Wednesday
July 23, 2014

Posts by alex


Total # Posts: 2,543

math
I got 3 . lol hbu ?

math
Yea i know i dont get this either !!

algebra)
how do i identify the property shown in a number sentence..ex. 5x(2x4)=(5x2)x4

physics another one
A laser emitting light of wavelength 580 nm is incident on a diffraction grating. What is the maximum number of lines per centimeter for which the m=5 principal maximum will be visible

Physics help I am stuck
Monochromatic light strikes a diffraction grating at normal incidence before illuminating a screen 1.81 m away. If the first-order maxima are separated by 1.40 m on the screen, what is the distance between the two second-order maxima?

chemistry
thanks anna. i figured it out thanx 2 u.

Math
add, simplify if possible. z+r/zr^2 + 8z+r/z^2r

Math
Find all numbers for which the rational expression is undefined. m^3-8m / m^2-25

Math
Find the LCM of this 6a^4c^9, 3a^3c^7, 14a^8c^7

Math
correction: 6a^4c^9, 3a^c^7,14a^8c^9

Math
Find the LCM of this 6^4c^9, 3a^3c^7, 14a^8c^7

3rd grade
i would say c.

Math
ok if i do this that is correct 2w-4/2w = 2(w-2)/2w = w-2/w

Math
Simplify by removing factors of 1 2w-4/2w

English
oranises is supposed to be "organizes" thought u should know.

math
it took 3 hours for patrol boat to travel 48km upstream and 2 hours to travel downstream. What is the current and boat speed.

algebra
In my text book because these are practice questions it says in the question that we assume the denominator is not equal to zero

algebra
Please help on this: ^ means exponent Simplify 48y^6z^0 ___________ -8y^6 z^2

algebra
Oh yes I forgot to add the choices are... z or -z or z over z-1 or z over z+1

Physics
delta x 1 = delta x 2 / (1/sqrt(1-v^2/c^2)) would this be the correct equation to use?

Physics
A Borg cube starship is zooming past Earth with a speed v=0.97c as shown. The cube has side lengths of 3.03 km. What is its volume, measured from Earth? Can someone step me through this problem?

Physics
Have you ever wondered what to do with your unused pet while on vacation? Do you feel bad about just dumping it in some airport pet kennel and showing up again four weeks later? Do you ever wonder how to keep your pet fresh longer instead of having it age uselessly? This is wh...

College Physics
Have you ever wondered what to do with your unused pet while on vacation? Do you feel bad about just dumping it in some airport pet kennel and showing up again four weeks later? Do you ever wonder how to keep your pet fresh longer instead of having it age uselessly? This is w...

Math, Please help :/
wait but up to what number do i have to keep multiplying , like 30+.85* 2,3,4,5,6,7,8,9 - up to what number ??

Math, Please help :/
A list? but what has to go in the list?

Math, Please help :/
Okay . We should of coppied off the board when he had it today.. But whats the real answer ? 36 ?? Or 13??

Math, Please help :/
I know right. Um who do you know that would know the chart ?

Math, Please help :/
Hmm, well yesterday when i was on here someone told me that the answer was - $30 / $.85 = 35.3 or 36 videos. and i think thats right.. But idk . didnt he say we needed a chart ?

Math, Please help :/
Hmm that sounds right , But mr fuchs said that the equation was y=30 * 2.25x , So i dont know , This is confusin :/

Math, Please help :/
What are your formulas?

Math, Please help :/
I dont understand your answer, please explain more.

Math, Please help :/
At Mr.Vid's Video Rentals you can join his VId Club for a monthly membership fee pf $30. Club members pay only $.85 to rent each movie. If you are not a member of the VID club, the movies rent for $2.25 each.How many videos would you have to rent each month to make a membe...

Math
At Mr.Vid's Rentals you can join his VID Club for a monthly membership fee of $30.Club members pay only $.85 to rent each movie. If you are not a member of the VID Club, the movies rent for $2.25 each.How many videos would you have to rent each month to make a membership w...

Algebra
Express the following in simplest radical form. All variables represent positive real numbers. square root of 80a^2b divided by the square root of7a^3b^7 I got an answer of 4 square root of 5 divided by b^3 square root of 7a

us history
i agree

Chemistry (again)
What mass of NaOH is required to precipitate all the Fe2+ ions from 52.0 mL of 0.200 M Fe(NO3)2 solution?

Chemistry
Calculate the molarity of a solution made by dissolving 0.0715 mol Na2SO4 in enough water to form 550 mL of solution. While we're at it... How many milliliters of 10.6 M HCl solution are needed to obtain 0.205 mol of HCl? Also... How many grams of solute are present in 50....

math
It isn't, LOL.

math
E = Elm, M = Maple, O = Oak M = 2E O = 5E O + M + E = 32 Now you just guess & check. Try using the number 8 somewhere; I'm not going to do ALL of it.

9th grade MATH
14 + 2y = 78 78 - 14 = 64 2y = 64 64 / 2 = 32 y = 32

8th grade
the study of the physical and natural world and phenomena, especially by using systematic observation and experiment

GEOMETRY
Not enough info. Sorry.

College Physics
i got 4.11 and it was wrong, also im not sure what units to use.

Algebra
Add and subtract the rational expressions as indicated. Be sure to express your answer in simplest form ((9)/(7x)) + ((1)/(2y)) -1 I got an aswer of (16y)/(7x+2y+1)) but when I submit it shows me as wrong. Can anyone help, thanks

Chemistry
Please help I am 11 and lost.y question is a piece of tungsten has a volume of 5.2cubic centimeters and and mass of 100 grams. What is the density of tungsten? I am in sped class don't understand how to solve it.

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 ...

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