Saturday

April 25, 2015

April 25, 2015

**math**

Identify the solution(s) of the system of equations, if any. x + 2y = 7 3x - 6y = 3 (4, ) (4, ) (, 4) (, 4)
*Tuesday, October 21, 2014 at 12:04am*

**Physics**

This is a question related to work. Today we had a pop quiz in my physics class and I am just trying to check my work here :D 1) if there is a 5 kg block on a horizontal table connected with string to a 3 kg block hanging off the side of the table through a pulley. Assume the ...
*Monday, October 20, 2014 at 10:27pm*

**English-Annotation Please Help **

In the recent years, the media has shared with the public two very different stories involving children who committed acts of violence. Both minors were charged with murder and sent to adult state prison to serve their prison sentences. Some people may believe these teens ...
*Monday, October 20, 2014 at 10:13pm*

**S.S.**

8. Under the leadership of Lucretia Mott and Elizabeth Cady Stanton, the high point of the Seneca Falls convention was the drafting of the Declaration of A. Sentiments. B. Women's Rights. C. Opinion. D. Human Rights. A? 9. Under America's second party system, the Whigs...
*Monday, October 20, 2014 at 7:59pm*

**planning & implementing for the environment**

After establishment of your child care center, equipment and supplies will comprise what percentage of your annual operating budget? A. 0.5 percent to 1.5 percentB. 1.5 percent to 3 percentC. 5.5 percent to 7 percentD. 3 percent to 5.5 percent B
*Monday, October 20, 2014 at 7:33pm*

**Health JUST NEED ANSWERS CHECKED :)**

1. Your respiratory system is the system in your body that is responsible for breathing. True*** False 2. The lungs are made up of thick fibrous tissue. True False*** 3. Internal respiration takes place in the alveoli. True False*** 4. The alveoli are located at the end of the...
*Monday, October 20, 2014 at 6:06pm*

**World History (Ms. Sue)**

Which country do you think had a stronger democracy at the end of the nineteenth century, France or England? Why? A: I think England had a stronger democracy at the end of the nineteenth century. By 1870, England, or Great Britain, had long had a working two-party ...
*Monday, October 20, 2014 at 1:58pm*

**Health Check answers :)**

1. Your respiratory system is the system in your body that is responsible for breathing. True*** False 2. The lungs are made up of thick fibrous tissue. True False*** 3. Internal respiration takes place in the alveoli. True False*** 4. The alveoli are located at the end of the...
*Monday, October 20, 2014 at 1:53pm*

** judicial system**

Explain how a defendant may be processed through The Missouri judicial system. I have searched the internet and I can not information on this.
*Monday, October 20, 2014 at 1:36pm*

**Algebra**

I really need your help in solving this problem. Your time and efforts will be very much appreciated. Here is the question? Graph the solutions of each system: (x <= 0 (y < 0
*Monday, October 20, 2014 at 2:22am*

**Physics: mechanics **

A 250g bullet with a speed of 500m/s passes through the center of a 1.5kg square wooden block [ side length 18cm] at rest upon a horizontal frictionless surface. As it exits the block, the bullet has a speed of 150m/s. A) find the initial speed of the center of mass of the ...
*Monday, October 20, 2014 at 1:15am*

**Anatomy and Physiology**

There are many disease, disorders, syndromes that attack the muscular system such as muscular dystrophy, hypotonia, polio, etc. Because of our research facilities and advanced medical care in the United States, many of the people in our country who are victims of these ...
*Sunday, October 19, 2014 at 11:59pm*

**Calculus**

A pulley system on a pier is used to pull boats towards the pier for docking. Suppose that a boat is being docked and has a rope attaching the boat's bow on one end and feeding through the pier's pulley system on the other end. The pulley system is 1 meter higher than ...
*Sunday, October 19, 2014 at 8:26pm*

**Physics**

Consider a rod plus disc system. The rod has a total length L =1.30 m, while the disc has a radius of R = L/2. The pivot is at P where the distance between P and the end of the rod is L/4. Point O is at the center of the disc, and the distance between O and P is 0.975 m. The ...
*Sunday, October 19, 2014 at 5:13pm*

