Posts by Jay

Total # Posts: 1,692

Chemistry
How much energy in KJ is release to form one mole of 123Sb from protons and neutrons if the atom has a mass of 122.90422 amu? Please remember to include the mass of electrons in calculations.

Chemistry
A rock containing 238U and 206Pb was examined to determine its appropriate age. The molar ratio of 206Pb to 238U was 0.1462. Assuming no lead was originally present and that all lead formed remained in the rock. What is the age of the rock in years? The half life of 238U is 4....

Statistics
Hi I am a college student in wireless technology but am only very sketchy on statistics. I'm am trying to write a program to tell me if activity is unusual. I can read the activity of a person from a motion detector from day to day i.e. mon activity - 250 times tues - 300 ...

geometry
Jackson is creating a water garden surrounded by a triangular patch of grass. If the pond will take up the space indicated by the circle, how many square feet of sod will he need to complete the garden (use 3.14 for and round your answer up to the next foot)?

math
16 = 16x^2 - 64x + 64 0 = 16x^2 - 64x + 64 - 16 (using quadratic formula) x= 3 or x =1

Math
Anyone help?

Math
What other post?

Math
Can someone guide me with this question? Four teachers and five students have volunteered to serve on the school's fundraising committee, which is chaired by the principal. The principal wishes to select the committee using a random draw. He places each person's name ...

Math
Should I create a grid 6 by 5? :S

Math
faizel wants to travel from his house to the hardware store that is six blocks east and five blocks south of his home. If he walks east and south, how many different different routes can he follow from his house to the store? Can somebody help me setup this question? I don'...

Math
Find the instantaneous rate of change for the function at the given value. f(x)=x^2+2x at x=-4

Math
Using the arrangement of letters in the margin, compute the number of paths that spell the word MATHEMATICS if all paths must start at the top and move diagonally down through the letters. M A A T T T H H H H E E E M M M M A A A T T I I I C C S I only got up to E E E, I don&#...

Calculus
Could someone work this out so I understand it. Thanks Given the supply function p=S(x)=5(e^0.02x-1) Find the average price (in dollars)over the supply interval [31,36] The 0.02x in the only thing ^ on the e

History

world history
The Europeans desire for profit affected the people of Congo by taking away their freedom, forcing them into slavery, taking away their customs, affected the economy etc.

Chemistry
The vapor pressure of water at 95C is normally 6.33.9 but decreased to 561.2mmHg upon addition of an unknown amount of NaOCl to 164.3g of water at this temp. How many grams of NaOCl was added assuming complete dissociation of the solute

Chemistry
I followed this procedure but i was told the answer was incorrect. Any help would be appreciated.

Chemistry
Oh just kidding after much frustration and stepping away from the problem and coming back, I noticed that I messed up the density in my conversion. I had the right idea I just had to correct my mistake and then continue on with the molar mass of CaF2, then I divided 4 ...

Chemistry
Calcium fluoride is the well-known mineral fluorite. It is known that each unit cell contains four Ca2+ ions and eight F- ions and that the Ca2+ are arranged in a face-centered cubic lattice. The F- ions fill all the tetrahedral holes. The edge of the CaF2 unit cell is 5.46295...

Math
Can someone help me verify if this is correct? Gasoline usage for compact cars in Canada is a normal distribution with a mean of 33.3 km/l and with standard deviation of 7.3 km/L. Round your answers to one decimal place. a) What percentage of compact cars obtains 20km/L or ...

Math
anyone?

Math
Can someone help me verify if this is correct? Gasoline usage for compact cars in Canada is a normal distribution with a mean of 33.3 km/l and with standard deviation of 7.3 km/L. Round your answers to one decimal place. a) What percentage of compact cars obtains 20km/L or ...

Math
She added 4, multiplied the sum by -5, and subtracted 12. She then doubled the result and got -34. What number did Christa started with?

social studies
what was one of the increased use of the assembly line in the 1920's?

geography
what would happen if wheat was no longer a resource to the U.S.?

Physics
A 7.80-g bullet moving at 590 m/s penetrates a tree trunk to a depth of 4.8 cm. Assuming the friction force is constant, determine how much time elapses between the moment the bullet enters the tree and the moment it stops moving.

chemistry
for an exotherimic reaction incresing the reaction temperature results in a (n)___k ?

chemistry
given reaction at equilibrium, if Kp=1.05 at 250 degree celcius, then kc =

algebra
8000, because 1m=100cm. You take the 100m/5cm=20 cubes. V=LxWxH. 20x20=400x20=8000

chem
how many moles of NaOH are needed to neutralize 50.0 Ml 0f ).242 M H2SO4 solution ?

physics
The engine weighs 4500 newtons and it is lifted 1.5 meters up by the block and tackle system. The mechanic must apply a force of 225 newtons while pulling a total of 37.5 meters of chain through the block and tackle pulley system. What is the work done by the block and tackle ...

