Sunday

May 29, 2016
Total # Posts: 1,394

**Physical Science**

How much heat is necessary to change 305g of ice at -11c to water at 20c
*May 25, 2016*

**Chem**

A 175-g sample of water is saturated with KNO3 at 40ºC. What mass of KNO3 forms a precipitate if the solution is cooled to the freezing point of water? (Refer to the Solubility and Temperature graph.)
*May 24, 2016*

**World Geography**

During the late 18th and mid 19th centuries, Europeans and North Americans were attracted to nearby coastal waters due to potential economic gains from catching trout and cod fish*** catching seals and whales shipbuilding finding riches on unexplored islands
*May 4, 2016*

**math**

My teacher assigned us this problem: Using the following logarithms Log2,log3 and log10 solve for the log150,log 75 incorporating the properties of logarithms ,i tried ,but failed plz help!!
*May 2, 2016*

**quim**

A 453 K and 755 mm Hg , what volume of N2 completely react with 22.2 L H2 to produce NH3 ? N2 ( g ) + 3 H2 ( g ) -> 2 NH3 ( g ) I doubt if I use the ideal gas formula PV = nRT or another , but having only a pressure and a temperature which is not used because it is not what...
*April 11, 2016*

**quim **

A 453 K y 755 mm Hg, ¿qué volumen de N2 reaccionará completamente con 22.2 L H2 para producir NH3? N2(g) + 3 H2(g) --> 2 NH3(g) tengo la duda si uso la fórmula de gas ideal PV=nRT o alguna otra, pero al tener solo una presión y una ...
*April 10, 2016*

**Calculus**

Reverse the order of the double integral (y+1) dx dy, where -1<= y <= 4 and y - 4 <= x <= 4y-y^2
*April 8, 2016*

**Chemistry**

A sample has a molar mass of 162g/mol. When a sample of mass 0.385g was burned , 1.072g of CO2 ,0.307g H2O and 0.068g of nitrogen were produced. What is empirial and molecular formular of a sample . Write equation for combustion
*April 7, 2016*

**Chemistry**

A sample has a molar mass of 162g/mol. When a sample of mass 0.385g was burned , 1.072g of CO2 ,0.307g H2O and 0.068g of nitrogen were produced. What is empirial and molecular formular of a sample . Write equation for combustion
*April 6, 2016*

**Social Studies**

These answers are correct I am connexus for school and I just got 100℅
*March 30, 2016*

**Real Analysis (Math)**

Prove f(x) is discontinuous at 0 for the function f(x) = x if x>=0 and f(x) = 1 - x if x < 0 using the epsilon-delta method.
*March 30, 2016*

**Math**

Determine the value of c for the quadratic expression. X^2-14x+c
*March 23, 2016*

**Bus. **

Which one of the following statements describes the actions of an organization practicing TQM? A. Maximize ROI. B. Emphasize the short term. C. Make improvement goals easy and attainable. D. Make customer needs the highest priority
*March 19, 2016*

**Calculus (Line Integral)**

Let c be a curve w/parameterization r(t). show that the line integral of T dr equals the length of the curve where T is the unit tangent.
*March 18, 2016*

**Physics**

How do you determine the work done by the frictional force?
*March 16, 2016*

**Physics**

How can you figure out the work done by the frictional force if the friction is 80 Newtons against a horizontal force of 290 newtons. Is it simply subtracting 290 - 80 = 210?
*March 16, 2016*

**physics**

If I solved for centripetal acceleration how can you determine the magnitude of the force required to produce this centripetal acceleration? Next step please.... v=15m/s r=35m m=1300 kg 15 squared/35m=225/35= 6.43m/s squared
*March 16, 2016*

**Algebra**

Thank you!
*March 11, 2016*

**Algebra**

Suppose that the maximum weight that a certain type of rectangular beam can support varies inversely as its length and jointly as its width and the square of its height. Suppose also that a beam 6 inches wide, 2 inches high, and 12 feet long can support a maximum of 14 tons. ...
*March 11, 2016*

**Algebra**

Suppose that the maximum weight that a certain type of rectangular beam can support varies inversely as its length and jointly as its width and the square of its height. Suppose also that a beam 6 inches wide, 2 inches high, and 12 feet long can support a maximum of 14 tons. ...
*March 10, 2016*