**biology**

Where is the location of the phosphatase enzyme in the digestive system. There is no site that i can find that can provide an answer...
*Sunday, October 19, 2014 at 1:58pm*

**English**

I need help annotating please help me In the recent years, the media has shared with the public two very different stories involving children who committed acts of violence. Both minors were charged with murder and sent to adult state prison to serve their prison sentences. ...
*Saturday, October 18, 2014 at 4:44pm*

**S.S.**

11. Under the _______ system, Spanish conquistadores were rewarded with local villages and control over the local labor force. A. encomienda B. plantation C. impresario D. land reform A?
*Saturday, October 18, 2014 at 4:16pm*

**Criminal Justice/Report Writing**

Which of the following is one of the reasons the Uniform Crime Reporting Program __________ in 1982? A. was renamed the Summary Data Reporting System B. discontinued collecting and tracking statistics C. was revised D. broke ties with the FBI I am torn between A & C.
*Saturday, October 18, 2014 at 12:13pm*

**physics**

A mass of 3.25 kg is attached to the end of a spring that is stretched 20 cm by a force of 14 N. It is set in motion with an initial position x_0 = 0 and initial velocity (in m/s) v_0 = -11. Find the amplitude, period, and frequency of the resulting motion. You should assume ...
*Friday, October 17, 2014 at 8:43pm*

**science**

The muscular system is essential because it allows our bones to A. Strength B. Contract C. Lengthen D. Move Is the answer is D? Thanks.
*Friday, October 17, 2014 at 7:41pm*

**Thermodynamics**

Steam in a cylinder-piston arrangement expands from an initial condition of 5 bar, 80% dry to a final state of 2 bar, dry saturated steam. The initial volume of steam is 0.8 m3. The process of expansion can be represented by a straight line on the p–Vdiagram. 5B. What is ...
*Friday, October 17, 2014 at 7:25am*

**physics laws of motion**

a block of mass 300kg is set into motion on a frictionless horizantal surface with help of frictionless pulley and a rope system.what horizantal force F should be applied to produce an acceleration of 1m/s in block
*Friday, October 17, 2014 at 2:59am*

**Grade 12 **

a 4.0kg block is attached to a vertical rod by two strings.when the system rotates about the axis of the the rod,the strings extend.What is the tension in the lower cord if tension on upper cord is 60N ?
*Friday, October 17, 2014 at 12:20am*

**Drug Law**

The author argues that illegal use of____ highlighted the presence of racial discrimination in the criminal justice system. 1)crack & powder cocaine 2)pot & meth 3)crack & pot 4)pot & heroin
*Thursday, October 16, 2014 at 5:05pm*

**Sociology**

Which of the following disadvantages built into the criminal justice system is not class based? 1) Jim Crow laws 2)Visibly crowed residential areas 3)An ability to pay bail 4)Racial profiling is the reason for African American pedestrian stops
*Thursday, October 16, 2014 at 4:44pm*

**chemistry**

A mixture containing 15 g of carbon and 25 g of oxygen is sealed in a flask. The total mass of the system is 140 g. The flask is then heated to cause the carbon and oxygen to react. The sealed flask is then weighed. What is the final weight of the system?
*Wednesday, October 15, 2014 at 2:20pm*

**Science**

what system/part of the body does the disorder affect?
*Tuesday, October 14, 2014 at 5:06pm*

**physics**

A bumper car with mass m1 = 100 kg is moving to the right with a velocity of v1 = 4.6 m/s. A second bumper car with mass m2 = 86 kg is moving to the left with a velocity of v2 = -3.8 m/s. The two cars have an elastic collision. Assume the surface is frictionless. 1) What is ...
*Tuesday, October 14, 2014 at 4:40pm*

**physics**

The system in the Figure is in equilibrium. A mass M1 = 226.0 kg hangs from the end of a uniform strut which is held at an angle è = 41.0° with respect to the horizontal. The cable supporting the strut is at angle á = 27.4° with respect to the horizontal...
*Tuesday, October 14, 2014 at 4:19pm*

