Friday
December 9, 2016

Posts by DAVID

Total # Posts: 2,182

chemistry
how many moles are released when 13.2 g of ammonium sulfate 2NH4SO4 is dissolved in water ? I know 13.2 g 2NH4SO4 = .099 moles
December 8, 2016

Physics
How many kilograms of water can be evaporated at 100 degrees Celsius by the combustion of 470 litres of fuel oil whose heat of combustion is 37 MJ/Litre
December 8, 2016

Algebra 2(help please!!)
Divide 7 by 20 and it will give you your percentage.
December 7, 2016

Math
All of the following statement are true about factors EXCEPT: Complexity, Miniaturization, and productivity are examples of adjustment factors. A cost factor is a cost estimating relationship, where the dependent variable is not directly proportional to the independent ...
December 7, 2016

Language arts
What is The propositional phrase of this sentence.The ticket holders waited patiently (outside the movie theater).
December 6, 2016

Algebra
Find approximate solutions rounded to three decimal places for ?f(x)=x^2-5x+3
December 6, 2016

Algebra
Find the first 4 terms of the recursively defined sequence. a subscript 1 =9?, a subscript 2 =9?, a Subscript n+1=a Subscript n +a Subscript n-1 Are the first four terms A)9,9,18,18 B)9,9,9,27 C)9,9,81,729 D)9,9,18,27
December 6, 2016

PHYSICS HELP
Two identical gas cylinders each contain 20.0 kg of compresses air at 1.00 x 106 pa and 275 K. One of the cylinders if fitted with a safety valve that releases air into the atmosphere if and only if the pressure in the cylinders raises above 1.10 x106 pa (the other cylinder ...
December 4, 2016

physics (urgent)
Two identical gas cylinders each contain 20.0 kg of compresses air at 1.00 x 106 pa and 275 K. One of the cylinders if fitted with a safety valve that releases air into the atmosphere if and only if the pressure in the cylinders raises above 1.10 x106 pa (the other cylinder ...
December 4, 2016

English
Hey there! I think that you are right. The second sentence is missing the article 'the'
December 3, 2016

math
How many boys there are in the group that wears glasses over the total number of people that wear glasses. Remember to simplify.
December 2, 2016

social studies
What choice do you think the answer is?
November 30, 2016

social studies - WW1
The Central Powers were Germany and Austria-Hungary. Neutral nations that joined them were Bulgaria and the Ottoman Empire. The Allies were the United Kingdom, France, Serbia, and Russia. The neutral nations that joined them were Portugal, Italy, Belgium, Romania, and Greece. ...
November 30, 2016

social studies
That is correct.
November 30, 2016

Math
Well, consider the multiples: [6, 12, 18, 24, 30, 36, 42, 48, 54, 60, ...] Eventually, you run into repeating digits in the one's place. You should be able to figure it out from there.
November 30, 2016

physic
Electrical energy is really the effect of moving electrical charges from one point to another in a conductor. Electrical charges moving through a conductor is called electricity. Electrical energy may be easily changed into other forms of energy to suit our particular needs. ...
November 30, 2016

Math Check
1. You're correct, because the decimal repeats digits, it's considered rational. 2. I believe that's correct. It doesn't come out to 160ft^2, of course, but it's sure close at least. 3. This is false, actually. Rationals and Irrationals form their own ...
November 30, 2016

computer programming
You might be able to find some relevant information on somewhere like Stack Overflow.
November 30, 2016

Algebra
Make an equation out of the information given. You're going to have one of those values above set equal to an equation with a variable and you want to see how large you can make that variable without going above the constant you've set your equation to: y = ax + b That...
November 30, 2016

Math: Creating a linear equation
Is this question based off another that has already been posted? Regardless, with the information given, you cannot give the answer in a completely linear form because $141 is only a constant (as denoted by "as a one-time payment") Your equation would then be: cost...
November 30, 2016

order pair and relations
What are the multiples of thirty-six?
November 30, 2016

Science
"Hypo to Hyper, like a windshield wiper!" That's how I learned it. Everybody likes homeostasis, so when you have an imbalance like too much sugar outside a cell (or in this case, a grape), it will take responsibility and try to fix things by rebalancing the ...
November 30, 2016

