Friday
August 1, 2014

Posts by alex


Total # Posts: 2,548

math
For which table(s) of values in Exercises 39–42 is the relationship linear? Tell how you decided. Write the equation for each linear relationship. x 5 10 15 20 25 30 y 20 30 40 50 50 50 I understand this is not linear function but what is it asking me to do next.

chemistry
Calculate enthalpy change of reaction for the combustion of gaseous ethanol. C2H5OH + 3O2 >> CO2 + 3H2O. Using standard molar enthalpies of formation. C2H5OH -235.3 ( it's negative sign) CO2 -393.5 H2O -241.8 (1) Calculate the enthalpy change of reaction per mole of ...

Chemistry
given the true molar masses of CuSO4 and H2O how could you find the exact formula of the hydraye from your experimental data. Find the Value of X in the Formula CuSO4x XH2O

Chmeistry
given the true molar masses of CuSO4 and H2O how could you find the exact formula of the hydraye from your experimental data. Find the Value of X in the Formula CuSO4x XH2O

5th grade math
thanks....I haven't even been shown that way to figure it out. Thanks so much!

5th grade math
two numbers are reciprocals of each other and one of them is four times as large as the other. what are the two numbers?

Math
Try doing it with casework. Case: 1 1,9 x2 2,8 x2 3,7 x2 4,6 x2 2+2+2+2=8. That's it for case one since Diane only has one stamp for each. Case: 2 1,2,7 x6 1,3,6 x6 1,4,5 x6 2,3,5 x6 6+6+6+6=24. Case: 3 1,2,3,4 x24 The total answer is 8+24+24=56.

math
use fraction bars to find the quotient 2/9 divided by 1/6

math
Solve 2cosx-sin^x +2 =0 for all real values of x

chemistry
which of these salts is least soluble in water? 1. LiCl 2. RbCl 3. FeCl2 4. PbCl2

7th grade
just roll it and through it away

english
In the space provided, write a paragraph of cause and effect. You may use one of the topics below or one of your own choosing. Mention at least three causes and their three effects. friendship as a two-way street television and preschoolers vitamin deficiency in teenagers the ...

college
Determine the flux through a circular coil (diameter = 8.2 cm) when the magnetic field is 1.5 T and is oriented at 32.6 degrees with respect to the coil's normal.

college
what is the most important element for creating a magnetic field.

physics
what is the most important element for creating a magnetic field. and why? Moving charges..... right?

Gen Chem
Ok, how about this one? A solution contains ammonium ions and calcium along with some anions, how would you separate the ammonium ions from the calcium??

General Chemistry
Thank you DrBob222!!!

General Chemistry
if lead nitrate was added to sodium nitrate, how could one get the lead ions out of the sodium nitrate?

Chemistry
Hey guys I was wondering if you guys know the answer to this: Which of the following is NOT true of colligative properties? Colligative properties are... A. independent of the chemical identity of the solute. B. responsible for lowering the vapor pressure of a solution versus ...

Chemistry
[4 points] In a recent poll, 10 local students were asked how many beers they drink in a typical week. The responses, in no particular order, were: 4, 10, 6, 14, 12, 17, 30, 15, 12, 0 At a 90% confidence level, is there an outlier in the data given above? At a 95% confidence l...

Chemistry
2. [4 points] Serum cholesterol levels were monitored to investigate the effect of physical training. Prior to this training, blood samples were acquired from each of the 12 subjects and were tested for cholesterol level. After a week-long training period of daily running, the...

Chemistry
[6 points] You need to make a solution of Ca(NO3)2 for a class demonstration. First, you measure a quantity of the solid Ca(NO3)2 by weighing the reagent container before obtaining the sample (4.2540 ± 0.0003 g) and after taking some reagent (3.9440 ± 0.0003 g)....

English
I'm suppose to identify and label the Subject Compliments, Object Compliments, Direct Objects, and Indirect Objects in each of these sentences. I've got most of them already but I'm having trouble with just a couple. Please Help, 1. Accomplishments have no color. 2...

English
I'm suppose to identify and label the Subject Compliments, Object Compliments, Direct Objects, and Indirect Objects in each of these sentences. I've got most of them already but I'm having trouble with just a couple. Please Help, 1. Accomplishments have no color. 2...

English
I'm suppose to identify and label the Subject Compliments, Object Compliments, Direct Objects, and Indirect Objects in each of these sentences. I've got most of them already but I'm having trouble with just a couple. Please Help, 1. Accomplishments have no color. 2...

Math (fractions)
2 8/9 + 1 1/2 2 16/18 + 1 9/18 52/18 + 27/18 79/18

Calculus
You need to use the multiplication rule: y = 2 sinx cosx y' = 2 d/dx (sinx * cosx) y' = 2 [ (sinx * -sinx) + (cosx * cosx) ] y' = 2 [ -sin^2 x + cos^2 x ] y' = 2cos^2 x - 2sin^2 x

Math
A company is increasing production at the rate of 25 units per day. The daily demand function is determined by the fact that the price (in dollars) is a linear function of q. At a price of $70, the demand is 0, and 100 items will be demanded at a price of $60. Find the rate of...

