Thursday
April 17, 2014

Posts by alex


Total # Posts: 2,498

chemistry
DrBob222 I am 11 years old and in sped I don't understand your answer. Please give a little more detail.

chemistry
Tungsten is a dense metal that is used to make the filaments in incandescent light bulbs. A piece of tungsten has a volume of 5.2 cubic centimeters and a mass of 100 grams. What is the density of tungsten?

physical science
3 hours

physical science
a component or assembly of components that performs a specific function

Random?
good question. i have often wondered that my self

Random?
it gives the person encouragement and a sence of accomplishment

Algebra
Could someone help me with this question Simplify the rational expression. (3x^2y+9xy^2-12y^3)/(36x^3y-27x^2y^2-9xy^3)

Algebra
Could someone help me with this question Simplify the rational expression. (3x^2y+9xy^2-12y^3)/(36x^3y-27x^2y^2-9xy^3)

Macroeconomics
What are the key elements of the scientific method and how dose this method relate to economic principles and laws?

English/General Knowledge
What are some of the social issues in today's society? I'm supposed to make an Advocacy speech to effect positive changes on a social issue.

earth science
how did cultures throughout history attempt to explain events such as volcano eruptions, earthquakes, and ecipses?

Algebra
oh I see... but can u still simplify it further by taking -1?

Algebra
Simplify the rational expression. (45y-9xy)/(x^2y-25y) I got an answer of 9(5-9x)/((x-5)(x+5)) but it seems to be wrong. Can anyone solve this for me and see what they get? Thank you

Algebra
It still shows me as wrong when I submit online

Algebra
so will the final answer be 9(5-9x)/((x-5)(x+5)) ?

Algebra
sorry what I was suppose to write was 9y(5-9x)/y((x-5)(x+5)) do you see where there is still a mistake?

Algebra
sorry what I was suppose to write was 9y(5-9x)/y((x-5)(x+5)) do you see where there is still a mistake?

Algebra
I did that u get 9y(5-9x)/((x-5)(x+5)) but it is still wrong

Algebra
Simplify the rational expression. (45y-9xy)/(x^2y-25y) I got an answer of 9y/y(x+5) but it seems to be wrong. Can anyone solve this for me and see what they get? Thank you

science
Its stellar classification, based on spectral class, is G2V, and is informally designated a yellow star, because its visible radiation is most intense in the yellow-green portion of the spectrum.[13] In this spectral class label, G2 indicates its surface temperature of approxi...

Math
I tried using the formula there, but my answer seems wrong. I end up with the integral of radical x + a weird fraction, which doesn't seem to integrate well. Am I doing something wrong or is it just a complicated problem? Thanks for the help

Math
Find the area of the surface generated by revolving the curve y = (x + 3)^1/2, 2 ≤ x ≤ 4 about the x-axis.

algebra
pliis the equivalent form indicated for each of the following fractions 7/9=?/45 and 11/5=?/35 pliis help meee

9th grade
pliis the equivalent form indicated for each of the following fractions 7/9=?/45 and 11/5=?/35 pliis help meee

College Chemistry
a)What is the theoretical yield for this reaction under the given conditions? b)What is the percent yield for this reaction under the given conditions? 1.41gH2 is allowed to react with 10.4gN2,producing 2.46gNH3

Chemistry
I got 4.6102*10^-6 and it is wrong...Can you step me through the problem?

physics
two ropes are attached to a 200. kg sled. A 490. newton dog attached to on eo the ropes applies a force of 300. N b north of the rope. A 35.0 kg dog attached to the second rope applies a force of 125 N b 36.9 degrees south of west to the rope. Calculate the net force applies t...

Algebra 2
factor 5x^2-35+60

HIS 125
• Create a timeline of four to six significant events that occurred during World War II. o Include the following in your timeline:  The year the event occurred  The name and a short description of the event  A short explanation of why the event was...

math factoring
5x^2-35+60

chemistry
labelled diagram of an experiment magnesium with oxygen

4th grade
What subject do you have to write about? If your teacher didn't give you one, pick a subject that you would like to write about :)

fractured math definitions
a chord

physic basics
Use the fact that the speed of light in a vacuum is about 3.00 x 10^8 m/s to determine how many kilometers a pulse from a laser beam travels in exactly 1.7 hour(s). i converted 1.7 hours to secs but im stuck there and i dont know what to do for the rest of the problem

English
Some islands are of the coast of Californa. What is th sbject and prepositio in this sntence?

