Saturday

February 28, 2015

February 28, 2015

Total # Posts: 378

**Algebra 1**

what is the solution of the following system of equations? 1.) 5x + 7y =3 2x = -3y +1
*February 26, 2015*

**Algebra 1**

solve each system using elimination. 1.) 6x - 3y =15 7x + 14y =10 Tell whether the system has one solution, infinitely many solutions, or no solution. 1.) 9x +8y =15 9x +8y =30 2.) 5x - 3y =10 10x + 6y = 20
*February 25, 2015*

**Algebra 1**

Thanks!
*February 25, 2015*

**Algebra 1**

Solve each system using elimination. 1.) 5x - y=0 3x + y=24 2.) 3x + 3y =27 x - 3y =-11 3.) 6x +4y =42 -3x + 3y =-6
*February 25, 2015*

**Algebra 1**

Thanks again! :)
*February 24, 2015*

**Algebra 1 **

Tell whether the system has one solution, infinitely many solutions, or no solution. 1.) y= 1/2x +3 2y -x =6 2.) x= -7y + 34 x+ 7y =32
*February 24, 2015*

**Algebra 1**

Thanks!
*February 24, 2015*

**Algebra 1**

solve each system by substitution. check your answers 4y +3 = 3y +x and 2x +4y =18
*February 24, 2015*

**chemistry **

While in Europe, if you drive 125km per day, how much money would you spend on gas in one week if gas costs 1.10 euros per liter and your car's gas mileage is 26.0mi/gal ? Assume that 1euro=1.26dollars.
*February 13, 2015*

**chemistry **

In Europe, gasoline efficiency is measured in km/L. If your car's gas mileage is 38.0mi/gal , how many liters of gasoline would you need to buy to complete a 142-km trip in Europe? Use the following conversions: 1km=0.6214mi and 1gal=3.78L.
*February 13, 2015*

**Algebra 1**

students measured the diameters and circumferences of the tops of a variety of cylinders. Below are the data that they collected. estimate the diameter of a cylinder with circumference 22cm. Cylinder Tops Diameter(cm) 3,3,5,6,8,8,9.5, 10, 10, 12 Circumference(cm) 9.3,9.5, 16, ...
*February 11, 2015*

**Physical Science**

yes I have. it doesn't show up the scientific term
*February 3, 2015*

**Physical Science**

Identify these functions galvanometer step-up transformer electric motor generator electromagnet step-down transformer commutator
*February 3, 2015*

**physics **

a child is twirling a 0.0120 kg ball on a string in a horizontal circle whose radius is 0.100m. The ball travels once around the circle in 0.500s. Determine the centripetal force acting on the ball
*December 17, 2014*

**Algebra 1**

Which ordered pai is a solution of y= -6x -7? A.(0.5,-4) B.(2,-19) C.(-2,-5) D. (3,11)
*December 16, 2014*

**Algebra**

Which property is illustrated by 45 + 19 = 19 + 45? A. Commutative property of addition B. Identity property of Addition C. Associative property of addition D. zero property of addition
*December 16, 2014*

**Algebra 1**

What is the value of the expression (-7) (3)- (5)(-3)?
*December 16, 2014*

**Algebra 1**

Thanks!
*December 16, 2014*

**Algebra 1**

It doesn't say how many.
*December 16, 2014*

**Algebra 1**

jack is taking his family to the fair. he plans to take $5 for each admission ticket plus $35 for food. Write an equation that models the amount of money jack takes to the fair.
*December 16, 2014*

**Algebra 1**

simplify (x^2 +6) - (3x^2 - 2x -5)
*December 16, 2014*

**Physical Science**

Thanks guys.
*December 10, 2014*

**Physical Science**

Fill in the blanks using the correct term from the list below. Active Combustion free heating systems passive heat pump thermal energy stroke 1. A house with large windows on its south side and few windows on its other sides probably uses a(n) Blank solar heating system. 2....
*December 10, 2014*

**Pysical Science**

Nvm it's matter
*December 10, 2014*

**Pysical Science**

The transfer of thermal energy by convention and conduction both require what? Unscramble atterm
*December 10, 2014*

**physics**

if a 175 g stationary hockey puck is struck with a force of 405 N east through a displacement of 245 mm east while in contact with a stick, determine the velocity of the puck as it leaves the stick.
*December 10, 2014*

**square feet math**

If the lenght is 14 ft. and the area is 70sq. ft.what is the width?
*December 8, 2014*

