lamp post, the motor cycle is travelling at 16 ms-1. What is the ...
*June 27, 2014*

**Chemistry **

What is the reaction between mno4- and c2o42- and is there a colour change in this reaction?
*June 26, 2014*

**math**

C.
*June 6, 2014*

**Physics**

A soccer ball is kicked with a speed of 9.95m/s at an angle of 35.0∘ above the horizontal.If the ball lands at the same level from which it was kicked, how long was it in the air?
*June 4, 2014*

**helppppp math helppp!**

292,559
*June 1, 2014*

**Physics**

A batter hits a ball and it is caught 4 seconds later 100 meters from home plate. What is the initial velocity of the ball?
*May 28, 2014*

**Math: Linear Equation**

thank you so much!!
*May 20, 2014*

**Math: Linear Equation**

An assignment with 3 of these problems was assigned to my class and we haven't learned it yet. I don't know when our professor plans on covering it but I'd like to finish my homework.
*May 20, 2014*

**Math: Linear Equation **

I have not learned this yet in class and I am stuck on this homework problem. Graph the linear equation by using a table of solutions. 3x-4y=12
*May 20, 2014*

**chemisty**

calculate the H+ for green tea with a pH of 7.9
*May 14, 2014*

**chemistry**

calculate the mass percent of the following solutions 1.25 g CaCL2 in 35.0 g H2O I am not sure if i have the correct set up (1.25g CaCl2/1.25 g CaCl2 + 35.0 g H20)*100
*May 14, 2014*

**college chemistry**

if 75 g of ice at 0.0 degrees C were added to 1.5 L of water at 75 degrees C what would be the final temperature of the mixture
*May 13, 2014*

**chemistry**

I got the molecular formula is NaHCO3+H2SO4=Na2SO4+CO2+H2CO3 and i got the total ionic formula is NaOH+H2CO2(aq)= Na2CO3 + HOH but i am having trouble finding the net ionic formula can you please help me thank you
*May 13, 2014*

**Catering**

Guidelines to formal etiquette quite clearly stipulate that? A. corn on the cob should be eaten with a knife and fork. B. asparagus spears should be eaten with the fingers. C. eating a canapé directly from a server's tray is permissible. D. bread should always be ...
*May 6, 2014*

**Chemistry**

If you dissolve 13.5 g of malic acid, C4H6O5, in half a liter of water (0.500 L), what is the molarity of the acid in the solution?
*May 4, 2014*

**Accounting Questions**

Ugh. This class. Does anyone have the answers?
*May 3, 2014*

**chem**

calculate the density of each of the following gases: a)NH3 at 25 Degrees Celsius and 1.2 atm b)Ar at 75 Degrees Celsius and 745 torr
*April 29, 2014*

**college chem**

A mixture contains H2 at 600 torr pressure, N2 at 200 torr pressure and O2 at 300 pressure. what is the total pressure of the gases in the system?
*April 29, 2014*

**Engineering**

Three resistors , 50 ohms, 100 ohms, and r3 are connected in a series to a power source with potential difference 48 volts and a current throughout the circuit. Can anyone help me figure out what r3 is ?
*April 29, 2014*

**college chem**

A sample of O2 gas was collected over water at 23 degrees celsius and 772 torr. what is the partial pressure of the O2?
*April 29, 2014*

**college chem**

a sample of a gas occupies a volume of 1025 mL at 75 degrees Celsius and 0.75 atm. What will be the new volume if temperature decreases to 35 degrees Celsius and pressure increases to 1.25 atm
*April 29, 2014*

**college chem**

A sample of methane gas CH4, occupies a volume (L) of 58.2 L at a pressure of 7.25 atm. What volume will the gas occupy if the pressure is lowered to 2.03 atm
*April 29, 2014*

**pipe fitter test certification**

Please Help!...I am in need of a study guide for my pipefitters test, or an outline of what's on the test. Unfortunately I am not able to take the class available. PLEASE if you know of one or where one would be available. Any information will be greatly appreciated and a ...
*April 28, 2014*

**Chemistry**

What is the specific heat of an unknown substance if a 2.45g samples releases 12.9 cal as its temperature changes from 25.1 degrees C to 20.1 degrees C?
*April 27, 2014*

**Language Arts**

That is correct
*April 21, 2014*

**HELP!**

Need some help with the 6:3:1 ratio question. Don't understand.
*April 14, 2014*

**math**

Houston Community College is planning to construct a rectangular parking lot on land bordered on one side by a highway. The plan is to use 640 ft of fencing to fence off the other three sides. What should the dimensions of the lot be if the enclosed area is to be a maximum?
*April 14, 2014*

**Math**

A=?, b= 12 mm, h= 7.5 mm
*April 10, 2014*

**Chemistry help plzzzzz!!!!! **

I've tried solving this problem 100x and i keep getting it wrong. I dont know where i am going wrong. Wouldnt it be: (100ml * 4.180 * 6.49) + (6.50*6.49) 2713+42.2=2755.2= 2755.2/0.05=55104 Then convert to kj so 55104/1000=55.104 which would be 55.1 for correct sig digits...
*April 10, 2014*

**Spanish 101**

Choose the logical word or words to complete each sentence. 1. A mis hermanos y a mí nos____ aprender verbos nuevos. 1 encanta 2 encantamos 3 encanto 4 encantan I chose answer 2 ecantamos 2. A mi papá ____ molestan los niños traviesos. 1 los 2 me 3 se 4 le...
*April 2, 2014*

**Math**

Thank you so much for the help!
*April 2, 2014*

**Math**

This problem from China is almost 2000 years old: Find a number that when divided by 3 gives a remainder of 2, when divided by 5 gives a remainder of 3, and when divided by 7 gives a remainder of 4.
*April 2, 2014*

