Monday

February 20, 2017
Total # Posts: 1,052

**Math**

8x + 14y = 24 6x + 7y = 10 We are suppose to solve for x and y but I don't get the right answer

*February 2, 2017*

**Chemistry **

Assuming I have the following reaction: LiO2 + C +2 Mg -> LiC + 2MgO I'll be using 0.1 g of LiO2 to react with 1.2 mol C and 2.2 mol Mg in excess. How much C and Mg in grams do I need?

*January 26, 2017*

**Calc**

This summer Borice decides to put a rectangular swimming pool in his back yard. The material he uses for the border of the length of the pool costs $10 per foot and the material he uses for the width costs $5 per foot. He would like spend $1,000 on the perimeter of the pool. ...

*December 11, 2016*

**math**

F(x,y) represents a velocity field of a fluid over a surface z=6-3x-2y.If the magnitude of the velocity in the direction of the unit normal vector,n on S is 3z/(surds14), compute the flux of F(x,y) over the surface S in the first octant oriented upward using the projection of ...

*December 10, 2016*

**math**

F(x,y) represents a velocity field of a fluid over a surface z=6-3x-2y.If the magnitude of the velocity in the direction of the unit normal vector,n on S is 3z/(surds14), compute the flux of F(x,y) over the surface S in the first octant oriented upward using the projection of ...

*December 10, 2016*

**soil mechanic**

In order to determine the average permeability of a bed of sand 12.5 m thick overlying an impermeable stratum, a well was sunk through the sand and a pumping test carried out. After some time the discharge was 850kg/min and the drawdowns in observation wells 15.2m and 30.4m ...

*December 9, 2016*

**physics**

A wooden box, with a mass of 22 kg, is pulled at a constant speed with a rope that makes an angle of 25° with the wooden floor. What is the tension in the rope?

*December 6, 2016*

**pre calculus**

Use the information to solve the triangle. If two solutions exist find both. 1.A=36°, B=98°, c=16 2.a=4, b=8, c=10 3.A=35°, b=8, c=12

*November 26, 2016*

**Chemistry**

h2po4(aq) + co34(aq) hco3 (aq) + hpo42 (aq)

*November 25, 2016*

**homework**

There are 13 fewer pigs than goats on the farm. There are 8 pigs. How many goats are there?

*November 23, 2016*

**Calculus - fundamental theorems**

d/dx integral e^t^2 dt from 1 to x^3 Please help. I think I'm supposed to use substitution for the x^3 and then apply the chain rule but I'm not sure how to do that.

*November 23, 2016*

**English**

I like the previous answer. By the way, if you do not mind, I copy for myself the structure of the essay . So, I will be sure what do to step by step. In case, it still will not work for you, you may actually go and get some help from the experts I like. Check Marvelous essay ...

*November 19, 2016*

**Fluid Mechanic**

3) Air at standard conditions enters the compressor shown in Fig. Q3 at a rate of 0.3m3/s. It leaves the tank through a 3 cm diameter pipe with a density of 1.8 kg/m3 and the uniform speed of 210 m/s. (a) Determine the rate (kg/s) at which the mass of air in the tank is ...

*November 15, 2016*

**Math**

What is the first common number among: palindromic numbers, Triangular numbers and Fibonacci numbers?

*November 12, 2016*

**Social studies**

The answer is b and I'm working on it right now laugh out loud are you a connections student?

*October 13, 2016*

**Math**

334/32 82x32 259.2

*October 11, 2016*

**Math**

259.0

*October 11, 2016*

**Math**

James earned 334 for working a 40- hour week. How much will he earn in a week in which he works only 32 hours? I got 294.0?

*October 11, 2016*

**Chemistry 2**

we make a solution of water and ethylene glycol c2h4(oh)2 which contains 24 g of the glycol for each 74 g of water. What is the boiling point of ethylene?