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

bio II
what is the "transforming factor" that alters pneumonia bacteria?

math
find c from the formula h=abc when h=40, a=2, b=5

Chemistry
A sample of 8.44 grams of NaOH is dissolved into 536 mL of aqueous 0.250 M NaOH (assume no volume change). This solution is then poured into 1.96 gallons of water. You may assume that the two volumes can be added.) What is the concentration of NaOH in the final solution? Answe...

Algebra 2 Honor
On one day the value of $1.00 U.S. was equivalent to 0.77 euro. On the same day $1.00 U.S. was equivalent to $1.24 Canadian. Write the function to represent the value of Canadian dollars euros. What is the value of the function for an input of 5 rounded to nearest cent, and wh...

7th grade
What is the least common multiple of 35, 70, 140

social studies
Name two states that extend futher south than louisiana

algebra
how do you graph the function... f(x)=2^x over the interval -2 is less than or equal to x is less than or equal to 3. Help please! THANKS!

algebra
solve for r a+ar=b+r Help! Thank you.

8th grade science
science what is a control group

pre algebra
how do you complete this problem -4x+7=11

CHEMISTRY
umm DrBob222 i still dont understand wat u did.... lik is it possible for a step-by-step help?

CHEMISTRY
1. You have 88.8 mL of 2.50 M solution of Na2CrO4 (aq). You have 125 mL of a 2.50 M solution of AgNO3 (aq). Calculate the concetration of Na+ when the two solutions are added together. 2. You have 75.0 mL of 2.50 M solution of Na2CrO4 (aq). You have 125 mL of a 1.84 M solution...

Physics
Two non-parallel light rays initially converge to a single point on a screen. A rectangular block of glass is now placed somewhere in front of the screen, in the path of the light rays, so that the glass surface is parallel to the screen. Where is the new convergence point of ...

Physics
very narrow beam of white light is incident at 40.40° onto the top surface of a rectangular block of flint glass 11.8 cm thick. The indices of refraction of the glass for red and violet light are 1.637 and 1.671, respectively. Calculate the dispersion angle (i.e., the dif...

AP Physics
A rock thrown straight up with a velocity of 30 m/s from the edge of a building just misses the building as it comes down. The rock is moving at 47 m/s when it strikes the ground. How tall was the building? The accelera- tion of gravity is 9.8 m/s2 . Answer in units of m.

Confused-Math
Your calculator gives an answer of x=1.1578074156, y=2E-13 when using ROOT or ZERO in the graphing mode. Give the coordinates of the x-intercept your calculator has given you to the nearest thousandth. <<< ? I have no idea how to solve these. Someone please explain th...

math
how do you find all real and non real solutions to these type of equations?: (x+3)^2 - 81=0 (x+1)(x-2)=18 THANKS!

Math
But how do you figure out T? Out of the multiple choice answer nothing is coming close to one of the answers these are the multiple choice answers A) $2116.98 B) $18.57 C) $1857 D) $1818.44

Math
Choose the one alternative that best completes the statement or answers the question. Solve the problem. Assume that simple interest is being calculated in each case. Round your answer to the nearest cent. Martin takes out a simple-interest loan at 7.5 %. After 6 months, the ...

math
5x2=10

geometry
the endpoints of a line segment graphed on a cartesian coordinate system a (-2,6) and (1,2). what are the aoordinates of the midpoint of the segment?

Chemistry
Calculate the cell potential for the electrochemical cell consisting of Ag metal in a 0.500 M AgNO3 solution and Fe metal in a 3.0 M Fe(NO3)3 solution.

algebra
The length of a rectangular field is 18 m longer than the width. The field is enclosed with fencing and divided into two parts with a fence parallel to the shorter sides. If 216 m of fencing are required, what are the dimensions of the outside rectangle?

History
What is the outcome/results of the Genocide Rwanda conflict & what are its consequences for the UN?

Algebra
If a square handkerchief has an area of w^2+4w+4feet, what is the length of one side?

math
-35

math
resipical x/7=-5 ?

math
-15

math
multiply by the resipical 1/5p=-3

math
1/4y=-12 , 1/5p=-3 , x/7=-5

caring for scool-age childfren
for your second Q the answer is C lives with her parents,her grandm.....

caring for school -age children
for your second Q;is D is emphasizes the role......

calc
find the average rate of change on the indicated intervals f(x) = x^3 - 2x ; [0,4]

algebra
can someone pls show me how to work this 1) x+y=0 7x-7y=0 2) 2x-5y=1 3x+y=-7 3) 1/3x-4=6 x-3y=0 can someone show me how to work these please asap today thanks

social studies
These organizations have done very little on reducing tribal poverty and encouraging prosperity. As noted in our text: Today’s Native Americans are the “most undernourished, most short-lived, least educated, least healthy.” The BIA was organized to be in charge ...