**math**

In a suspension bridge, the shape of the suspension cables is parabolic. The bridge shown in the figure has towers that are 400 m apart, and the lowest point of the suspension cables is 100 m below the top of the towers. Find the equation of the parabolic part of the cables, ...
*Tuesday, October 14, 2014 at 12:24pm*

**physic**

Two boxes are connected by by a massless string over a massless, frictionless pulley. Box 1 has a mass of m1 = 15.0 kg and is initially at rest at the bottom of a frictionless surface inclined at an angle θ = 30.0◦ above the horizontal. Box 2 has a mass of m2 = 10.0...
*Tuesday, October 14, 2014 at 12:13pm*

**science**

The primary unit of length in the metric system is the: kilometer meter millimeter centimeter
*Tuesday, October 14, 2014 at 11:05am*

**Algebra**

Mina's catering service is organizing a formal dinner for 280 people.The hall has two kinds of tables, one that seats 4 people and one that seats 10 people.The hall can contain up to a total of 52 tables.Write and graph a system of inequalities that can be used to ...
*Monday, October 13, 2014 at 11:36pm*

**physic**

Two boxes are connected by by a massless string over a massless, frictionless pulley. Box 1 has a mass of m1 = 15.0 kg and is initially at rest at the bottom of a frictionless surface inclined at an angle θ = 30.0◦ above the horizontal. Box 2 has a mass of m2 = 10.0...
*Monday, October 13, 2014 at 7:17pm*

**Differential Equations**

Consider the system shown below of two masses of mass m, coupled together between two fixed walls via springs with varying spring constants. Let x(t) and y(t) be the horizontal displacements of the two masses as a function of time. (a)Write down a system of differential ...
*Monday, October 13, 2014 at 5:55pm*

**physics**

A frictionless massless pulley has 7 kg tied to a cable on the left side and an unknown mass (M) on the right. The unknown mass accelerates downward at 6.6 m/s2 What is the accelerationof the system/tension of the rope
*Monday, October 13, 2014 at 5:12pm*

**Physics **

A particle of mass =6.50 kg moves with a velocity v1=x1i+y1j+z1k. A second particle of mass =3.50 kg moves with a velocity v2=x2i+y2j+z2k. And a third particle of mass =6.30 kg moves with a velocity v3=x3i+y3j+z3k. Here, (x1,y1,z1)=(-2.5,5.4,1.2), (x2,y2,z2)=(-2.3,0.1,-2.5) ...
*Monday, October 13, 2014 at 4:21pm*

**College Physics**

Two crates are connected by a massless rope that passes over a pulley. If the crates have mass 33 kg and 82 kg, find their acceleration. If the system begins at rest, with the more massive crate a distance 12 m above the floor, how long does it take for the more massive crate ...
*Monday, October 13, 2014 at 3:43pm*

**Math**

1) An aerobics class is being offered at the ABC body gym. Nonmembers pay $4 per class while member pay a monthly fee of $10 plus $2 per class. a. Create a linear system to represent the two options. b. At how many classes will the cost be the same? What is that cost? c. When ...
*Monday, October 13, 2014 at 11:26am*

**Math**

3) While traveling for vacation, you have decided to divide your lodging between a resort, and a regular stay hotel. Let x represent the number of nights you will spend in a resort, and let y represent the number of nights you will spend in a regular stay hotel. a. Write a ...
*Monday, October 13, 2014 at 2:08am*

**physics**

. What is the resultant momentum of a system of two particles with these masses and velocities: 3.75 kg moving north at 5.6 m/s and 4.2 kg moving northwest at 2.3 m/s?
*Sunday, October 12, 2014 at 8:59am*

**Algebra 2 Answer Check**

Classify each system and determine the number of solutions. {3y = 2x; -4x + 6y = 3 A: inconsistent; no solution
*Saturday, October 11, 2014 at 8:16pm*

**Biology**

What is the location and effect of waves of contraction in the digestive system.
*Saturday, October 11, 2014 at 8:05pm*