*October 11, 2016*

**Chemistry**

Calculate the value of Z and its absolute standard deviation. All standard deviations shown are absolute. Show your work and report the standard deviation in the result with two significant digits (to confirm the correct result). Z = (1.18+/-0.07)x((2.21+/-0.05)^3)

*October 3, 2016*

**Chemistry**

A student does a standard addition experiment by pipetting 25 mL of unknown, adding ferrous ion spikes and reagents, into a 100 mL volumetric flask and making up to the mark. The equation of the line has a slope of 0.103 and an intercept of 0.135 when the unit of concentration...

*October 3, 2016*

**algebra**

A is correct answer

*October 2, 2016*

**algebra**

Write the polynomial in standard form. Then name the polynomial based on its degree and number of terms. 2 – 11x^2 – 8x + 6x^2 A. –5x^2 – 8x + 2; quadratic trinomial B. –5x^2 – 8x; quadratic binomial C. –6x^2 – 8x – 2; ...

*October 2, 2016*

**algebra**

Correct answer is 0

*October 2, 2016*

**algebra**

I put 0 . We will see.

*October 2, 2016*

**algebra**

What is the degree of each monomial? -9 A. -8 B. 0 C. -10 D. 1

*October 2, 2016*

**Counting Method**

A company has 11 male and 10 female employees, and needs to nominate 2 men and 2 women for the company bowling team. How many different teams can be formed?

*October 2, 2016*

**Math 😢😢😢😢😢 Help**

Suppose a jar contains 5 red marbles and 33 blue marbles. If you reach in the jar and pull out 2 marbles at random, find the probability that both are red.

*October 2, 2016*

**Compute Probability 😯😢**

Compute the probability of randomly drawing five cards from a deck and getting 3 Aces and 2 Kings. (Give your answer as a fraction.)

*October 2, 2016*

**Graph Theory**

Must the Graphical Sequence Algorithm always give a connected graph? Assuming the sequence is graphical.

*October 1, 2016*

**math**

By your cell phone contract, you pay a monthly fee plus some money for each minute you use the phone during the month. In one month, you spent 200 minutes on the phone, and paid $22.45. In another month, you spent 350 minutes on the phone, and paid $29.65. Let x be the number ...

*September 30, 2016*

**Math**

25 minuets because Mandy can clean it faster but them working together wont make it faster.

*September 29, 2016*

**Algebra**

Consider the following system of equations. Solve and write as a coordinate point. 5x+4y=-14 3x+6y=6 Please help and thanks

*September 19, 2016*

**Math**

An automobile uses 8 gallons in traveling 120 miles at that rate how many gallons will be used in 360 miles?

*September 14, 2016*

**Physics**

If the sled in the the previous question weighs 530 newtons and the horse pulls it with a force of 140 newtons across level ground at a constant speed, what is the magnitude of the force of friction between the sled rails and the snow? Hide hint for Question 8 Hint 1: Remember...

*September 12, 2016*

**chem**

calculate volume of excess KOH(aq) and the volume of 6.00M H2SO4(aq) to neutralize it

*September 5, 2016*

**chem 2**

0.946g Al in 35 ml of 2.00M KOH and obtained 13.8g of dry alum. calculate the theorecital and actual yield %

*September 5, 2016*

**physics**

Runner A is initially 6.0 km west of a flagpole and is running with a constant velocity of 7.8 km/h due east. Runner B is initially 4.2 km east of the flagpole and is running with a constant velocity of 7.6 km/h due west. What will be the distance of the two runners from the ...

*August 29, 2016*

**English**

Last one just makeing sure Which of the following lines is an example of personification? A. “The weeping of the guitar / begins” B. “I am offering this poem to you” C. “He didn’t fight / he hadn’t fought at all” D. “My ...

*July 6, 2016*

**English**

To what does the speaker in “The Empty Dance Shoes” compare the energy of dance shoes at rest? A. “The Colossus” by Sylvia Plath B. A clown knocked down by a sandbag C. the music in the Stardust Ballroom D. a 98-pound weakling Is it B?

