Wednesday
October 22, 2014

Posts by John


Total # Posts: 6,303

math
y = 2-4x Substituting, 3(2-4x) + 2x = -1 6-12x + 2x = -1 -10x = -1-5 -10x = -6 x = 6/10 or 3/5
January 15, 2013

PLEASE HELP ME IN THIS PHYSICS PROBLEM
A heat transfer of 9.5 x 10^5 J is required to convert a block of ice at -15°C to water at 15°C. What is the mass of the block of ice?
January 14, 2013

chemistry
how methane is produced or where it comes from?
January 14, 2013

math
If one side of a triangle is of length x and another side is of length x+6,which of the following could not be the lenght of the third side? a.5 b.7 c.9 d.11 e.13
January 13, 2013

math
The lengths of two sides of a parallelogram are 3 are 5. which of the following is a possible value for the length of a diagonal of the parallelogram? a.2 b.2 c.8 d.10 e.15
January 13, 2013

math
thank you, Reiny
January 13, 2013

pre algebra
hi i need some help
January 13, 2013

Discreete math problem
Determine the quotient q and remainder r for each of the following. where a is the dividend and b is the divisor. a=23, b=7
January 11, 2013

chemistry
1211
January 11, 2013

physics
A 2kg and a 4kg hang freely at opposite ends of a light inextensible string which passes over a small and light pulley fixed to a rigid support calculate the acceleration of the system
January 11, 2013

Math
Factor pls show me steps thank u! (X-1)(x+2)^2-(x-1)^2(x+2)
January 10, 2013

chemistry??
Oxidising and reduction- Chemistry? Oxidation and reduction can be described as the loss and/or gain of electrons from an ion or atom (species) in a chemical reaction. For thefollowing aqueous reaction, select the species that is oxidized and similarly the one that is reduced...
January 10, 2013

math
300 hundred kids attend a dance. The ratio of boys to girls is 6 to 4. If 30 boys and 20 girls leave, what is the new ratio of boys to girls still at the dance
January 10, 2013

chemistry please help
thanks
January 10, 2013

chemistry please help
The reaction between hydrogen and chlorine gases gives hydrogen chloride gas in the following reaction: H2(g) + Cl2(g) = 2HCl(g) It is found experimentally that 1 mole of H2 gas reacts with 1 mole of Cl2 gas at constant temperature and pressure, to release 184 kJ of heat. What...
January 10, 2013

chemistry hellllllllllllllllllp
you mean Al^3+ is oxidized ,Ag^+ is reduced.
January 10, 2013

PHYSICS HELP
Back in the stage coach era, iron rims were placed on wooden wheels by shrink-fitting. Suppose that the wheel has a diameter of 100.00 cm, whereas the rim has an inside diameter if 99.75 cm at 20°C. How hot must the iron rim be heated if it is to be slid over the wheel? (...
January 9, 2013

physics
A 4.75 mass was dropped from a certain height and achieved a maximum velocity of 7.68 m/s just before striking the ground. Determine the height from which the mass was dropped. Ignore air drag.
January 8, 2013

mechanical science
a c accelerates from rest in a straight line. after 12 seconds, it's velocity is measured as 42 m/s. use one of the linear equations of motion to calculate the car's acceleration
January 8, 2013

Chemistry
Chlorine gas + aqueous sodium bromide --> aqueous bromine + aqueous sodium chloride. I got: Cl2+2NaBr2(aq)-> Br2(aq)+2NaCl2(aq) Is this right ?
January 7, 2013

Ant
10. Diffusion means: a. cultural traits are expressions of our biology. b. the environment is responsible for culture change. c. cultures borrow ideas, material items, and concepts from each other. d. people are often unwilling to move to new locations.
January 6, 2013

Chemistry
Thanks
January 6, 2013

Chemistry
A radioactive element has a half-life of 6.41 days. What percent of the original sample will be left after 15.0 days?
January 6, 2013

trigonometry
A ship at A is to sail to C, 56km north and 258km east of A. After sailing N25°10’E for 120mi to P, the ship is headed toward C. Find the distance of P from C and the required course to mean C.
January 5, 2013

trigonometry
A ship at A is to sail to C, 56km north and 258km east of A. After sailing N25°10’E for 120mi to P, the ship is headed toward C. Find the distance of P from C and the required course to mean C.
January 5, 2013