**Discrete Math (function and similar triangles) **

I need to show that (0,1) and (10, infinity) have the same cardinality. Can I use similar triangles with open intervals? For example, I defined the open interval (10, infinity) to be on the positive x-axis and (0,1) to be on the positive y-axis. Then I said to pick any point ...
*March 4, 2016*

**Algebra**

The time it takes to cover the distance between two cities by car varies inversely with the speed of the car. The trip takes 15 hours for a car moving at 54 mph. What is the speed of a car that makes the trip in 27 hours?
*February 14, 2016*

**Physics**

Boyle's Law says that the volume of a gas varies inversely with the pressure. When the volume of a certain gas is 2 L, the pressure is 1065 kPa (kilopascals). What is the pressure when the volume is 15 L?
*February 8, 2016*

**Chemistry **

Boyle's Law says that the volume of a gas varies inversely with the pressure. When the volume of a certain gas is 2 L, the pressure is 1065 kPa (kilopascals). What is the pressure when the volume is 15 L ?
*February 8, 2016*

**Math**

A trapezoid has an area of 24 square meters. The lengths of the bases of the trapezoid are 5 meters and 7 meters. What is the height of the trapezoid? • 4 meters************ • 144 meters • 2 meters • 1 meter
*February 4, 2016*

**Math plz help one qustion only!!!!!!!!!!!!!!!!!!!!**

A trapezoid has an area of 24 square meters. The lengths of the bases of the trapezoid are 5 meters and 7 meters. What is the height of the trapezoid? • 4 meters************ • 144 meters • 2 meters • 1 meter
*February 4, 2016*

**Physics**

is the mechanical energy of a teflon coated block sliding down a rough incline remaining constant?
*January 25, 2016*

**math**

the price of lemonade went from .20 to .25 what is the percentage increase?
*January 14, 2016*

**gifted ELA**

Try doing Trixter's answers but in the opposite order like 12 is 1 and 11 is 2 etc...it might be legit
*December 5, 2015*

**gifted ELA**

Lol yeah those aren't right they don't make sense. Can someone give legit answers please?
*December 5, 2015*

**Maths**

€120 x .40 = 48 120 + 48 = 168
*November 18, 2015*

**Math**

A = 17500h B = 400h X • A = 3h • B = 2 X • 3 = 1 • 2 = 1 A = 17500 / 3 = 5833.33 or 5833 B = 400 / 2 = 200 5833 + 200 = 6033 ------------------------------- Y • A = 1 • B = 4 Y • 1 = 1 • 4 = 1 A = 17500 / 1 = 17500 B = 400 / 4 = 100 ...
*November 18, 2015*

**math**

If the digits of the number are reversed, the number is increased by 36. The sum of the digits in the number is two and one–half times their difference. What is the number?
*November 18, 2015*

**math**

Twice the sum of two numbers exceed three times their difference by 8, while half the sum is one more than the difference. What are the numbers?
*November 18, 2015*

**math**

18 (M) 15 (S) 13 (E) 10 (M,E) 8 (M,S) 3 (E,S) I made a venn diagram with 3 circles for this lol. Math 10 (M,E) + 8 (M,S) = 18 18 (M) - 18 = 0 Science 8 (M,S) + 3 (E,S) = 11 15 (S) - 11 = 4 Eng 10 (M, E) + 3 (E,S) = 13 13 (E) - 13 = 0 10 (M,E) + 8 (M,S) + 3 (E,S) + 0 (M) + 4 (S...
*November 18, 2015*

**math**

a. 40 sol. 20 x 4 = 80 (max) 20 x 2 = 40 80 – 40 = 40 (min) b. 2 marks sol. 10 (correct answers) x 4 (marks given to every correct answer) = 40 8 (wrong answers) x 2 (marks deducted to every wrong answer) = 16 40 (marks by correct answer) – 16 (marks that will be ...
*November 18, 2015*

**mathss**

It's impossible to add three odd numbers for a sum that is an even number. ex 1+3+5 = 9 3+5+7 = 15 5+7+9 = 21
*November 18, 2015*

