Sunday
September 21, 2014

Posts by john


Total # Posts: 6,245

Chemistry
A student mixes 85.1 g of water at 69.6°C with 58.1 g of water at 22.0°C in an insulated flask. What is the final temperature of the combined water?
February 9, 2013

Algebra
suppose you invest $1100 at an annual interest rate of 4.3% compounded continuously. How much will you have in the account after 15 years?
February 8, 2013

Limit
(x2-27)/(x-3) as x tends to 3
February 6, 2013

Statistics
A telephone company's records indicate that private customers pay on average $17.10 per month for long-distance telephone calls. A random sample of 10 customers' bills during a given month produced a sample mean of $22.10 expended for long-distance calls and a sample ...
February 5, 2013

Statistics
Which of the following conditions doesn't need to be met before you can use a two-sample procedure? The responses in each group are independent of each other. Each group is considered to be a sample from a distinct population. The same variable is measured in both samples...
February 5, 2013

chemistry help !!!!!!!!!!!!!!!!
complete the following paragraph relating to the enzyme,b -galactosidase .this enzyme hydrolyses the disaccharide lactose to constituent monosaccharides ,galactose and glucose ,drag and drop the approprite words into the correct space. the enzyme ,B-galactosidase is added to a...
February 2, 2013

chemistry help !!!!!!!!!!!!!!!!
complete the following paragraph relating to the enzyme,b -galactosidase .this enzyme hydrolyses the disaccharide lactose to constituent monosaccharides ,galactose and glucose ,drag and drop the approprite words into the correct space. the enzyme ,B-galactosidase is added to a...
February 2, 2013

Math!!!
I have a input output table and I can't figure out the rule here is the chart X. Y _______________ 1. | 3 4. | 7 7. | 11 Can u figure it out I'm having a really hard time with this problem!!!!
January 30, 2013

Physics / Heat Transfer
How much heat must be removed from a 200 g block of copper to lower its temperature from 302 oF to 68 oF? Specific heat of copper: c = 0.092 kcal/(kg K) a. 2.4 kcal b. 2400 kcal c. 18.4 kcal d. 12 kcal e. 26 kcal
January 30, 2013

MATH
4[23 - (6 + 4)]
January 29, 2013

MATH
4[23 - (6 + 4)]
January 29, 2013

ACT/SAT MAP PREP
- t^5 u^5 v^5/ tuv =????????
January 29, 2013

math
write the number in words 84,508
January 29, 2013

computer science
Write a method printBackwards that prints an array of integers in reverse order, in the following format. For the array {1, -3, 4, 7, 2}: element [4] is 2 element [3] is 7 element [2] is 4 element [1] is -3 element [0] is 1
January 29, 2013

5th grade math
Using input output tables input 3 4 5 6 0 10. Output 9 16 25 36 0 100 what is the input output rule?
January 29, 2013

math
thank you
January 27, 2013

math
The sum of four consecutive multiples of 5 is 230. What is the greatest of these numbers ?
January 27, 2013

math
1. If 2x/5y=6,what is the value of y, in terms of x ? 2. 11/4-a=3 , What is the value of a in the equation ?
January 27, 2013

Math
Thank u :)
January 25, 2013

Math
Working with linear equations: 3(2x+1) - 4 (x+2) = 9
January 25, 2013

math help
15
January 25, 2013

nursing
For example: Kim, a neonatal ICU nurse, has cared for baby Sara for the past month. Baby Sara is about to be discharged today in good health. The baby’s parents want to give Kim a personal gift as an expression of their appreciation and have also invited Kim to the baby&#...
January 24, 2013

math
thank you , Ms.Sue
January 23, 2013

math
3. x + 11 4. H x 15
January 23, 2013

math
thank you
January 23, 2013

math
1. two times the number of windows 2. 81 increased by n 3.eleven more than a number 4. $15 times the number of hours
January 23, 2013

math
Write a variable expression for each word phrase. 1. two times the number of windows 2. 81 increased by n 3.eleven more than a number $15 times the number of hours
January 23, 2013

Math
A woman invested $15,000, part at 7% annual interest and the rest at 8%. If she earned $1,100 in income over a one-year period, how much did she invest at 7%?
January 23, 2013