*July 6, 2016*

**English**

Thank you so much !

*July 6, 2016*

**English**

I think the both are..hmm so is the answer is D?? All of above?

*July 6, 2016*

**English**

I know it is not A.

*July 6, 2016*

**English**

Which of the following is an example of a narrative poem? A. The Bridegroom by Alexander Pushkin B. The Fish by Elizabeth Bishop C. Danny Deever by Rudyard Kipling D. All of the above

*July 6, 2016*

**Chemistry**

What causes a reaction to be spontaneous? Answer by answering each part a) (1 point) What is definition of spontaneous reaction?b) (1 point) What is Gibbs free energy?c) (1 point) How is Gibbs free energy related to a spontaneous reaction?d) (1 point) What is an example of a ...

*May 17, 2016*

**Chemistry**

The solubility product constant of Calcium hydroxide is 6.5 * 10^-6 . If 0.10 mo of sodium hydroxide is added to 1 L of 0.0001 M Ca(OH)2, what is the final concentration of the calcium ion? SHOW your work. Again, I have no idea where to start

*May 17, 2016*

**Chemistry**

A 45.0 g piece of copper wire is heated. And the temperature of the wire changes from 21.0 degrees C to 88.0 degrees C. The amount of heat absorbed is 280.6 cal. Find the specific heat of Copper. SHOW your work. Please help! I have no Idea where to start or what to do

*May 17, 2016*

**Physics**

Urgent. A density bottle weigh 0.25 when empty and 0. 75 when. Filled with water and 0.65N when filled with alcohol calculate the volume of water,the density of alcohol. Take density of water=1000kg/m3 acceleration due to gravity= 10m/s

*May 13, 2016*

**Math 1324**

A manufacturer produces two models of elliptical cross-training exercise machines. The times for assembling, finishing, and packaging model A are 3 hours, 3 hours, and 0.8 hour, respectively. The times for model B are 4 hours, 2.5 hours, and 0.4 hour. The total times available...

*May 10, 2016*

**Language Arts**

wet with dew straggly branches slapped and scratched at my legs and hid uneven ground so that several times tumbling and sliding downward which type of conflict best characterizes the event in the passage? a character vs self b character vs nature c character vs society d ...

*May 10, 2016*

**Chemistry**

The nitric acid was purchased as a solution that has 70% HNO3. That volume (mL) of this solution is necessary for preparing 250 mL Solution 2.0 mol L-1? The density of HNO3 (aq) 70% is 1.42 g cm-3

*May 10, 2016*

**Chemistry**

How many grams of sucrose will be necessary to prepare 300 ml of a 5% solution of sucrose (342.0 g/mol)

*May 9, 2016*

**Math**

A bowl has red,green and blue marbles.There are 95 red marbles.the nuber of blue marbles is 5 timesthe number of green mables altogether red and green marbles are 189 less then blue marbles .how may marbles are there in total

*May 6, 2016*

**Calculus**

An object's velocity after t seconds is v(t)= 38-2t feet per second. a. How many seconds does it take for the object to come to a stop (velocity = 0)? b. How far does the car travel during that time? c. How many seconds does it take the car to travel half the distance in ...

*April 29, 2016*

**Chemistry**

What mass of CaO, can get by the decomposition of 250 g of CaCo3 with 80% purity?

*April 23, 2016*

**Chemistry**

You get poo and put in poo

*April 13, 2016*

**Algebra**

5, 12, 13

*March 23, 2016*

**Nuclear**

Per GWe-year, a 3700 MWt Sodium Fast Reactor produces 558 kg and consumes 789 kg of fissile plutonium in the core while producing 455 kg and consumes 34 kg of fissile plutonium in the reflector (breeding blanket). Assume 200 MeV per fission and a capture-to-fission ratio of 0....