Math
You have the [3 x $44.12] correct but for the [$0.44], it's not as simple as just adding the amount once. "Per mile" is your clue here.
November 30, 2016

Math
What equation did you come up with, or rather, how did you go about trying to solve it.
November 30, 2016

Math
Alright, it's the same idea, make an equation out of the information just like the first question I helped you with.
November 30, 2016

Math
"plus mile" is really ambiguous. Otherwise, all that you need to multiply the cost per day by the number of days the car was rented for.
November 30, 2016

Math
That is correct!
November 30, 2016

Math
Make an equation out of it: y = the total cost of the bill. y = (6 x $1.15) + $3.75 + $7.45 + (13 x $1.15) + (3 x $37.00) Do the math and you'll have your answer.
November 30, 2016

social studies
Ms. Sue is correct. It was nowhere near completion within Qin Shi Huang's lifetime. It was certainly a long-term project.
November 30, 2016

social studies
The history of the Great Wall of China began when fortifications built by various states during the Spring and Autumn (771–476 BCE) and the Warring States periods (475–221 BCE) were connected by the first emperor of China, Qin Shi Huang, to protect his newly founded ...
November 30, 2016

Math: Creating a linear equation
Well, let's consider each piece we're given: $50 as a down payment for accepting the job -> This value doesn't change regardless of how many Alex would work on the job. He would get the money ahead of time, meaning that the value is constant and would fit ...
November 30, 2016

Math
28 yards x L = 2996 yards squared; solve for L; Every 1 square yard = 9 square feet. 2996 x 9 = ?
November 30, 2016

Science
Do you know what the Integumentary System is?
November 30, 2016

math
You can do this by subtracting four from twenty-four and count how many times you can do this before you get to zero. 24 - 4 = 20; // 1 20 - 4 = 16; // 2 16 - 4 = 12; // 3 12 - 4 = 8; // 4 8 - 4 = 4; // 5 4 - 4 = 0; // 6 So, four can go into twenty-four six times.
November 30, 2016

Absolute value statement
Not quite, either the absolute value of a negative number is the positive version of that number. So, |-7| is 7.
November 29, 2016

Absolute value statement
[0 - 7] is not [-6]. Otherwise, you are correct so far.
November 29, 2016

Math
Multiply 20 and 1.75. That will be your answer.
November 29, 2016

Inequality 6 grade math help
You need a negative sign on the seven and the zero should probably be replaced with some kind of variable, usually "X".
November 29, 2016

chemistry
Bromine and Chlorine react to form Bromine monochloride. Bromine and Chloride are both diatomics so, in their elemental forms, they have two atoms. _Br2 + _Cl2 -> _BrCl Fill in the blanks.
November 29, 2016

Math
1. Convert the two functions so that they have common denominators. 2. Add the two fractions. 3. Subtract the sum of the two fractions from one, (preferably the fractional form of one derived from the step one.) 4. Simplify, if possible.
November 29, 2016

Social Studies
Apologies, Ms. Sue, I hadn't realized you posted as I was making my explanation. I'll try not to provide the answer so blatantly as well. Still trying to get the hang of it.
November 29, 2016

precalculus
You can solve for each variable (a, b, c) through forming a system of equations with each set of coordinates. You should have three equations after plugging in. 1. Plug in the coordinates for x and y into the general form. Remember y and f(x) represent the same quantity. 2. ...
November 29, 2016

AP Chemistry
The rate constant for the equation, 2C2F4 ? C4F8, is 0.05 M^?1· s^?1. We start with 0.111 mol C2F4 in a 3.00-liter container, with no C4F8 initially present. What will be the concentration of C2F4 after 1.00 hour? Answer in units of M.
November 29, 2016