Physics
.455

Geometry
(20^2-7^2) = 351 sqrt of 351 = 18.7

Geometry
Find the length of the altitude of an isosceles triangle if one side has a length of 20 ft and a base of 14 ft?

English
Yeah but the entire essay is a narration, and in my question I had to pick out the thesis for both Frazier and his narrator. So I had to find in the essay where Frazier interjects his own thesis.

English
I am between two different thesis statements for Frazier either it is where the writing becomes italicized, "Remember to keep shower curtain inside tub at all times!" Or In the last paragraph from Operating the shower curtain is kind of tricky to there is no need ...

English
Within this I have another question. I am between two different thesis statements for Frazier either it is where the writing becomes italicized, "Remember to keep shower curtain inside tub at all times!" Or In the last paragraph from Operating the shower curtain is ...

English
Help! In Ian Frazier's essay How to Operate the Shower Curtain, what problems are users likely to encounter in using the shower curtain?

Physics
An electron is accelerated through 2200 V from rest and then enters a region where there is a uniform 1.30 T magnetic field directed perpendicularly to the electron's velocity.

math
6 + 3

math
A computer technician charges \$40 for a house call and \$38 per hour. The expression 40 + 38t is used to find the cost of a house call that lasts t hours. What is the cost of a house call that last 3 hours?

math
A phone compant uses the expression 1.25 + 0.10m to calculate the cost of a phone call that lasts m minutes. What is the cost of a call that last 20 minutes?

2 and 3 are right. the first one is a trick question. It is a circle, so the tangent line is always 90 degrees to the radius

Algebra
Factor 2xsquared minus 5x minus 3.

Thank you, my understanding of when or where to use Ms. was wrong.

5: You are attending a professional conference and are privileged to be introduced to Caroline Peters. You know nothing about her except that she is an executive at a very successful company. You have and idea that you would like to talk over with her. How should you address ...

algebra
solve using the elimination method x+7y=58 -x+4y=30

English
Please find errors and correct them. To all ABC Internet Customers we have resolved the problem we were having with the Internet backbone for Southern Illinois. There was an NAP connection that was having trouble in Atlanta, Georgia. This is been resolved. The speed is much ...

ENGLISH
I am confused as where to put the comma at that you stated in the first sentence.

the perimeter of a rectangle is 125cm. its length is 3x and its width is 2x. what is x.

math
how do i put that in a equation form?

math
The quotient of h and -6 is at least 5.

math
The product of a number and 7 in not less than 21.

math
tom saved \$550 to go on a school trip. the cost for a hotel room, including tax, is \$80 per night. write and inequality to show the number of nights tom can stay at the hotel.

math
dante has at most \$12 to spend on entertainment each week. so far this week, he spent \$7.50. Write and solve an inequality to determine how much money dante can spend on entertainment the rest of the week.

math
dante has at most \$12 to spend on entertainment each week. so far this week, he spent \$7.50. Write and solve an inequality to determine how much money dante can spend on entertainment the rest of the week.

math
the rope James bought with his camping gear is 54 inches long. james needs to cut shorter pieces of rope that are 18 inches long. what are the possible number of pieces james can cut?

math
the gas tank in bob's car holds at most 15 gallons. He has already filled the tank with 7 gallons of gas. he will continue to fill the tank with g gallons more. Write and solve an inequality that shows all the values of g that bob can add to the cars tank.

Chem
22.8 kg of a metal has a density of 8.3g/mL. Calculate the volume of the metal sample?

physics
sqrt(1/8)=ans

algebra
A peddler is taking eggs to market to sell. The eggs are in a cart that holds up to 500 eggs. If the eggs are removed from the cart 2, 3, 4, 5,or 6 at a time, one egg is always left over. If the eggs are removed 7 at a time, no eggs are left over. How many eggs are in the cart.

Stats
I Have no idea

math
Explain how you can multiply 3 times 24 by using arrays. Then give the product.