*March 18, 2016*

**Physics**

someone swings a bucket of water in a vertical circle. Describe the water's motion to another person? or How would you? & also how to explain the motion of the water to them? How come the water didn't fall on the persons head?

*March 15, 2016*

**Algebra 1**

The problem is: a raised to the 2nd power plus 14a raised to the 5th power plus a raised to the 7th minus 16

*March 15, 2016*

**Math**

Integration Given that: t ∫ (3X + 2) dx = (13/2) 1 Find the value of t

*March 8, 2016*

**math**

5+10=15 crickets 15+5=20 ladybugs He finds 20 ladybugs.;

*February 25, 2016*

**Algebra**

Write an equation for the line that passes through the points (0,5) and (4,12). Use any valid form of a linear line. b)You are taking a Yellow Cab in St. Paul from Como Park to the State Capitol (a 3.2 mile trek). When you get in, you are charged $6.90 for the likely amount of...

*February 24, 2016*

**Math**

A jet is flying through wind blowing 55mi/h at a bearing (clockwise from north) of 35°. The jet is flying with a speed of 550 mi/h at a bearing of 65°. Find the resultant of the planes velocity vector and the winds velocity vector. Also find its magnitude and direction...

*February 23, 2016*

**CHEMISTRY**

find the concentrations of H+, HCO3-, CO3 2- in a 0.025M in H2CO3 solutions

*February 22, 2016*

**Math**

5x-7(2-4x)

*February 9, 2016*

**English**

_____ and _____ are in Brooklyn What does this mean. It asked what borough we live in and I said Brooklyn and I don't get what the 2nd question is

*February 2, 2016*

**US History**

Yes, I know that the West was more rural and the East was more urban. What about the economy? That's what I'm having trouble with.

*January 28, 2016*

**US History**

I think someone might have already asked this question.... In American history, The West and the East, what were the major characteristics of each during the late 1800s? (Try to think broadly here and consider where economic power was concentrated, what the influences on each ...

*January 28, 2016*

**U.S History**

I think someone might have already asked this question.... In American history, The West and the East, what were the major characteristics of each during the late 1800s? (Try to think broadly here and consider where economic power was concentrated, what the influences on each ...

*January 28, 2016*

**Chemistry**

1. A graduate measured out a 100. mL hard water sample and titrated it with 37.6 mL of 0.0100 M EDTA solution for a total hardness endpoint, and 29.3 mL of 0.0100 M EDTA solution for a calcium endpoint. Calculate the molarity with respect to magnesium and calcium. Please ...

*January 21, 2016*

**sociology**

assist me on getting the correct answer because i don't quite understand all of it yet.

*December 18, 2015*

**sociology**

Identify the following: Social conflict, empowerment theory and feminist theory. How are the theories similar? How are the theories different? What are the implications for interventions and community development?

*December 18, 2015*

**sociology**

Existential psychology has four basic themes. Define the themes. How are those themes different from humanistic theory themes of positive psychology and suffering of existentialism?

*December 18, 2015*

**Physics**

A 2-kg small block is dropped from rest. The spring has a constant k = 500N/m. If the entire track is frictionless except for the 1m between points B and C, where the coefficient of kinetic friction is 0.15, find he maximum compression of the spring.

*December 13, 2015*

**Physics**

The Volume of air in a car tire is 800cm^3 and the pressure is 290kPa. Determine the volume the air would occupy as soon as the tire bursts on a day when the atmospheric pressure is 102kPa. (Assume that the temperature remains constant and assume an ideal gas)

*December 5, 2015*

**Physics**

The Volume of air in a car tire is 800cm^3 and the pressure is 290kPa. Determine the volume the air would occupy as soon as the tire bursts on a day when the atmospheric pressure is 102kPa. (Assume that the temperature remains constant and assume an ideal gas)

*December 5, 2015*

**Physics**

The Volume of air in a car tire is 800cm^3 and the pressure is 290kPa. Determine the volume the air would occupy as soon as the tire bursts on a day when the atmospheric pressure is 204kPa. (Assume that the temperature remains constant and assume an ideal gas)

*December 5, 2015*

**english**

how would you describe some who is crazy to jump from outer space to earth

*December 5, 2015*

**Government**

What is the difference between criminal and civil law?