Writing help
do you still need the help with your assignment? One of the easiest ways to help others is to simply share your knowledge. You don’t have to be in front of a classroom to teach. Every day there is an opportunity to educate someone about your area of expertise. The key is ...
November 29, 2016

Chemistry
Ammonium nitrate a common fertilizer was used by terrorists in the trgic explosion in oklahoma city in 1995.how many litres of gas at 307oc and 1.00atm are formed by the explosive decomposition of 15kg of ammonium nitrate to nitrogen, oxygen and water vapour Solution 2NH4NO3=...
November 29, 2016

Physics
This problem seems like it can be treated almost like a math problem. We know that one kilogram is equal to one-thousand grams and that one slice of ham is seven grams and two slices of bread are fifty grams total (twenty-five grams each). So you just need to see how many ...
November 28, 2016

Physics
We want to find which of these two elements is our limiting amount. Here's some helpful equations to consider. 8x = 32 //The equation for oxygen. 1x = 9 //The equation for hydrogen. From these two values, we want to determine the value of x that makes each equation true. ...
November 28, 2016

Math
// Original equation. (-i) - 2 - (6 - 4i) - (5 - 2i) // Distribute negatives. -i - 2 - 6 + 4i - 5 + 2i // Combine like terms. ((-2) + (-6) + (-5)) + ((-i) + 4i + 2i) // Solve. (-13) + 5i // Answer. 5i - 13
November 28, 2016

Social Studies
Oh, alright!
November 28, 2016

Social Studies
Yeah, that's the source I got the info from but when I tried to post the link, it told me I couldn't! Hope it was helpful, though!
November 28, 2016

Social Studies
McClellan ably built the army in the early stages of the war but was a sluggish and paranoid field commander who seemed unable to muster the courage to aggressively engage Confederate General Robert E. Lee's Army of Northern Virginia. So, actually, no. He wasn't ...
November 28, 2016

math
// FACTOR BREAKDOWN 81 = 3 x 3 x 3 x 3 27 = 3 x 3 x 3 a^3 = a x a x a a^2 = a x a b^3 = b x b x b b^2 = b x b /* For LCM, we want to consider the most number of times any digit or variable appears in the factorization. Comparing 81 and 27, we see that the number three shows up...
November 28, 2016

science
A steel rod of length 60 cm and radius 2.5 mm hangs vertically. If a mass of 2.5 kg is attached to the end of the rod, calculate the increase in the length of the rod
November 28, 2016

English
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November 23, 2016

Chemistry 20
a source of hydrogen is an important issue of hydrogen fuel cells are going to become useful in automobiles. What important perspective is missing?
November 21, 2016

Chemistry 20
If 4.56 mol of zinc react with excess copper (ii) sulphate, how many moles of precipitate will be formed?
November 21, 2016

Math
What is 100,000,000,000,000 times 999,999,999,999?
November 17, 2016

English
Is there no topic? You may come up about the story of the lost kid in the bus. Sorry,I am not that creative that is why I better go to the writers from Marvelous essay service and let them do that job for me. At least, I am sure about the high grade
November 17, 2016

Building services
Principles of heat: How many kilograms of water can be evaporated at 100 degrees Celsius by the combustion of 470 litres of fuel oil whose heat of combustion is 37 MJ/Litre
November 15, 2016

Math!!!
really have no clue
November 14, 2016

Math!!!
There are some hats in a box.1/6 of them are red, 1/3 are blue, and 3/7 of the remainder are green. If there are 27 green hats, how many hats are there altogether?
November 14, 2016

Math !!!
15/30 of the savings is left
November 14, 2016

Math !!!
Kieth spends 1/6 of his savings on a magazine and 2/5 of the remainder on a book. What fraction of his savings is left?
November 14, 2016

Math !!!
Tony is given 9/10 hour to mow a lawn. He only uses 2/3 of the given time to mow the lawn. How much time is left?
November 14, 2016