Physics
Two particles are fixed along a straight line, separated by a distance 6.0 cm. The left one has a charge +2.0 nC and the right one has a charge of +6.0 nC. You must try to locate a point where the electric field is zero. (a) What is the location of the point? (b) How far from ...
January 21, 2013

chemistry help !!!!!!!!!!!!!!!!
Benzoic acid react with NH2 group Draw the product of this reaction, name the new functional group produced, state the type of reaction that has occurred, name any other products of the reaction and briefly explain how you arrived at your answer.( one or two sentences.)
January 21, 2013

Physics
True or false?equal masses of two different gases placed in containers of equal volume at equal temperature must exert equal pressures
January 21, 2013

chemistry help !!!!!!!!!!!!!!!!
Identify 4 functional group: HO-HO-BENZENE RING-CH2-CH-NH2-C=O-OH 1)carboxylic acid functional group 2)amine functional group 3)alcohol functional group i only know three is anyone can tell me the last functional group.please
January 21, 2013

chemistry help !!!!!!!!!!!!!!!!
Identify 4 functional group: O || HO CH2 C \ / \ / \ Benzen ring CH OH / | HO NH2 1)carboxylic acid functional group 2)amine functional group 3)alcohol functional group i only know three is anyone can tell me the last functional group.please
January 21, 2013

Chemistry
What mass of glucose can be produced from a photosynthesis reaction that occurs using 21.2 mol CO2? Answer in units of g
January 20, 2013

Pol 201 American National Goverment
9. The Connecticut Plan was called the Great Compromise because (Points : 1) it allowed states with larger populations to have more representatives in the House and each state to have the same number of votes in the Senate. it allowed slave states to keep their slaves. it ...
January 20, 2013

Chemistry/Calculus
Thank you, sir. However, I stillmust be doing something wrong because I am not getting the answer. My calculator will give me an error if I do it that way. On my TI-30 I punch in 2nd button, the hit Ln, then (1.00 X 10-2 / 1.65 X 10-2) and get 1.83...
January 19, 2013

Chemistry/Calculus
I have a question about how to plug in numbers on my calculator (TI-30XIIS) to get an answer. How would I put in my calculator... ln 1.00X 10-2 mol/L /1.65 X 10-2 mol/L to get-0.501? I keep getting the wrong answer...
January 19, 2013

math
1. solve for y: 2y-3<9+y 2. solve for x: 7-2x>3y
January 19, 2013

English
How did the elephant save the life oe porus.
January 19, 2013

thermal physic
What is the average translational kinetic energy of one mole Of gas molecule in an ideal gas at 37degree celsius
January 19, 2013

Chemistry
55.34g/mol^3
January 17, 2013

Chemistry
An element crystallizes in a body-centered cubic lattice. The edge of the unit cell is 2.77 , and the density of the crystal is 8.65 . Find the atomic weight of the element.
January 17, 2013

economics
How does a budget differ when you have an irregular income vs. a predictable income? irregular income is monthly budget.
January 16, 2013

economics
Jesse and Kimberly recently graduated from college and are starting a family. Currently, they are just making ends meet with their $45,000 salary. They want to contribute the maximum amount (currently $2,000) to fully fund an Educational Savings Account when their baby is born...
January 16, 2013

economics
thanks...
January 16, 2013

economics
Kimberly works for a well known financial company as a sales representative. She earns a small base salary but receives commission off every product she sells. Kimberly has basic living expenses in addition to a student loan. She wants to start adding to her Roth IRA and buy a...
January 16, 2013

Chemistry
At room temperature, ethanol's density is 0.789 g/mL while water's density is 0.997 g/mL. When a few milliliters of ethanol are added to water, the two liquids mix. A student is given a unknown liquid at room temperature and experimentally determines its density to be ...
January 16, 2013

physics
the magnitude of the tongue produced by a 3.0n force applied to a door at a perpendicular distance of 0.25 m from the hinge
January 15, 2013

Geometry
let x = witdth 4x+2 = length perimeter of rectangle = 2L + 2W substitute: 34 = 2(4x+2) +2x 34 = 8x + 4 + 2x 34-4 = 10x 10x = 30 x = 3 - width length = 4(3) + 2 = 12 + 2 = 14 :)
January 15, 2013

math
error.. that's supposed to be -10x = -1-6 -10x = -7 x = 7/10 im so sorry..
January 15, 2013

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

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