Algebra
What are the solutions of the quadratic equation below? 4x2 - 30x + 45 = 0

math
Ricky has a total of 64pennies and quarters in a jar.He has 34 more pennies than quarters.How much money does ricky have in the jar.

math
If Juan can consume in one sitting one medium (12-inch diameter), deep-dish (1-inch thick) pizza, what is the minimum volume of his stomach?

math
The year 1991 was the last year of the twentieth century whose number is a palindrome, that is, reads the same backward and forward. How many years between the years 2000 and 3000 will be palindromic?

geography
in which country khmer rouge establish a brutal regime?

physics
A pendulum bob is released from some initial height such that the speed of the bob at the bottom of the swing is 3.2 m/s. The acceleration of gravity is 9.81 m/s 2. What is the initial height of the bob?

algebra
In the lab, Jessica has two solutions that contain alcohol and is mixing them with each other. She uses times as much Solution A as Solution B. Solution A is alcohol and Solution B is alcohol. How many milliliters of Solution B does she use, if the resulting mixture has ...

math
mr.king, the owner of good morning groceries, wants to make a fence aea to put his carts in at night.he has 68 feet of fencing.what is the largest rectangular area he can fence? ( use only whole numbers)

physics
How fast (in rpm) must a centrifuge rotate if a particle 14.0 cm from the axis of rotation is to experience an acceleration of 70,000 g's?

physics
An electron and a proton are separated by 2.0 nm. (a) What is the magnitude of the force on the electron? (b) What is the net force on the system?

algebra
According to the world almanac, in 1990 there were 41,223,804 students enrolled in full-time day schools and there were 2,397,351 classroom teachers for these students. On average, how many pupils were there per teacher? Round answer to the nearest tenth.

Algebra
A revolving restaurant rotates one complete turn every 56 minutes. In the 21 minutes it takes to eat the peaches jubilee dessert, through how many degrees does the restaurant revolve?

match
the sum of two times a number and 5 is 11? equation form.

Just wanted to say thank you very much for your help to Writeacher. I made a 95 on my test. Thanks again.

Thank you so much. I greatly appreciate it.

Ok, here is my corrected answers. #3: A #4: A #8: D #9: B

I forgot the rest of the question on Num. 6. "Hush little baby," my grandfather would often whisper softly to me, "Don't say a word." ("Don't say a word." is underlined) thank you. I'm still thinking on the others.

I am just not sure about these questions. Any help is greatly appreciated. 1: Identify the sentence with correct subject-verb agreement. A: Although the trend is shifting, careers in science and technology continue to attract predominately men. B: Although the trend is ...

Algebra 2
The purity of gold is measured in karats. Twenty-four karat gold is pure gold and k karat gold is k/24 gold by mass. One piece of 16-karat gld jewelry has a mass of 30 grams and another piece of 10-karat gold jewelry has a mass of 40 grams. Find the number of grams in the ...

Algebra
What is the probability that a randomly selected three-digit number is divisible by 5? Express answer as a common fraction.

math
I need help with my math work

math
can some please solve everyone because i do get it. 102,105,111,114,120,123,129,_,_,_,_,_, 201,204,210,213,219

math
can some please solve everyone because i do get it. 102,105,111,114,120,123,129,_,_,_,_,_, 201,204,210,213,219

math
102,105,111,114,120,123,129,_,_,_,_,_, 201,204,210,213,219 is not +3+6+3+6 TRY it yourself

Math
+3+6 is wrong

Math
102,105,111,114,120,123,129,_,_,_,_,_, 201,204,210,213,219

math
the formula P= 2L+2W can be used to calculate the perimeter of a rectangle. A regtangular swimming pool has a length of 50 meters and a width of 25 meters. What is the perimeter of the swimming pool

Math
A farmer has some chickens and some goats. Altogher there are 43 heads and 108 legs. How many chickens does the farmer have? How many goats does the farmer have?

expository composition
write about what is friendship.why is frienship important

Pre-Calculus
O thanks for the tip. New here. Well and friend helped me figure out 1 and 2 since they were basically the same question. I found out that I had trouble actually doing the algebra once I had the equations. But I'm still a little confused on how to set up number 3.

Pre-Calculus
1.The angle of elevation to top of a building from a point on the ground 20degrees and the angle of elevation from a point to 25 feet farther away is 12degrees. Find the height of the building. 2.From a point on the ground, the angle of elevation to the top of a 60-ft radio ...

Conductivity
Thank gosh... herooooo.... I have no clue with these webwork question

Reaction Descriptions
Is AE correct?

cjs203 criminal justice
no becasue if you are an inmate you proved to the people that is above you (the officers)that you have no say so

math