Math !!!
Tian has 56 paper clips. He gives 3/4 of them to Joe. Joe gives 2/7 of what he receives to Rahul. How many paper clips does Rahul get?
November 14, 2016

Math
A child releases a balloon from a height of 6ft and it ascends at a rate of 5ft per second. A second balloon starts at a height of 51 ft and descends at a rate of 2 ft per second. After how many seconds will both balloons be at the same height above the ground.
November 13, 2016

Algebra
Thank you for your help.
November 13, 2016

Algebra
A tank contains 150 gallons of water and fills at a rate of 8 gallons per minute. A second tank contains 600 gallons of water and drains at a rate of 10 gallons per minute. After how many minutes will both tanks have the same amount of water?
November 13, 2016

Algebra
Thank you
November 13, 2016

Algebra
A child releases a balloon from a height of 6ft and it ascends at a rate of 5ft per second. A second balloon starts at a height of 51ft and ascends at a rate of 2ft per second. After how many seconds will both balloons be at the same height above the ground?
November 13, 2016

Math
At the market, 0.2 of the pieces of fruit are peaches, 0.25 is apples, 0.05 is lemons, 0.1 is cherries, 0.2 is grapes, and 0.15 is plums. There are also 8 pineapples and 4 mangos. How many peaches are for sale at the market? How many apples? How many lemons? How many plums?
November 12, 2016

Math
One-quarter of Steve's baseball cards are from his dad's collection. Another 0.2 are from his uncle, and 0.5 are from his brother. The rest are from Steve's cousin. Thirty of the cards from his cousin are National League players; the other half are American League...
November 12, 2016

Math
How could Jason solve for T in this equation? T - 8 = 40 A) add 8 to the left side B) add 8 to the left side and subtract 8 from the right side C) add 8 to each side D) divide each side by 8
November 12, 2016

Math
What should Edna do to solve for m in the equation? 65 = m + 29 A) add 29 to each side B) add 29 to the left side C) subtract 29 from the right side D) subtract 29 from each side
November 12, 2016

Math
In a class where there are as many girls as boys, 2/5 of the boys and 1/2 of the girls went to a local fair. What fraction of the students in the class did not go to the local fair?
November 12, 2016

Math
Alvin has some marbles in a box. He keeps 1/3 of them and gives the remainder to Joyce and Sean. Joyce gets 5/8 of the remainder. What fraction of the marbles does Sean get?
November 12, 2016

Science
I may advise you where to go to have the report and coclusion written. The writers from Marvelous essay service help me all the time and I want you to have your work done by them. I am sure that you will be satisified
November 11, 2016

Math
Find the sum of each series by using appropriate formulas. Show your work. MY WORK: (N is the last number in the sequence) 1+2+3+...+230 n(n+1)/(1*2) 4+8+12+...+360 n(n+4)/)4*2) 1+3+5+...+123 ((n+1)/2))^2 The problem: 53+59+65+...+233 n(n+6)/(6*2) 233(239)/12 = decimal??? ...
November 10, 2016

Physics 1
a 12.5 m long string vibrates as 100 hertz standing wave with nodes at 1.0m and 1.5m from one end of the string and at no points in between the two. Which harmonic is this? What is the string's fundamental frequency?
November 2, 2016

AP Cemistry
Calculate the heat that must be supplied to 10.5 g of Ne(g) at 0.15 atm to raise its temperature from 24◦C to 54◦C at constant pressure. Assume that neon behaves as an ideal gas. Answer in units of J. [So, I know that we would use q = mCDT at some point but because...
October 28, 2016

math
Was this perhaps a typo? Did you mean that Aaron split TEN pencils between seven people? It wouldn't make sense for Aaron to break a pencil into seven chunks and hand them out to his friends.
October 27, 2016

math
This is a simple division problem with an expected remainder: 82 / 7 = 11 boxes + 5 crackers leftover. We can't expect a decimal in this sort of problem so we consider how many 7's can FULLY go into 82 and then subtract that total when no more 7's fit. So, 82 ...
October 27, 2016

physics
Please refer to my post on your earlier question.
October 27, 2016

English
"Look at this picture of John." and "Look at this picture of John's." are both correctly written sentence. The first implies that the picture has John on it. It was a picture taken of him. The second sentence implies possession. The picture belongs to ...
October 27, 2016

physics
Considering that the speeds are in two different units, we have to convert. The conversion rate from km/h to m/s is 1 to 0.277778. So the car's speed is 15 m/s. The distance between the car and the truck is 60000 m. This problem can be solved using a system of equations. ...
October 27, 2016