**Math**

At a swim meet, a parent is videotaping his son from a seat in the stands that is 20 meters past the starting line and 8 meters away from his son's lane. Let x represent the distance the son has swum. a. Write x as a function of (theta). b. At what angle does the parent ...
*December 7, 2014*

**Math **

Let x,y, and z be nonzero real numbers. Find all possible values of x/|x|+y/|y|+z/|z|+xyz/|xyx|.
*December 4, 2014*

**Chemistry**

Please also, help me set up this problem. Acetylene, C2H2, can be converted to ethane, C2H6, by a process known as hydrogenation. The reaction is C2H2(g)+2H2(g)⇌C2H6(g). Given the following data at standard conditions (all pressures equal to 1 atm and the common ...
*November 16, 2014*

**Chemistry**

Help me set up this problem. I have been looking at a few examples of similar problems and I keep getting the wrong answers. I'm getting really confused. Q: The standard free energy change ΔG∘ and the equilibrium constant K for a reaction can be related by the ...
*November 16, 2014*

**Physical science**

Think Critically. The mechanical advantage of a machine is less than one. Compare the distances over which the input and output forces are applied.
*October 29, 2014*

**Chemisty**

Need Boys #'s
*October 27, 2014*

**Algebra**

I got it after I post it. Thanks again.
*October 27, 2014*

**Algebra**

A 30-pack of blank CDs costs $9.50. A 50-pack of blank CDs costs $13. How can you tell which is the better buy?
*October 27, 2014*

**Physical Science**

why is the kinetic energy of the lumber higher on the truck during the delivery than when it drops from the carpenter's shoulder?
*October 22, 2014*

**Physical Science**

Thanks!
*October 22, 2014*

**Physical Science**

Explain the role friction plays in the conservation of energy.
*October 22, 2014*

**algebra**

A beauty salon buys bottles of styling gel for $4.50 per bottle and marks up the price by 40%. For what price does the salon sell each bottle?
*October 21, 2014*

**math**

the bag decreased one third, so its weight decreases the same, so: 3/4pound - 3/4 pound*1/3 =3/4pound - 1/4 pound =2/4 pound =1/2 pound
*October 21, 2014*

**Math**

4/25 = 16/100 = 16%
*October 21, 2014*

**Principles of Chemistry**

A certain amount of chlorine gas was placed inside a cylinder with a movable piston at one end. The initial volume was 3.00 L and the initial pressure of chlorine was 1.30atm . The piston was pushed down to change the volume to 1.00 L. Calculate the final pressure of the gas ...
*October 6, 2014*

**Solve. W rite each answer in simplest form.**

6/12 = 1/2
*September 16, 2014*

**Solve. W rite each answer in simplest form.**

Erin buys a bag of peanuts that weighs 3/4 of a pound. Later that week, the bag is 2/3 full. How much does the bag of peanuts weigh now? Show your work
*September 16, 2014*

**SIXTH GRADE MATH**

Sam's credit card balance is less than -$36. Does Sam owe more or less than $36? The answer he owe more than $36.
*September 2, 2014*

**sixth grade math problem**

Bertrand collects movie posters. The number of movie posters in his collection changes each month as he buys and sells posters. The table show how many posters he brought or sold in the given months. January sold 20, February bought 12, March bought 22, April sold 28. 1. Which...
*September 2, 2014*

**Absolute value**

can someone please help me with these questions?
*September 2, 2014*

**Absolute value**

Bertrand collects movie posters. The number of movie posters in his collection changes each month as he buys and sells posters. The table show how many posters he brought or sold in the given months. January sold 20, February bought 12, March bought 22, April sold 28. 1. Which...
*September 2, 2014*

**civics**

Which of the following describes a way geographic features influenced how north american countries were settled ? A. populations were greatest in inland areas where climates were more moderate. B.people settled along the borders between countries to make trade easier. C.people...
*June 4, 2014*

**math**

The test Keyshawn's class took finished at 10:30 A.M. The first part of the test took 30 minutes. There was a 15 minute break. The second part of the test also took 30 minutes. At what time did the test start?
*May 19, 2014*

**3rd grade math**

The test Keyshawn's class took finished at 10:00 A.M. The first part of the test took 30 minutes. There was a 15 minute break. The second part of the test also took 30 minutes. At what time did the test start
*May 19, 2014*

**3rd grade math**

Will arrived at his mother's office at 3 P.M. It took him 30 minutes to walk from his home to the mall. He was in the mall for 45 minutes. It then took him 15 minutes to walk to his mother's office. At what time did Will leave home?
*May 19, 2014*