**maths**

20 x 4 = 80
*November 18, 2015*

**Math**

In 5 years, Ana's age will be twice the age of her friend Jun. 5 years ago, she was 3 times as old as her friend. Find their present ages.
*November 17, 2015*

**math**

12 x 15 = 180 180 x 5 = 900 900 + 245 = 1145
*November 17, 2015*

**Integer Exponents**

1) (6abc^2) / 15a^2 x (2bc / 3a)^-2 = 2) (4x^3 2x^-4) / (5x)^-1 =
*November 17, 2015*

**math (Calculus III)**

In this example we should use the beta function. But I'm a bit lost, because I don't know how to change the limits of the integral to fit the one that is needed when using B-function. The problem goes like this: integrate cos^7(x) dx, limits of the integral are from 0 ...
*November 17, 2015*

**physics b**

If heat Q is required to increase the temperature of a metal object from 4°C to 6°C, the amount of heat necessary to increase its temperature from 6°C to 12°C is A Q B 2 Q C 3 Q D 4Q please help me asap
*November 12, 2015*

**physics b**

If heat Q is required to increase the temperature of a metal object from 4°C to 6°C, the amount of heat necessary to increase its temperature from 6°C to 12°C is _____.
*November 12, 2015*

**MATH**

Thank you
*November 4, 2015*

**MATH**

Is the simplified form of 2square root of 3 − 2square root of 3 rational? Yes or no
*November 4, 2015*

**Math**

Simplify 3 square root of 5 end root minus 2 square root of 7 end root plus square root of 45 end root minus square root of 28. A.2 square root of 12 B.2 square root of 2 C.6 square root of 5 - 4 square root of7 D.6 square root of 10 - 4 square root of 14
*November 4, 2015*

**Math**

Mr. Niles has a box of accessories for clarinets. He has a total of 42 objects. He has 12 mouthpieces. He has four times as many reeds as neck straps. How many of each object does he have? I tried so hard but I just didn't understand it and I am in fifth grade. Please ...
*November 3, 2015*

**math**

rebecca bought 1 1/2 pounds of grapes, they cost her $3.72 per pound. What was the total cost of her grapes?
*November 2, 2015*

**physics**

A 38 kg penguin is sliding across a patch of ice, starting at 13 m/s. If the coefficient of friction is .12, how far will the penguin slide before incomes to a halt.
*October 23, 2015*

**biology**

The American curl is a breed of cat that has curly ears. The allele for curly ears is dominant. Suppose a male cat with the heterozygous genotype is bred to a female cat with the homozygous recessive genotype. Predict the number of kittens that will have the phenotype for ...
*October 21, 2015*

**Science **

Hi!I wished you can help me with my science fair project.I don't know what to do or which to pick.Please help me.Any suggestion?I'm a fifth grader by the way.I appreciate it a lot. Endless Thanks, Marie
*October 13, 2015*

**math**

If someone paid $59.00 on their taxable income with a state income tax rate of 6%, determine the amount of their taxable income.
*September 26, 2015*

**math**

I'm trying to solve them but I kept getting them wrong, so my plan B is to get the answer from somewhere else, because I'm struggling whit this quiz.
*September 7, 2015*

**math**

A factory is to be built on a lot measuring 210 ft by 280 ft. A local building code specifies that a lawn of uniform width and equal in area to the factory must surround the factory. a) What must the width of the lawn be? b) And If the dimensions of the factory are A ft by B ...
*September 7, 2015*

**math**

Suppose an object is dropped from a height h0 above the ground. Then its height after t seconds is given by h=−16t^2+h0, where h is measured in feet. If a ball is dropped from 48 feet above the ground, how long does it take to reach ground level?
*September 7, 2015*

**math**

Thanks, those are the same results that I got, but I don't know why it keeps giving me a note that it says that my answer is wrong.
*September 7, 2015*

**math**

What must the width of the lawn be? and If the dimensions of the factory are A ft by B ft with A<B, then A=? B=?
*September 7, 2015*

**math**

A factory is to be built on a lot measuring 210 ft by 280 ft. A local building code specifies that a lawn of uniform width and equal in area to the factory must surround the factory.
*September 7, 2015*

**math**

The perimeter of a rectangle is 24, and its diagonal is √74. Find its dimensions and area.
*September 7, 2015*