Spanish
Le deseo
January 5, 2013

Probability
Mary took a 20 question multiple-choice exam where there are 4 choices for each question and only 1 of those choices is correct. Rather than reading the question, Mary simply puts a random choice of answer down for each question. Determine the probability that Mary gets ...
January 5, 2013

chemistry
can anyone give me 2 example of chiral molecules structure plz
January 5, 2013

chemistry help !!!!!!!!!!!!!!!!
H2(g)+Cl2(g)=2HCL(g) it is found experimentally that 1 mole of H2 gas react with 1 mole of CL2 gas at constant temperature & pressure , to release 184kJ of heat .what is the enthalpy change for this reaction? ∆H=
January 4, 2013

Algebra 1
23. Tom has a collection of 30 CDs and Nita has a collection of 18 CDs. Tom is adding 1 CD a month to his collection while Nita is adding 5 CDs a month to her collection. Find the number of months after which they will have the same number of CDs.
January 2, 2013

algebra 2
identify the vertex, axis of symmetry and the dirction of opening for y=-(x-6)^2-5
December 31, 2012

Help math plz
A firm is deciding whether or not to place a product on the market. They envisage three posible market reactions: high demand, moderate demand, and low demand. If demand is strong they expect to sell 200,000 a month of the good; moderate sale levels are expected to be 100,000...
December 31, 2012

History
Confucian teachings centered on harmony and order resulting from a. the end of ancestor worship b. harsh rule of chinese emperors c. the removal of Mongol influence from Chinese culture d. harmonious relationships from individuals e. meditation and prayer I think it is d but ...
December 30, 2012

basic algebra
Thankyou so much!!
December 29, 2012

basic algebra
we have to factor not solve
December 29, 2012

basic algebra
1) 2x²-7x-15 2) 9x²+24x+16 Can you show me all the steps...i dont know how to do it...Thankyou!!:)
December 29, 2012

math
HAPPY NEW YEAR!! TO ALL THE TUTORS WHO HAVE HELPED ME!! ESPECIALLY MS.SUE...I won't be on new years so am wishing earler...I apprecate all your help.. Thankyou very much!
December 27, 2012

maths help plz!
e=√d/ab make d the subject ,do not include the bracket .thanks
December 20, 2012

Language Arts
Approximately how long is the shadow of the Washington Monument at 3:00 pm in July?
December 18, 2012

Science
A skier of mass 75 kg accelerates from rest down the slope as shown in the diagram (It's a triangle with a height of 300 m, length of 400 m, and the hypotenuse is 500 m; The skier is on the hypotenuse. At the bottom of the slope, he is travelling at 40 m/s. What is the ...
December 17, 2012

Religion
The Gospel of John uses High Christology in its account of Jesus’ life. First, define High Christology. Then, describe 2 ways that John depicts Jesus using High Christology and give examples for each from the gospel.
December 16, 2012

English
Well I have some things from an article: opposition of life and death, living in order to move closer to death All life is a movement toward death, Neruda associates time with death time symbol serves as a bridge between the related themes of death and of solitude
December 16, 2012

English
Thanks for responding. I would like to know the significance of these subthemes, as I am having some trouble explaining them
December 16, 2012

English
What is meant by the subthemes: death as pervading life, time as the essence of death and self destruction, night as the environment of death, and death as the great isolator as applied to Pablo Neruda's poems, especially Residence on Earth?
December 16, 2012

Phamacology
A patient is prescribed digoxin. The patient’s apical heart rate is 58 beats per minute. What is the nurse’s best action?
December 16, 2012

social studies
What is wrong with him???? its A but one more thing............................................ ITS ME MEAT :) YOLO!!!!!!!! AGIN LOLOLOLO
December 15, 2012

Physics
The drawing shows a skateboarder moving at 6.41 m/s along a horizontal section of a track that is slanted upward by 47.4 ° above the horizontal at its end, which is 0.612 m above the ground. When she leaves the track, she follows the characteristic path of projectile ...
December 14, 2012