ALGEBRA
3x + x(x-1)=0 3x + x^2 - x = 0 x^2 + 2x = 0 x (x - 2) = 0 x=0 x=2 There are two answers, x=0 and x=2 To find the y intercepts, set x = 0: y = 3x + x(x-1) y = 3(0) + 0(0-1) y = 0 + 0 y = 0 So the y intercept is at 0

math
Trapezoid?

math
a^2+k^2=j^2 a^2 = j^2 - k^2 a = square root ( j^2 - k^2 )

chemistry
I am using Na2S2O3.5H2O. By large amount i mean about 15 grams

chemistry
why is sodium thiosulfate readily soluble in water? how can a large amount of it be dissolved into only 3 ml of water?

Calc 2, Series/Sequences
Explain clearly in detail the difference of the summation of n=1 to infinity of 1/n^2; and the integral of 1/x^2dx with the limit of 1 to infinity, as well. Part 2: Explain the natures of the two expressions and explain why the summation is greater than the integral test. The ...

To Alex - re Math
thank you

Math
To measure the height of a building,two sightings are taken a distance of 50 feet apart. Of the first angle of elevation is 40 degrees and the second is 32 degrees, what is the height of the building?

math
A pendulum swings through an angle of 20 degrees each second. If the pendulum is 40 inches long, how far does its tip move each second?

math
what happens to the 16 inches and 14 inches.

math
The radius of each wheel of a car is 16 inches. At how many revolutions per minute should a spin balancer be set to balance the tires at a speed of 90 miles per hour? What is the setting for a wheel of radius 14 inches?

Trig.
The bearing would be 360-17.14= 342.86 due to the fact that the bearing scale is different than the unit circle.

Math
In each case, determine whether the situation calls for a discrete or continuous random variables and explain your answer.

Math
find each quotient, using long division (5x^4+14x^3+9x) / (x^2+3x+1)

4th grade math
got it. i just started mulitplying small numbers(like 3 & 4) by the numerator and denominator of 14/3(cause 14/3 is what you get when you turn mixed numders of 4 2/3 into improper fractions. so i got 42/9 & 56/12. correct?

4th grade math
ok but how do you get those?

4th grade math
write 3 different improper fractions that equal 4 2/3

chemistry
what is an example of autocatalysis? what will the graph of the rate of an autocatalytic reaction versus time look like?

physics
A series RLC circuit has a resonant frequency of 6.00 kHz. When it is driven at 8.00 kHz, it has an impedance of 1.00 k(ohm)and a phase constant of 45 degrees. What are the R (resistance), L (inductance), and C (capacitance) of the circuit?

Global History
Hitler translated his hatred into a program of genocide. How do ethnic, racial, and religious hatreds weaken society? is the answer because people believe race can create conflicts towards different gropus of race

Global History
Last question i promise. Describe Hitler's blitzkrieg tactics.

Global History
Why were Western democracies willing to give into Hitler's aggressive actions?

Global History
what was Adolf Hitler's goal during the National Socialist movement?

5th grade
To cause a commotion that could ruin a plan: rock_ _ _ _ _ _ _

probability
consider the experiment of selecting a card from an ordinary deck of 52 playing cards and determine the probability of the stated event. A card that is not a king and not a spade is drawn. I know there are 52 cards in a deck and there are 4 kings to a deck. And 13 spades in a ...

college
0 and 5 because 0 can't divide, nor be divided

biology
Why is cell culture one of the most valuable technical achievements in the entire study of biology?

Math - Calculus
Show that the equation log y = 1.54 - .008x - .658 log x is equivalent to y = 34.7 (1.0186)^(-x) * x^(-.658)

science
how long does it take to grow different fruits and vegetables? I need a chart! Please!!!

Physics
You raise a bucket of water from the bottom of a deep well. If your power output is 108 W, and the mass of the bucket and the water in it is 7.00 kg, with what speed can you raise the bucket? Ignore the weight of the rope.

Physics
Why is the centripetal force subtracted from the force of gravity? Aren't both going in the same direction (since centripetal force is always in the direction of the center of the circle)

Chemistry
I have a 1L solution of 0.02M sodium acetate and 0.02M acetic acid. What is the pH after the addition of 0.05 moles of hydrochloric acid? I know this is a buffer question but I have no idea how I am supposed to go about getting the answer... I know Ka values for acetic acid, b...

math
i'm supposed to come up with different questions for 11-12 year olds, 13-14 year olds, and 17 year olds. the topic is the triangular number sequence. any ideas for them?

science
what is the latin greek word for single PLZ HELP ME!!!

spanish
does "fin" have an accent?

Physics
Less than

Math
So the answer would be y=4x+2? Or would the 4 still be negative.