**English**

oh no you misunderstood what I need to do. I will explain it a bit different. The original sentence is: Age had finally wearied him. And I need to describe to position of the adjunct finally. So in an other sentence it could be: "A few years later, the French army band ...
*August 30, 2015*

**English**

Hey guys! I need to say at which position "finally" stands. and I have no idea... Here the sentence: Age had finally wearied them. At the other sentences it was after the subject or before the predicate. something like that. And here I'm lost... Can you help me?
*August 30, 2015*

**math**

a jar contains 50 marbles that are the same size. There are 15 blue,8 yellow,and 27 red marbles.How many marbles are blue?
*July 9, 2015*

**Chemistry - PLEASE HELP!!!**

25g NaOH is dissolved in 10 ml h20 and added to 100 ml volumetric flask. Calculate the concentration in molarity.
*May 17, 2015*

**Personal Finance**

The Hernandez family is experiencing some financial pressures, even though the couple has a combined income of $66,000. Also, their eldest son, Joseph, will start college in only three years. Maria is contemplating going to work full time to add about $25,000 to the family'...
*May 14, 2015*

**Math Please Check My Answer**

Did you get this question right please answer ASAP! Thanks!
*May 7, 2015*

**science**

So I found the pressure of each one by foing 50.0 atm* 0.96 for N2 and got 48 atm. For PH2 I did 0.0035 * 50.0= 0.175 atm. For PNH3 0.03506* 50.0= 1.1753 atm, but I feel like I did something wrong because I don't know where to go from here
*April 16, 2015*

**science**

A mixture of nitrogen gas, hydrogen gas and ammonia gas reacts by: N2(g) + 3H2(g) = 2NH3(g) If the total pressure in the reaction vessel is 50.0 atm ans the equilibrium mixture contains by volume: N2= 96.143% H2= 0.3506% NH3= 3.506% what is the equilibrium constant (Kp)?
*April 16, 2015*

**Chmistry**

pcl3(g) cl2(g) ¨ <--- pcl5(g) Energy Some PCl3 and Cl2 are mixed in a container at 200 degrees celius and the system reaches equilibrium according to the equation above. Which of the following causes and increase in the number of moles of PCl5 present at ...
*April 16, 2015*

**math**

5/26
*March 22, 2015*

**MATH EQUATIONS**

Just learned equations and want to know if i am doing right 4 problems. 4y= 2x-2 2y=2x6 ans (-7,-4) x+2y=7 3x-2y= -11 ans (-1,4) 4x-3y= -20 5x-7y= -64 ans (4,12) 2x-5y=-1 3x+2y=8 ans (2,1)
*March 15, 2015*

**Math - Equations**

Just learned equations and want to know if i am doing write.. 4y= 2x-2 2y=2x6 ans (-7,-4) x+2y=7 3x-2y= -11
*March 15, 2015*

**Algebra**

In an arithmetic sequence where a6=13 and a10=25, what is the explicit formula for the general term an?
*March 12, 2015*

**Chemistry**

Help i am trying to plot data and then determine the best value of R. my data P(atm) 2.014,2.797,3.571,4.114 and V(L) 21.153,15.231,11930,10.355. there is more data but if I am given the process at starting place I would like to complete myself. thank you
*March 4, 2015*

**Religion**

"The Ethics of Belief" by W.T Clifford. Write an essay that describes his attitude towards belief. Be sure to address the following issues: 1. why does Clifford say what we believe is not merely a private matter, but a moral issue? 2. What is morally permissible for...
*March 4, 2015*

**statistics**

Suppose for the same 3000 women, we also measured their weight. Suppose the data were again normally distributed. The average weight is 143 lbs., and the standard deviation is 30 lbs. Suppose the correlation between height and weight is r = +.69. What is the slope of the best-...
*March 1, 2015*

**statistics**

can you at least explain what i can do in order to ge the answer to g-j?
*February 22, 2015*

**statistics**

Consider the following situation, and answer each of the following multiple choice questions. In your write-up, just list the sub-question letter (A-J) and your answer – no need to restate the question or to justify your answer. Situation: You have 400 data points, which ...
*February 22, 2015*

**accounting**

what accounts are affected when you invest in additional equipment for the business?
*February 8, 2015*