**math**

Use each clue to find a three digit number
*March 31, 2014*

**statistics**

In a statistics class of 45 students, 12 have a strong intrest in statistics. If two students are selected at random from this class, what is the propability that both of them have a strong interest in statisitcs?
*March 31, 2014*

**health**

It is D. None of the above All the statements sound correct but have incorrect descriptions. DCM is not a program and the description for it is actually CBT. DBT is not collaborative care management. Additionally, I have completed that particular Exam and received 100 pts.
*March 29, 2014*

**algebra 1**

Does anyone know this question?
*March 20, 2014*

**CHEMISTRY**

An electron undergoes a transition from an n=3 to an n=1 stationary state and red light is released. Which of the following forms of electromagnetic radiation could be released for an n=2 to n=1 electron transition within the same atom? -blue visible light -yellow visible ...
*March 20, 2014*

**Chemistry**

heather is incorrect
*March 18, 2014*

**physical science**

Green light has a frequency of about 5.3Hz~10Green light has a frequency of about 5.3Hz~ 10^{14}. Using the relationship speed of light (c)=fƒÉ find its wavelength in air.
*March 17, 2014*

**physics**

In I2 you halfed the radius of the flat disk as if it were a diameter like pottery wheel. it's not 0.065 it's 0.13
*March 17, 2014*

**Science**

b I had the same question
*March 16, 2014*

**algebra**

What is the slope of the line 4x + 6y = 12
*March 13, 2014*

**Math **

jared's football team lost a total of 12 yards during 4 plays of the game. They lost the same number of yards during each of the plays. What is an integer to represent it?
*March 11, 2014*

**Math**

A MP3 player is marked up by 10% and then marked down by 10% what is the final price?
*March 5, 2014*

**Science**

What is true about X-rays and microwaves? (1 point) a. X-rays have greater speed than microwaves. b. X-rays have greater amplitude than microwaves. c. X-rays have greater frequency than microwaves. d. X-rays have greater wavelength than microwaves.
*March 5, 2014*

**Science**

I think it's a. X-rays
*March 5, 2014*

**Science**

2. Which waves have the longest wavelength and lowest energy on the electromagnetic spectrum? (1 point) a. X-rays b. infrared c. radio waves d. gamma rays
*March 5, 2014*

**Science**

Is there any way I can attach the picture?
*March 5, 2014*

**Science**

1. Compare the two light waves above. Which wave would produce the brightest light and which wave would have the least energy? (1 point) a. wave A; wave A b. wave A; wave B c. wave B; wave A d. wave B; wave B Is it C?
*March 5, 2014*

**Math 30-2**

There are 7 different books on a shelf. How many selections of more than 4 books can be made?
*February 28, 2014*

**Stats**

In 1898 L. J. Bortkiewicz published a book entitled The Law of Small Numbers. He used data collected over 20 years to show that the number of soldiers killed by horse kicks each year in each corps in the Prussian cavalry followed a Poisson distribution with a mean of 0.63. (a...
*February 25, 2014*

**Stats**

The number of failures of a testing instrument from contamination particles on the product is a Poisson random variable with a mean of 0.028 failure per hour. (a) What is the probability that the instrument does not fail in an 8-hour shift? (b) What is the probability of at ...
*February 25, 2014*

**math**

$155.5 how I found it: I tried to find what an amount for which to total amount of tax cost $9.33 so, I chose random numbers to test this, 155.5x.06=9.33
*February 25, 2014*

**Statistics**

Astronomers treat the number of stars in a given volume of space as a Poisson random variable. The density in the Milky Way Galaxy in the vicinity of our solar system is one star per 16 cubic light years. (a) What is the probability of three or more stars in 16 cubic light ...
*February 20, 2014*

**Statistics**

An electronic product contains 32 integrated circuits. The probability that any integrated circuit is defective is 0.02, and the integrated circuits are independent. The product operates only if there are no defective integrated circuits. What is the probability that the ...
*February 20, 2014*

**maths**

my number is less than 100 one more than a multiple of 3 one of its digits is prime if you reverse its digits you get a prime it has exactly four factors the sum of digits is prime if you miltiply it by 5 it is greater than 100
*February 19, 2014*

**Math**

a^2+b^2=c^2 a=24 b=25 c= squareroot(24^2+25^2)=34.6554469
*February 18, 2014*

**math**

Thank you
*February 18, 2014*

**math**

how did you get .1?
*February 18, 2014*

**math**

The probability that Jack plays guitar on a raining day is 0.6 and on a sunny day is 0.5. The probability that is rains tomorrow is 0.8. Find the probability that Jack will not play guitar tomorrow? Is it 32%?
*February 18, 2014*

**algebra 2**

X^2-4x-3.5=0 x=(-b+ or - squareroot(b^2-4ac))/2a x= (4+ or - squareroot((-4)^2-4(1)(-3.5)))/2 x=(4+ squareroot(30))/2 x=(4- squareroot(30))/2 x=4.738612788 x=-.7386127875
*February 18, 2014*

**algebra2**

4(x-1)(x-1)+3 4(x^2-2x+1)+3 4x^2-8x+4+3 4x^2-8x+7
*February 18, 2014*

**Statistics**

Disk of ploycarbonate plastic form a supplier are anaylzed for scratcha nd shock resistance. the results from 100 disks are summarized below: Shock Resistance high low Scratch high 70 9 resistance low 16 5 Let A denote the even that a disk has high shock resistance, and let B ...
*February 18, 2014*

**Statistics**

The probability that Jack plays guitar on a raining day is 0.6 and on a sunny day is 0.5. The probability that is rains tomorrow is 0.8. Find the probability that Jack will not play guitar tomorrow? Is it 32%?
*February 18, 2014*