Math
Assuming that the goal here is to just solve for each variable, this goes back to basic algebra and it's highly suggested that you refer to your notes. Regardless, SOLVING FOR Z ORIGINAL EQUATION: (z / 12) = 9 (1/12) * z = 9 //A variable divided by anything can be replaced...
October 27, 2016

Algebra
This problem works off of the relationship between two equations. In this case, the equations represent the two offered fitness plans. We will start by setting up our two equations: y = 30x + 50 y = 40x Our goal is to find when the first option will come out to be better in ...
October 26, 2016

Math
Is the number of total shots Ryan made a given? Otherwise, there is no way to figure this out. In any case, if we know that Ryan made 60% of all shots he made, that must mean that the other 40% of shots he made were foul (assuming that this means "missed shots"). All...
October 26, 2016

AP Chemistry
So my work then came out to be this, but proved to be wrong. //Chemical Equation CH4(g) + 202(g) = CO2(g) + 2H20(l) //Gallons -> Liters 94 x 3.785 = 355.79 //Liters -> Mililiters 355.79 * 1000 = 355790 //Mililiters -> Grams (Density) a = 355790g H2O //Delta ...
October 26, 2016

AP Chemistry
A typical bathtub can hold 94 gallons of water. Calculate the mass of natural gas that would need to be burned to heat the water for a tub of this size from 59 ◦F to 101 ◦F. Assume that the natural gas is pure methane (CH4) and that the products of combustion are ...
October 26, 2016

algebra
To find the distance between two points (x1, y1) and (x2, y2), all that you need to do is use the coordinates of these ordered pairs and apply the formula: Distance = √((x2 − x1)^2 + (y2 − y1)^2) So, in using this formula, we find that: 1. The distance ...
October 26, 2016

Science
An astronomical unit is a unit of measurement equal to 149.6 million kilometers, the mean (average) distance from the center of the earth to the center of the sun.
October 26, 2016

math
The parabola whose equation is 4y^2+3x=2+8y, determine the co-ordinates of the focus, equation of the directrix and the length of the latus rectum?
October 24, 2016

Algebra
Country A has a growth rate of 4.7% per year. The population is currently 5,646​,000 and the land area of Country A is 13​,000,000,000 square yards. Assuming this growth rate continues and is​ exponential, after how long will there be one person for every ...
October 22, 2016

Math
A rectangle, a circle and a triangle are drawn in a plane. What is the maximum number possible points of intersection. The sides of the triangle are not collinear with any of the sides of the rectangle.
October 20, 2016

Algebra
Country A has a growth rate of 2.6% per year. The population is currently 4,069​,000 and the land area of Country A is 33​,000,000,000 square yards. Assuming this growth rate continues and is​ exponential, after how long will there be one person for every ...
October 20, 2016

Math
Find two algebraic expressions for the area of each figure. First, regard the figure as one large rectangle, and then regard the figure the figure as a sum of four smaller rectangles t,5,t,3
October 12, 2016

History
Thank you so much! I'm behind a lot in World History.
October 10, 2016

Math
What is the equivalent ratio in simplest form of 45 books in 90 minutes if she organized 120 books.
October 5, 2016

Science, NATS
Consider the following chemical reaction. Molecular hydrogen and carbon dioxide react to form water and methane. H2+CO2-->H2O+CH4 A)Explain why this equation is not balanced and what law of nature does it break in its current form? B) Astronauts from the Earth carry large ...
October 1, 2016

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