**3rd grade math**

Explain how you know 6/6 and 1 are equivalent?
*April 8, 2014*

**probability **

a teacher on her way to work passes through 3 stoplights each morning. the distances between the stop lights are great and the lights operate independently of each other. if the probability of the red lights are .4,.8 and .6 for each light, what is the probability to the ...
*February 25, 2014*

**language arts**

Thank you it is!!
*February 19, 2014*

**language arts**

which of the sentences below is punctuated correctly? A.I opened the door and my cat ran outside. B.I opened the door, and my cat ran outside. C.I opened the door, my cat ran outside. I think its B
*February 19, 2014*

**science**

How often would a restriction enzyme such as Not I, which has 8 nucleotides in its recognition sites 5’-GCGGCCGC-3’, cleave DNA on average? Would it cleave a species DNA more or less often if the DNA from that species were 70% A-T rich?
*February 2, 2014*

**Physics Help**

Find components of vector -2r
*February 1, 2014*

**science**

How might the formation of Pangaea have led to mass extinctions at the end of the Permian period, about 250 million years ago?
*January 21, 2014*

**Please i needd an answer asap!!!**

Nevermind i got it. Thank you so much:)
*January 8, 2014*

**Please i needd an answer asap!!!**

A, right?
*January 8, 2014*

**Please i needd an answer asap!!!**

Ok thank you, so for number two its D? because i looked up the meaning of the word simulation and none of it matched with the the answers nor was it close
*January 8, 2014*

**Please i needd an answer asap!!!**

@Ms.Sue
*January 8, 2014*

**Please i needd an answer asap!!!**

I need a little help Ms. Sue. But for the first one i think its A For the second one C Third C
*January 8, 2014*

**Please i needd an answer asap!!!**

I give medals and 'best answer' :) I need help asap! Which of the following is one way to assess whether or not a learning game is effective? a. Being able to win the game b. doing a quiz before and after the game to see what you have learned c. Making it difficult to ...
*January 8, 2014*

**language art 8**

Please help me, i really need to get this. the only question/essay im stuck on. Answer the following questions about the essay "Escaping." Give an example of one internal and one external conflict from the selection (5 points). I need your help!
*December 9, 2013*

**physics**

A barefoot ﬁeld-goal kicker imparts a speed of 44 m/s to a football initially at rest. If the football has a mass of 0.49 kg and the time of contact with the ball is 0.028 s, what is the magnitude of the force exerted by the ball on the kicker’s foot?
*December 6, 2013*

**A/P Calculus**

A Cyclist is riding on a path whose elevation is modeled by the function f(x) = 0.08(16x-x^2) where x and f(x) are measured in miles. Find the rate of change of elecation when x=4. Would this be 0.64? dx/dt would be 1.28 - 0.16x and then plug in four?
*November 9, 2013*

**A/P Calculus**

The derivative of 0.2x is 0.2 ! ohh so when you plug in the five is it just the same outcome 00.2? f(5)=0.2?
*November 9, 2013*

**A/P Calculus**

It is a straight line slope so i would say they depend on each other so the rate of change of elevation when x=5 would be 1?
*November 9, 2013*

**A/P Calculus**

A cyclist is riding on a path whose elevation is modeled by the function F(X)=0.2x where x and f(x) arte measured in miles. Find the rate of change of elevation when x=5. ? Supposed answer: ?? 1
*November 9, 2013*

**chemistry**

3.46896 x 10e-5
*November 6, 2013*

**physics**

A scale is marked off in centimeters on a long table. A coin initially at the position labeled 130.0 is moved to the position marked -20.0. What is the displacement of the coin?
*September 11, 2013*

**chemistry**

Suppose you are asked to find the area of a rectangle that is 2.1-cm \rm cm wide by 5.6-cm \rm cm long. Your calculator answer would be 11.76 cm 2 \rm cm^2 . Now suppose you are asked to enter the answer to two significant figures. (Note that if you do not round your answer to...
*August 29, 2013*

**MATH**

Julie is solving the equation x2 + 6x + 9 = 0 and notices that the discriminant b2 - 4ac has a value of 0. This tells her that the equation has...
*May 16, 2013*

**12th grade goverment**

who could vote in elections for colonial legislatures
*May 7, 2013*

**Medical Billing and Coding**

The answer to number 18 is Medicare Part A. Part A covers hospitals. Part B covers medical. Part C was implemented so that those with part a and part b could have more options. Part D is for prescription drug plans.
*April 23, 2013*

**Medical Billing and Coding**

The answer to number 7 is the Balanced Budget Act. I'm sure you've figured that out already but I'm not sure if fellow readers with the same question are able to read other responses.
*April 23, 2013*