**Math College (Algebra)**

How to solve this system? x + [(3x-y)/(x^2+y^2)] = 3 y - [(x+3y)/(x^2+y^2)] = 0
*Saturday, October 11, 2014 at 7:19pm*

**Algebra 2**

solve each system of equation 3x+5y+2z=4 2x-2y+3z=-4 x+y+z=0 *could you show work because I want to learn how you got this answer
*Saturday, October 11, 2014 at 5:35pm*

**College Algebra**

How to solve this system? x + [(3x-y)/(x^2+y^2)] = 3 y - [(x+3y)/(x^2+y^2)] = 0
*Saturday, October 11, 2014 at 9:25am*

**Physics**

Block B in the figure(Figure 1) rests on a surface for which the static and kinetic coefficients of friction are 0.65 and 0.40, respectively. The ropes are massless.What is the maximum mass of block A for which the system is in equilibrium? (Consider the state of the system ...
*Friday, October 10, 2014 at 8:01pm*

**Physics**

Two masses, m1 = 25.0 kg and m2 = 45.0 kg, are attached by a massless rope over a massless pulley as shown above?The angle of the frictionless incline is 27.0 degrees . Assume that m2 starts at rest and falls a vertical distance of 3.00 m. Assume m1 also starts at rest and the...
*Friday, October 10, 2014 at 3:10am*

**Statistics**

Assume that the mean hourly cost to operate a commercial airplane follows the normal distribution with a mean of $2,325 per hour and a standard deviation of $240. What is the operating cost for the lowest 5 percent of the airplanes?
*Thursday, October 9, 2014 at 11:31pm*

**physics**

A 20 kg object is acted on by a conservative force given by F = -3.0 x - 5.0 x 2, with F in newtons and x in meters. Take the potential energy associated with the force to be zero when the object is at x = 0. (a) What is the potential energy of the system associated with the ...
*Thursday, October 9, 2014 at 11:23pm*

**physics**

Two people jump out of an airplane. They hold on to each other while falling straight down at a shared terminal speed of 60.7 m/s. Suddenly, they push away from each other. Immediately after separation, the first skydiver (who has a mass of 89.3 kg) has the following velocity ...
*Thursday, October 9, 2014 at 10:40pm*

**physics**

The pulley system in Figure 6-25 is used to lift a crate of mass m = 41 kg. Note that a chain connects the upper pulley to the ceiling and a second chain connects the lower pulley to the crate. Assume that the masses of the chains, pulleys, and ropes are negligible.
*Thursday, October 9, 2014 at 9:47pm*

**Algebra**

Graph the system below and write its solution. =3x+y−6 =y−1/2x-1
*Thursday, October 9, 2014 at 8:25pm*

**Algebra**

Graph the system below and write its solution. =+3xy−6 =y−−12x1
*Thursday, October 9, 2014 at 8:09pm*

**Physics **

A crate sets on wooden horizontal surface (a wooden floor). The figure shows a top view of this looking down onto the crate (gravity would be acting into the page). Man one and man two apply forces F1 and F2, at angles of θ1 and θ2 respectively, with the goal of ...
*Thursday, October 9, 2014 at 1:27pm*

**College Science **

A chandelier is suspended by two identical, vertical chains side by side. The chandelier's mass is m = 5.3 kg. A. If the tension in one chain is represented by T, write an expression for this tension in terms of m and g, the gravitational acceleration on the Earth's ...
*Thursday, October 9, 2014 at 1:17pm*

**@someone who can show me how to do this**

Hi I'm Aluminum<3 Helping and C.S.I, but you can call me Alumi. for short. So here's my Question,Determine how many solutions exist for the system of equations. I need someone who can WORK IT OUT with me and SHOW me how to do it. 1. 6x+y=−3 2. 6x+y=−3 ...
*Thursday, October 9, 2014 at 1:14pm*

**Physics**

In the system shown in the figure, suppose the block has a mass of 2.7kg , the spring has a force constant of 500N/m , and the coefficient of kinetic friction between the block and the floor is 0.18. Find the work done on the block by the spring and by friction as the block is...
*Thursday, October 9, 2014 at 11:07am*