*December 5, 2015*

**Government**

to limit supreme court

*December 1, 2015*

**Government**

does Congress have ability to change the structure and jurisdiction of the Court

*December 1, 2015*

**Government**

I think it is ( a ) or ( c ) but not sure What makes precedent important in our justice system? a) It is the current interpretation of the law. b) The US justice system does not use precedent. c) It provides a historical background but is not relevant in current cases. d) It ...

*December 1, 2015*

**Government**

I think it is ( a ) or ( c ) but not sure What makes precedent important in our justice system? a) It is the current interpretation of the law. b) The US justice system does not use precedent. c) It provides a historical background but is not relevant in current cases. d) It ...

*December 1, 2015*

**Government**

i think it is answer ( b ), can someone make sure What is the difference between criminal and civil law? a) There is no difference. b) The standard of guilt is higher in criminal law than it is in civil law c) The government is always involved in civil law but never in ...

*December 1, 2015*

**chemistry**

How do you work out the pKa of a substance from the titration curve that has two equivalence points?

*November 30, 2015*

**Chemistry**

Sulfuric acid is produced commercially by the reactions indicated below at the appropriate percent yields for each step. The second step utilizes air as a source of oxygen and heats it to 4000C in the presence of vanadium (V) oxide, a catalyst. Assuming air is 21% oxygen by ...

*November 29, 2015*

**Chemistry**

If 5.026g chromium is combined with 3.04L of chlorine gas at 0.955atm and 220C, what mass of chromium (III) chloride is produced?

*November 29, 2015*

**Math**

Thank You

*November 27, 2015*

**Math**

The table below represents the velocity of a car as a function of time: Time (hour) x Velocity (miles/hours) y 0 50 1 52 2 54 3 56 Part A: What is the y-intercept of the function, and what does this tell you about the car? Part B: Calculate the average rate of change of the ...

*November 27, 2015*

**Chemistry**

If 5.026g chromium is combined with 3.04L of chlorine gas at 0.955atm and 220C, what mass of chromium (III) chloride is produced?

*November 27, 2015*

**Chemistry**

What would the volume be of 0.955g of propane at 735 torr and 35.00C? And How many mols of xenon would be required to create a mixture with a mole fraction of xenon of 0.0190 if the mixture were also to contain 2.16mol argon and 3.612g neon? Thanks in adavance

*November 27, 2015*

**Chemistry**

what volume of oxygen at 423.0K and a pressure of 127.4kPa will be produced by the decomposition of 129.7g barium peroxide to form barium oxide and oxygen gas? Thank you

*November 27, 2015*

**Chemistry**

A Sample of propane, C3H8, occupies 5.00L at 270C and 309torr. The volume of the canister is changed to 1.85L while the pressure remains constant. What is the Temperature, in K and 0C, of the gas after the change? What would be the setup for this problem? Thank you.

*November 26, 2015*

**Math**

I need help on this one too

*November 25, 2015*

**math**

Pls give me the solution

*November 21, 2015*

**math**

How many of the 2-digit numbers, that can be formed by using the digits 1,2,3,.......,9 without repeating any digit, are divisible by4? If 2 boys and 2 girls are to be arranged in a row so that the girls are not next to each other, how many possible arrangements are there? A ...

*November 21, 2015*

**math**

Pls pls help

*November 21, 2015*

**math**

The average marks of 14 students was 71. It was later found that the marks of one of the students has been wrongly entered as 42 instead of 56 and of another as 74 instead of 32. What is the correct average? Average age of seven persons in a group is 30 years, the average age ...

*November 21, 2015*

**math**

Mam, I have a question where is .25 come from in 2nd question?

*November 20, 2015*