**chemistry**

how do i find the specific heat of a metal??
*April 16, 2013*

**Chemistry**

How much silver is present in 3.5 ml of a 1 molar silver nitrate solution?
*March 26, 2013*

**PHysics**

The sound emitted by bats has a wavelength of 3.45 mm. What is the frequency in air? The speed of sound in air is 343 m/s.
*March 21, 2013*

**Physics**

If a proton is moving in a magnetic field with a speed of 4 × 106m/s and is executing uniform circular motion with a radius of 10 cm, what is the magnetic field?
*March 21, 2013*

**Physics**

An electron with a velocity of v = (3 x + 4 y + 2 z) × 106m/s enters a region where there is both a magnetic field and an electric field. The magnetic field is B = (1 x - 2 y + 4 z)T. If the electron experiences no force as it moves, calculate the electric field.
*March 21, 2013*

**Physics**

A charged particle is moving downward with an initial speed of 5 × 106m/s when it encounters a uniform magnetic field that points east to west. (a) If the initial force on the particle is to the north, is the particle positive or negative? (b) If B = .25 T and the ...
*March 21, 2013*

**Physics**

An electron with a velocity of v = (3 x + 4 y + 2 z) × 106m/s enters a region where there is both a magnetic field and an electric field. The magnetic field is B = (1 x - 2 y + 4 z)T. If the electron experiences no force as it moves, calculate the electric field.
*March 21, 2013*

**Physics**

An electron is shot into a uniform magnetic field B = (.5 x + .8 y)T with an initial velocity of v = (4 x + 3 y) × 106m/s. What is the force on the electron?
*March 21, 2013*

**English 3**

Its "Game" by Donald Barthelme
*March 21, 2013*

**Physics**

Electric charge flows through a wire, which naturally has a cylindrical cross section. Suppose the charge has a current density given by J = A/r, where A is a constant and r is the distance to the wire's central axis. How much current flows through the wire if its radius ...
*March 18, 2013*

**Physics**

Water flows through a pipe of radius 4 cm at a rate of 3.5 m/s. Suppose each water molecule is singly ionized (highly unrealistic). What is the electric current density associated with the flow of these ions? What is the electric current in the pipe?
*March 18, 2013*

**statistics**

PLEASE HELP
*March 17, 2013*

**statistics**

Based on data from the National Center for Health Statistics, N. Wetzel used the normal distribution to model the length of gestation for pregnant US woman ( Chance, Spring 2001). Gestation length has mean of 280 days with a standard deviation of 20 days. a. Find the ...
*March 17, 2013*

**help with physics**

A bird stands on a bare power line carrying 2500 amps of current. 600 meters of this wire has a resistance of .009 ohms. If the bird's feet are 3 cm apart, what is the voltage difference between the bird's feet?
*March 4, 2013*

**help with physics**

(a) The current through a wire is a steady 2.5 amps. How much current passes through it between t = 0 seconds and t = 4 × 10-4 seconds? (b) The current through a wire is given by I(t) = I0e -at, where I0 = 2.5 amps and a = 6 × 103 s-1. How much electric charge ...
*March 4, 2013*

**help with physics**

A gold wire and a silver wire have the same dimensions. At what temperature will the silver wire have the same resistance that the gold wire has at 20°C?
*March 4, 2013*

**physics**

A 15 ohm resistor is made from a copper wire of mass 14.2 grams. What is the wire's diameter and length?
*March 4, 2013*

**Physics**

An electric filament can heat 200 cm3 of water from 5°C to 95°C in 6 minutes. If the voltage source is a 12 V battery, how much current does it draw?
*March 4, 2013*

**Physics**

A gold wire and a silver wire have the same dimensions. At what temperature will the silver wire have the same resistance that the gold wire has at 20°C?
*February 28, 2013*

**Physics**

A bird stands on a bare power line carrying 2500 amps of current. 600 meters of this wire has a resistance of .009 ohms. If the bird's feet are 3 cm apart, what is the voltage difference between the bird's feet?
*February 28, 2013*

**Physics**

(a) The current through a wire is a steady 2.5 amps. How much current passes through it between t = 0 seconds and t = 4 × 10-4 seconds? (b) The current through a wire is given by I(t) = I0e -at, where I0 = 2.5 amps and a = 6 × 103 s-1. How much electric charge ...
*February 28, 2013*

**Physics**

You have two metal spheres, one with radius 10 cm, the other 7 cm. They each possess a charge of 3 x 10-6 Coulombs. If you touch them together and let the charge come to equilibrium, how much will there be on each sphere?
*February 27, 2013*