**physics**

In the figure, a frictionless roller coaster car of mass m = 938 kg tops the first hill with speed v0 = 14.9 m/s at height h = 31.5 m. How much work does the gravitational force do on the car from that point to (a) point A, (b) point B, and (c) point C? If the gravitational ...
*Wednesday, October 8, 2014 at 7:17pm*

**government**

How do the three branches work within the system of checks and balances?
*Wednesday, October 8, 2014 at 5:52pm*

**Physics**

Two masses, m1 = 25.0 kg and m2 = 45.0 kg, are attached by a massless rope over a massless pulley. The angle of the frictionless incline is α = 27.00. Assume that m2 starts at rest and falls a vertical distance of 3.00 m. Assume m1 also starts at rest and the rope remains...
*Wednesday, October 8, 2014 at 4:23pm*

**Physics**

Assume that the batter did not continue to swing the bat after the collision (no energy was added to the system). How fast was the bat moving after the collision? The ball mass .145kg, the bats mass is 1.1kg. And the balls velocity is 44.7m/s and the bats velocity prior to ...
*Wednesday, October 8, 2014 at 1:13pm*

**algebra**

What is the solution to the linear system of equations? x + 4y = 8 x y = 7 (4, 3) (4, 3) (7, 0) The system has no solution.
*Wednesday, October 8, 2014 at 10:46am*

**social studies**

1.How were the farms of New England colonies similar to the farms of the up country? a. They grew rice b. They were plantations*** c. They had short growing seasons d. They were small subsistence farms 2.Rice grew successfully in south Carolina because slaves_____. a. Brought ...
*Tuesday, October 7, 2014 at 11:41pm*

**algebra 2**

Graph the system of constraints and find the value of x and y that maximize the objective function. Constraints {x >= 0 y >= 0 y <= 3 y <= -x+5} Objective Function C=-5x+3y a) 0,0 b) 2,3 c) 5,0 d) 0,3 I am a mom going crazy. I did horrible in math in school. ...
*Tuesday, October 7, 2014 at 10:07pm*

**Physics HELP**

Two blocks having mass m1 = 6 kg(m1 on ramp of 30 degrees) and m2 =3 kg are connected by a light rope and slide on a frictionless surface as in the figure below. A force F = 10 N acts on m2 at 20 degrees relative the horizontal. Find the acceleration of the system and the ...
*Tuesday, October 7, 2014 at 7:50pm*

**Intro Physics - Newton's third rule**

a piano mover raises a 1000 N piano at a constant speed using a very light rope in a frictionless pulley system. with what force is the mover pulling down on the rope? Show steps please! Thank you!
*Tuesday, October 7, 2014 at 5:45pm*

**Satistics**

Assume that the mean hourly cost to operate a commercial airplane follows the normal distribution with a mean of $2,175 per hour and a standard deviation of $175. What is the operating cost for the lowest 10 percent of the airplanes? (Round z value to 2 decimal places. Omit ...
*Tuesday, October 7, 2014 at 4:41pm*

**Social studies **

3.how were farms of the new england colonies similar to the farms of the up country A.separating church and state B.requiring all laws be approved by the council*** C. Creating a jury system for legal decisions D. Giving the people a stronger voice in the government
*Tuesday, October 7, 2014 at 9:59am*

**Wolrd History (Ms. Sue)**

This is the final post I will post about this. However, what do you think of this as a whole? Does my writing require any improvements? Does it flow smoothly? Do you agree with my statements? I may seem a little paranoid about this, but I'm not very skilled at writing ...
*Monday, October 6, 2014 at 5:05pm*

**Social Studies**

What was one thing that the Salzburgers established that the other settlers did not? A. Hospital B. School System C. trading post D. tavern I think C??
*Sunday, October 5, 2014 at 11:18am*

**statistics**

In a major city 7 % of cars have an alarm system installed. A car without an alarm has a probability of 0.01 of being stolen, this is triple the probability of a car with an alarm being stolen. What is the probability that a car stolen from this city has an alarm system ...
*Saturday, October 4, 2014 at 5:05pm*