ETH/ 125
Do you still need help? I have this paper I wrote for the same class, you can look over it to get some good ideas. Let me know if you still need it.

ENGLISH
What is the proper noun and common noun in this sentence. On his journey back to America, Victor sailed on the Princess.

physics
how is Gauss's Law use in determining the electric field anywhere around a point charge and how is this related to Coulomb's law?

Physics
Hello, Here is what I came up with: A) The vector pointing down is the weight from the stone on the Earth. To make the net force zero, you need to have an equally opposite force exerting itself on the stone, say the ground pushing its own force against the stone, the two force...

physics
two equally charged plates with finite length l is positioned side by side (parallel) and separated by distance d. what is the electric field intensity between the plates?

physics
consider a solid metal ball with radius r and charge q. what is the electric field intensity at the center, anywhere inside the ball and anywhere outside the ball?

chemistry
The pH of a 0.10 M salt solution is found to be 8.10. Determine the Kb and the degree of ionization of the basic ion.

Statistics
Find z such that 20.3% of the standard normal curve lies to the right of z. 0.831 0.533 -0.533 -0.257 0.257

Statistics
As x increases, does the value of r imply that y should tend to increase, decrease, or remain the same? Explain. ( Since r is zero, as x increases, y decreases. Since r is negative, as x increases, y remains the same. Since r is negative, as x increases, y decreases. Since r i...

Statistics
. Suppose a certain species of fawns between 1 and 5 months old have a body weight that is approximately normally distributed with mean kilograms and standard deviation kilograms. Let x be the weight of a fawn in kilograms. Convert the following x interval to a z interval. Rou...

Statistics
Assuming that the heights of college women are normally distributed with mean 62 inches and standard deviation 3.5 inches, what percentage of women are between 58.5 inches and 72.5 inches? (Points: 5) 34.1% 84.0% 15.7% 13.6% 97.6%

Statistics
The heights of 18-year-old men are approximately normally distributed with mean 68 inches and standard deviation 3 inches. What is the probability that the average height of a sample of ten 18-year-old men will be less than 70 inches? Round your answer to four decimal places. ...

Statistics
yes statistics it is

Jared
Suppose that x has a distribution with = 10 and = 5. If a random sample is taken of size n = 44, find . 10.00 0.75 1.51 0.11 my answer was 0.75 is this 5.00 correct

Statistics
A person's level of blood glucose and diabetes are closely related. Let x be a random variable measured in milligrams of glucose per deciliter (1/10 of a liter) of blood. Suppose that after a 12-hour fast, the random variable x will have a distribution that is approximatel...

Statistics
my answer to this is 1.519 from 0.44

Statistics
Find z such that 44.0% of the standard normal curve lies to the left of z. 0.151 -0.772 -0.151 -1.519 1.519

Statistics
my answer is 0.633 is this correct , it not exact but closer

Statistics
my answer is equals 15.7 is this correct

computers
I've figured out that the missing one the "copyright disigns and pantent act" anyway

computers
Hello everyone I have this homework about protection programs can you tell me wat these r. plz The Data protection act The Computer missuse act and one more which iv'e forgotten Can you tell me what that missing one is or wat those acts are all about. Thanks

Geography
A type of Wave P.S It's _ _ _ _ _ _ _ and it's not tsunami

Geography
A circulating current of warmer material(such as magma) P.S It is 2 words and they are _ _ _ _ _ _ _ _ _ _ / _ _ _ _ _ _ _

Geography
What do the crust and upper mantle form?

chemistry
1.40 m high

chemistry
1.40 m high

chemistry
what pressure (in atm) is exerted by a column of mercury 1.4O high? The density of mercury is 13.5951 g/cm3.

algebra
at what value of x does the perpendicular bisector of the line segment with endpoints (-2,6) and (5,-4) cross the x-axis?

Chemistry
John forgot to add the few drops of water resulting in the presence of some Mg3N2 in the final solid product. Will her reported magnesium to oxygen mole ratio be reported too high or too low? Explain. Hint: The Mg: N mass ratio is 1:0.38, and the Mg:O mass ratio is 1:0.66.

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