Math
Write a equation if a line through (0,2) that is perpendicular to y=-4x+6

Chemistry
.... try : .613g/136.23g/mol=.004999mol .959g/296.04g/mol=.003239mol Divide: .003239/.004999 then *100% = Percent yield =72% yield?

Chem
How us the speed of a chemical reaction related to the spontaneity of the reaction?

XACC 280 (accounting)
Nathan is a dix head.

biology
what will happen to a red blood cell placed in a solution of 99.3% water and 0.7% salt?

physics
In a rescue, the 80.0 police officer is suspended by two cables 35 degrees and 48 degrees. Find the tension in both cables?

biology
Will O2 passively diffuse and bind with hemoglobin that is less than 1mm from the surface of a blood sample? The percent of hemoglobin bound with O2 is different at high (10% CO2) and low (5% CO2) CO2 concentrations when the Po2 equals 0mmHg. Is that true?

biology
3/4

Biology
Will O2 passively diffuse and bind with hemoglobin that is less than 1mm from the surface of a blood sample? The percent of hemoglobin bound with O2 is different at high (10% CO2) and low (5% CO2) CO2 concentrations when the Po2 equals 0mmHg. Is that true?

physics
An eardrum can burst when the pressure exceeds one atmosphere and the pressure inside the ear fails to equalize. Determine the depth in seawater when this pressure would be reached. (pressure of ocean = 1.03*10^3 kg/m^3)

Chemistry 51LA
.... try : .613g/136.23g/mol=.004999mol .959g/296.04g/mol=.003239mol Divide: .003239/.004999 then *100% = Percent yield =72% yield?

Physics
When you push a 1.80-kg book resting on a tabletop, it takes 2.05 N to start the book sliding. What is the frictional force exerted on the book when you push on it with a force of 0.80 N?

PHYSICS
Consider a disk of radius 10 cm and positive surface charge density +3.7 mC/m2. A particle of charge -4.5 mC and mass 75. mg accelerates under the effects of the electric field caused by the disk, from a point at a perpendicular distance from the center of the disk. The final ...

Accounting
What is the effect on income before taxes if the aging category is changed on an accounts receivable by issuing a new invoice to customers with a revised date?

Biology
Find a recent (from 2009 June onwards) and interesting article from the mass media with a theme that is related to topics learnt in Cell Biology. So far I've learnt Membrane Structure & function,Organelles and their structure & function, as well as their membrane systems, ...

4th grade
i am a two-digit number over 50. when you put me in groups of seven, two are left over. the sum of my digits is 11. what number am i

chemistry
how do reciprocating heat engines work?

math
what is the domain, range, zeros, Initial value, sign, variation and extrema

french
Sportif

Finance
a car sells for $25000. if the rate depreciation is 15% what is the value of the car after 7 years

Grammar
Also, I'm not sure if the following sentences have run-on errors. "Houdini was born in Budapest, Hungary in 1874 when he was 4 his family immigrated to the United States." "Houdini made his name as an escape artist and magician at the turn of the century he ...

Grammar
Does the following sentence have faulty co-ordination or run-on errors? "Harry Houdini left home at the age of 12, and his real name is Erich Weiss."

MATH
HOW TO TELL if each pair of polygons are diffrent

Physics
13.6g is 0.0136kg

11th grade English
What is the timeline of chapters 13 through 18 of The Scarlet Letter? Please i need this by Tomorrow.

English
I'm looking for an artivcle by a credible news site (eg: bbc, cnn, TIME, etc). It must be about education. I'm searching for articles mostly about rote learning, and whether or not school will better prepare you for jobs, or about the school curriculum. Are there any a...

Physics
As part of a forensic test, a 5.0g lead bullet is fired into a fence post. the initial speed of the bullet is 250 m/s. when it comes to res, it is determined that half its kinetic energy had gone into heating the bullet. how much does the bullet's temperature change as a r...

physics
When people sleep, their metabolic rate is about 2.6*10^4 C/(s-kg). How many calories does a 25kg person metabolize while getting a good nights sleep of 8 hours?

Statistics
How do you determine if there's a statistically significant difference between two data sets/values? Thanks!

Finance
Forecasting Collections. Here is a forecast of sales by National Bromide for the first 4 months of 2001 (figures in thousands of dollars): Month: 1 2 3 4 Cash sales 15 24 18 14 Sales on credit 100 120 90 70 On average, 50 percent of credit sales are paid for in the current mon...

BUISNESS AND TECHNOLOGY
2. What market strategy is NASCAR using to reach its target markets

BUISNESS AND TECHNOLOGY
What market segments are the target markets of NASCAR?

BUISNESS AND TECHNOLOGY
3. Does Nike invite comments from visitors to its Web site? If so, how does this affect its attempt to build positive relationships with its customers?

BUISNESS AND TECHNOLOGY
How do the elements of the Web site reflect Nike's target market?

BUISNESS AND TECHNOLOGY
1. How does Nike's Web site help the company strengthen its relationships with its stakeholders? Give examples to support your answers

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