**Pre-Calc**

The number of pounds of apples a cannery can produce and the processing cost are P(h) = 375h and C(n) = 0.35n + 1000 where P(h) is the number of pounds of apples that can be processed in h hours and C(n) is the cost of processing n pounds of apples. Use composition of ...
*Saturday, October 4, 2014 at 10:27am*

**Pre-Calc/Trig...**

Am i correct? It is possible for a system of linear equations to have no solutions. True <-- False i think it's true, if the lines are parallel?
*Friday, October 3, 2014 at 5:47pm*

**programing**

1. Elements – sequence-series outputting Write a program that prints the following elements: 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, (hereto referred to as elements) etc., up till a user-entered value. The program should not print more than 10 numbers per line. The last line ...
*Friday, October 3, 2014 at 3:47am*

**Chemistry **

What amount of energy is required to melt a 27.4 g piece of ice at 0oC? The heat of fusion of ice = 333 Jg-1 Heat required to melt the ice 9.12e3 = J What amount of energy must be removed from 123 g of water to cool it from 71.6oC to 9.41oC? Specific heat of water = 4.184 JK-...
*Thursday, October 2, 2014 at 9:28pm*

**statistics**

c. The arrival of large jobs at a computer centre forms a Poisson process with rate 2 per hour. The service time of such jobs are exponentially distributed with mean 20 minutes. Only 4 large jobs can be accommodated in the system at a time. i. Determine the probability that a ...
*Thursday, October 2, 2014 at 3:44pm*

**Science--3 questions? :c**

15. The___hypothesis suggests that our solar system evolved from a huge rotating cloud of dust and gas. 16. Lines of____are used to measure distances east or west of the prime meridian in degrees. 17. The major difference between a topographic map and other maps is that a ...
*Thursday, October 2, 2014 at 2:46pm*

**Business Computer Information Systems**

A large department store has been attaching tags with barcodes to merchandise, and employees use barcode readers to scan merchandise at the cash register. However, the wireless barcode readers need new batteries often. Also, using this system for inventory tracking is very ...
*Thursday, October 2, 2014 at 12:55pm*

**business computer Information Systems**

A large department store has been attaching tags with barcodes to merchandise, and employees use barcode readers to scan merchandise at the cash register. However, the wireless barcode readers need new batteries often. Also, using this system for inventory tracking is very ...
*Thursday, October 2, 2014 at 12:53pm*

**businessomputer Information Systems**

A large department store has been attaching tags with barcodes to merchandise, and employees use barcode readers to scan merchandise at the cash register. However, the wireless barcode readers need new batteries often. Also, using this system for inventory tracking is very ...
*Thursday, October 2, 2014 at 12:49pm*

**Int. science**

Which of the following is an example of a cycle theme in science? seasons electrons and protons the solar system relationship between plants and animals
*Thursday, October 2, 2014 at 10:37am*

**physics**

Object A is moving due east, while object B is moving due north. They collide and stick together in a completely inelastic collision. Momentum is conserved. Object A has a mass of mA = 16.7 kg and an initial velocity of nu Overscript bar EndScripts Subscript 0A = 8.32 m/s, due...
*Thursday, October 2, 2014 at 2:58am*

**algb**

Z the Intergalactic Candy Store for $1.75. Jeejuu paid $1.88 and got 4 xylobars and 1 yackity. How much Dado pay for 1 xylobar and 2 yackities?imak bought 3 xylobars and 5 yackities from .....Write a system of equations. Then solve the equations using the methods: substitution...
*Wednesday, October 1, 2014 at 6:04pm*

**Algebra **

Write a system of equations to match each of these problems. Then solve the equations using the method... Substitution, or linear combinations. 1. Maria started her savings account with $105. She adds $10 to it each month, including the first month. Jana Rae started her ...
*Wednesday, October 1, 2014 at 6:01pm*

**Math-G7 Help please**

Write a system of equations to match each of these problems. Then solve the equations using the method... Substitution, or linear combinations. _____________________________________ 1. Dan is 4 years older than his brother Gabriel. Together their ages equal 22. How old is ...
*Wednesday, October 1, 2014 at 5:57pm*