**Is this right**

An oxygen molecule consists of two oxygen atoms whose total mass is 5.3 x 10-26 kg and whose moment of inertia about an axis perpendicular to the line joining the two atoms, midway between them, is 1.82 × 10-46 kg·m2. From these data, estimate the effective ...
*February 5, 2015*

**math**

18 children are present in class, 1/4 are absent. How many children are there in the class altogether?
*February 4, 2015*

**delete post please**

Please delete my post Posted by Marie on Thursday, January 29, 2015 at 3:59pm.
*January 30, 2015*

**English**

Sorry the way this essay is appears is different from how I typed it. I indented and left spaces....
*January 29, 2015*

**English**

Hi! I made an essay please tell me what I am missed or how I did. And how can I improve it. Also does it sound good enough for a University student? btw I have a request if you can delete this essay after giving feedback because it's personal and private please understand...
*January 29, 2015*

**Math - Problem solving**

I did guess and check and would like to know how to set up an equation.
*January 27, 2015*

**Math - Problem solving**

I used the guess and check method for solving this problem but would like to know how to set up the equation. A camp counselor buys granola bars and juice drinks for the campers. She decides to buy 3 times as many drinks as granola bars. Predict how many of each she can buy on...
*January 27, 2015*

**Math - Problem solving**

Thanks. Membership last year was $60 and membership this year is $80.
*January 27, 2015*

**Math - Problem solving**

How do I solve this type of problem? How many steps are there. The cost of a membership at a health club last year was 75% of the cost at the club this year. This year's membership costs $20 more than last year's membership. Find the cost of a membership last year and ...
*January 27, 2015*

**Physics **

A 6.6 g bullet is stopped in a block of wood (mw = 6 kg). The speed of the bullet-pluswood combination immediately after the collision is 0.8 m/s. What was the original speed of the bullet? Answer in units of m/s.
*January 26, 2015*

**Physics**

Two students on roller skates stand face-toface, then push each other away. One student has a mass of 96 kg and the second student 56 kg. Find the ratio of the magnitude of the first student’s velocity to the magnitude of the second student’s velocity.
*January 24, 2015*

**science**

Which cells identify as the ones most likely to hold the key to increased human longevity and vitality and how might this work? Describe one alternative to cloning
*January 16, 2015*

**health**

What are some arguments against extending human life? Please describe at least one objection and one objection from your research and experience.
*January 16, 2015*

**Calculus**

Evaluate using the sum of a finite geometric series: The sum of 2^i on the range from i = 1 to n. Please Help! I don't know how to make the exponent in 2^i = to i-1!
*January 10, 2015*

**Math**

Ok..great..thx for checking.
*January 1, 2015*

**Math**

Reiny ..thanks for the formula and example. I tried it and i get that both sets of triangles are congruent but it is multiple choice with one answer. I dont know what i am doing wrong. How do I determine which two triangles on a graph are congruent. ∆QRS and ∆DEF ...
*January 1, 2015*

**Physics**

Starting from Newton’s law of universal gravitation, show how to find the speed of the moon in its orbit from the earth-moon distance of 3.9 × 108 m and the earth’s mass. Assume the orbit is a circle. So I calculated this and got 1.0 km/s, I was just wondering ...
*December 31, 2014*

**MATH**

Thanks. I used the distance formula but i am getting that both sets are congruent but there is only one answer and I don't know what i did wrong.
*December 31, 2014*

**MATH**

I entered the wrong coordinates in a previous question, i corrected down below. How do I determine which two triangles on a graph are congruent. ∆QRS and ∆DEF or ∆ABC and ∆XYZ. i found the coordinates of both sets: QRS Q(-2,5), R(-2,1), S(-5, 1) DEF D(5...
*December 31, 2014*

**Math**

What is the distance formula?
*December 30, 2014*

**Math**

How do I determine which two triangles on a graph are congruent. ∆QRS and ∆DEF or ∆ABC and ∆XYZ. i found the coordinates of both sets: QRS Q(-2,5), R(-2,1), S(-5, 1) DEF D(5,-5), E(5,-2), F(2,-2) or ABC A(4,5), B(6,2), C(2,2) XYZ X(-4,-5), Y(-6,-2), Z(-...
*December 30, 2014*