Physics
You are trying to lose weight by working out on a rowing machine. Each time you pull the rowing bar (which simulates the "oars") toward you, it moves a distance of 1.32 m in a time of 1.22 s. The readout on the display indicates that the average power you are ...
December 14, 2012

Chemistry
15. 120 g of sulfuric acid are added to 230.0 g of barium peroxide. Which reactant is in excess and by how much? How much barium sulfate is precipitated in this reaction???? HELP please
December 13, 2012

math
sorry,i am still not understand
December 13, 2012

math
4 students are sitting to receive the prizes.Alan and Julia wanted to sit together, how many different arrangements of students would there be ?
December 13, 2012

vocabulary
for the words listed below,write an additional word that is part of the same word family.
December 13, 2012

statistics
The mean annual income of employees who took a statistics course is greater than $60,000.
December 12, 2012

English
Are the other answers correct? Now I think he began to hear strange noises, but they didn't frighten him is a independent clause (just one and not two)
December 11, 2012

English
When the campfire was burning steadily is dependent All the campers sat on the ground around it Independent Someone began to tell a story Independent After he had been in the house for an hour or so Dependent He began to hear strange noises. Independent They didn't ...
December 11, 2012

English
What are the dependent and independent clauses in the following sentences? When the campfire was burning steadily, all the campers sat on the ground around it, and someone began to tell a scary story. After he had been in the house for an hour or so, he began to hear strange ...
December 11, 2012

John
Thanks!
December 11, 2012

John
The family planned outdoor activities for every day of vacation; however, bad weather interfered with the plans. Compound? What we learned about France made us eager to visit that country, but we don't save money quickly, so the trip will not come soon. Compound complex
December 11, 2012

John
First is simple Second is complex
December 11, 2012

John
Top sentence is complex Bottom sentence is simple
December 11, 2012

John
How about these? The most valuable of the prizes was wrapped in tattered and dirty paper. People who expect special treatment are often disappointed.
December 11, 2012

History
Does anyone know? Please!
December 11, 2012

History
Which group felt that Peter's reforms to the Russian Orthodox Church were too much change for the Church. Holy Synod Old Believers foreigners Streltsy Serfs Cossacks Not sure maybe Holy Synod but help would be greatly appreciated
December 11, 2012

Calculus
Im confused on the "There are six (and only 5)" part. and How would you solve it without the I'Hospital's Rule? We haven't learned that yet.
December 11, 2012

Calculus
The answer to the equation is -1/2. The parens are correct. But I was wrong on the limit. It is lim s->-1
December 11, 2012

Calculus
lim x->2 (((1/(sqrt(2+s))-1)/(s+1))
December 11, 2012

physics
A person exerts a force of 6.0 N at a point which is 90 cm from the hinged side of a door. If the torque is 5.2 N m then determine the angle between the force vector and the line that runs directly from the point to the hinged side.
December 11, 2012

Chemistry
please explain how % error and % yield would have effected the mass/moles of a substance in a reaction in a lab. In this case mass/moles of NaCl. NaHCO3+ HCl--> NaCl + CO2 + H2O
December 10, 2012

AP PHYSICS HELP
One piston of a hydraulic lift holds 1.40*10^3 kg. The other holds an ice block (density= 917 kg/m^3) that is 0.076 m thick. Find the first piston's area. (Cross sectional area of the ice block = cross sectional area of the piston).
December 10, 2012

math
we decided on a new logo for t-shirt,it was to be 3 stripes,each stripes could be one of 2 different colors,how many different logos could we make
December 10, 2012

Physics
In Figure 9-61, block 1 (mass 2.0 kg) is moving rightward at 8 m/s and block 2 (mass 4.8 kg) is moving rightward at 2.8 m/s. The surface is frictionless, and a spring with spring constant of 1180 N/m is fixed to block 2. When the blocks collide, the compression of the spring ...
December 10, 2012

AP PHYSICS HELP
Thanx!!!!
December 10, 2012

AP PHYSICS HELP
A 1.47 x 10^6 kg steel hull has a base that is 2.5 x 10^3 m^2 in area. If it is placed in sea water (density= 1025 kg/m^3), how deep does the hull sink?
December 10, 2012

science
Consider a single electron in a 1dimensional box with size a, What is the expected position <x> of the electron at the second excited state? What is the expected value of linear momentum at the ground state ?
December 8, 2012