**E.L.A. PLEASE CHECK!**

Which choice best describes the underlined word or words in each sentence? The ancient Sumerians, Egyptians, and Chinese each developed a unique system of writing. Underlined is: Sumerians Egyptians Chinese A- simple subject B- compound subject C- complete subject D- none of ...
*Wednesday, October 1, 2014 at 5:24pm*

**chemistry**

a system consisting of 1.5 mol CO2(g), initially at 15deg and 10 atm and confined to a cylinder of cross-section 10.0 cm2. it is allowed to expand adibatically against an external pressure of 1.0 atm until the piston has moved through 20 cm. assume that carbon dioxide may be ...
*Wednesday, October 1, 2014 at 2:52pm*

**science**

1) Which of the following is a valid reason why a scientist might reject a scientific theory? (1point) Some people disagree with it. It covers too broad a topic. New evidence contradicts it.*** It is too old. 2) A scientific hypothesis must be (1point) Correct Able to be ...
*Wednesday, October 1, 2014 at 2:11pm*

**Science**

-Describe the zero sum rule -True of False: The formula for the nitride ion is N^(-3) -True of False: The stock system shows the charge on the negative ion Answer this Question
*Wednesday, October 1, 2014 at 10:01am*

**Chemistry **

-Describe the zero sum rule -True of False: The formula for the nitride ion is N^(-3) -True of False: The stock system shows the charge on the negative ion
*Wednesday, October 1, 2014 at 1:14am*

**Math**

An electrician was hired to run the wires for a surround-sound stereo speaker system. She purchased 2 rolls of 14-gauge speaker wire. Each roll contains 4 m of wire. For each of 2 speakers, 2 ft. of wire are required. For each of the other 2 speakers, 11 ft. of wire are ...
*Wednesday, October 1, 2014 at 12:06am*

**Chemistry **

HELP PLEASE. I have no idea how to set this up. I tried using the q=mc(change in temp) equation but its not working out. A 59.8 g block of an unknown metal at 87.5 degrees Celsius was dropped into an insulated vesssel containing approximately 33 g of ice and 23 g of water at 0...
*Tuesday, September 30, 2014 at 7:00pm*

**Pre-Calculus/Trigonometry**

Solve the following system of equations algebraically. Verify the solution by using matrices. 8x-2y=5 -12x+3y=7
*Tuesday, September 30, 2014 at 1:23pm*

**Chemistry**

Chemistry question: Given: CH4 + 2O2 ~ CO2 + 2H2O C - H = 99 kcal O - O = 119 kcal C = O = 192 kcal O - H = 111 kcal Calculate the change in energy for the CH4 - O2 system.
*Tuesday, September 30, 2014 at 9:13am*

**physics**

This graph in the figure (Figure 1) shows how the temperature of an initially solid sample changes as time goes by when it is placed above a flame that delivers a constant heating power (that is, a fixed amount of energy input in the form of heat each second). The process ...
*Tuesday, September 30, 2014 at 3:34am*

**Pre-Calculus/Trigonometry**

Solve the following system of equations algebraically. Verify your solution by using matrices. 3x-y=0 5x+2y=22
*Monday, September 29, 2014 at 7:22pm*

**algebra2**

graph each system of equations and describe it as consistent and independent, consistent and depedneent, or inconsistent 40. x-6y=12 3x+18y=14 41. -5x-6y=13 12y+10x=-26 42. 8y-3x=15 -16y+6x=-30
*Monday, September 29, 2014 at 5:53pm*

**algebra 2**

graph each system of equations and describe it as consistent and independent, consistent and depedneent, or inconsistent 37. y=3x-4 y=6x-8 38. y=2x-1 y=2x+6 39. 2x+5y=10 -4x-10y=20
*Monday, September 29, 2014 at 5:50pm*

**algebra 2**

graph each system of equations and describe it as consistent and independent, consistent and dependent, or inconsistent 10. y+4x=12 3y=8-12x 11. -2x-3y=9 4x+6y=-18 12. 9x-2y=11 5x+4y=13
*Monday, September 29, 2014 at 5:46pm*