Life Science
Name one plant and one animal that previously lived in Antarctica, but are now extinct throughout the entire world.
December 7, 2012

Reading
Can anyone help me with 12?
December 7, 2012

Math
When (5x^6+10x^5+2x^4+19x^3+2x^2+1)^10000 is multiplied out, what is the coefficient of x^4?
December 6, 2012

math
idk
December 5, 2012

math
anser it
December 3, 2012

math
What is the degree of the polynomial -2?
December 3, 2012

college physics
191.1
December 3, 2012

Physics
A skateboarder enters a ramp at 5 m/s, skates down it and exits at 14 m/s. What was the Height of the ramp? A. 8.7 m B. 85.5 m C. -1.2 m D. 3m E. 1.2 m Pls show work !
December 3, 2012

Physics
The work required to bend a steel beam with a spring constant of 10^6 n/m is 5 j. If it is treated like a perfect spring, what is the displacement of the beam? A. 3.2 mm b. .03 m C. 2.5m D. 0.026 m e. 0 Pls show work thank u!
December 3, 2012

Physics
A block with a mass of 2.5 kg on a frictionless track collides and sticks to a stationary block with a mass of 1.75 kg and the two more together at a velocity of 3.5 m/s. What was the velocity of the first block? A. 2.5 m/s B. 7.5 m/s C. 6.0 m/s D. 0.6 m/s E. 0 m/s pls show ...
December 3, 2012

Chemistry
What volume (in mL) of 0.45 M Na2SO4 solution is needed to precipitate all the barium, as BaSO4(s), from 14.5 mL of 0.15 M Ba(NO3)2 solution? Ba(NO3)2(aq) + Na2SO4(aq)= BaSO4(s) + 2 NaNO3(aq)
December 2, 2012

Chemistry
Never mind. I got it
December 2, 2012

Chemistry
How many grams of CuCl2 are required to prepare 1270. g of a 1.75% (by mass) CuCl2 solution?
December 2, 2012

Chemistry
What's the linear density of body center cubic (0,1,1)of Molybdenum
November 29, 2012

chemistry
How would you prepare the following solution? a)2% NaCL(w/v) b).35M glucose C)0.12M CaCl2 For b I got glucose 0.35=wt/180=63gm/L, but not sure if I'm doing it right.
November 29, 2012

Physics 1
A catapult 100 m long launches a 3.0 x 10^4 kg jet from the deck of a carrier. Starting at rest, the plane takes off with a speed of 80 m/s. Find: a)The acceleration, b) the average force, c) the work done, d) time to accelerate , e) the power developed.
November 28, 2012

Pre-calculus
what does sqrt mean?
November 27, 2012

Pre-calculus
You are given a 12"x18" piece of construction paper. You are to cut a square out of each corner in order to create a 3-dimensional open-top box. What size squares would you need to cut in order to maximize the volume of the box?
November 27, 2012

physics
tyvm :)
November 27, 2012

physics
Air consists of molecules of several types, with an average molar mass of 28.95 g. An adult who inhales 0.6 L of air at sea level takes in about how many molecules? (The density of air is 1.229 kg/m^3, and the molar mass of air is 28.95 g/mol.)
November 27, 2012

math
4x+3=15
November 26, 2012

math
write a situation with a algebraic exprassion that can reprsened x+3
November 26, 2012

Science
A car speeds over the top of a hill. If the radius of curvature of the hill at the top is 14.27 m, how fast can the car be traveling and maintain constant contact with the ground?
November 26, 2012

MATH PLEESE HELP ITS URGENT
A is 11 by 11 B is 11 by 13 c is 13 by 13 total area is 433 m2 area of B is 143 m2 total perimeter is 96 m
November 26, 2012

Chemistry
How many moles of CO2 would be expected to be produced from 0.00639 moles of sodium carbonate?
November 26, 2012

physics
A helicopter flies over the arctic ice pack at a constant altitude, towing an airborne 195-kg laser sensor which measures the thickness of the ice (see the drawing). The helicopter and the sensor move only in the horizontal direction and have a horizontal acceleration of ...
November 25, 2012

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