Sunday
April 20, 2014

Posts by Annie


Total # Posts: 577

Algeblease check my answer
Posted by Annie on Monday, October 18, 2010 at 7:20pm. Choose the equivalent expression(3h^-2j^3k)^2(hj^-5k^3)^-2 The signs that look like minuses are negative signs Answers: 3h^-6j^16K^-4 9h^-2j^5j^16k^-4 9h^-6j^-4k^-4 9h^-6j^-4k^-4 Please help I'm so lost right now-Ireal...

Math
I need to graph this equation y=(3/2)sin(3x+2ð)-3. What would the primary interval be for this problem and how would it appear on a graph?

Algebra
Choose the equivalent expression(3h^-2j^3k)^2(hj^-5k^3)^-2 The signs that look like minuses are negative signs Answers: 3h^-6j^16K^-4 9h^-2j^5j^16k^-4 9h^-6j^-4k^-4 Please help-I'm totally lost

English - help needed
Posted by annie on Wednesday, October 13, 2010 at 4:29pm. Are the following sentences semantically / gramatically correct? 1)Alert the supervisor to any defective material found. 2)Some equipment have been taken away for inspection. After inspection, ensure that all the equipm...

English - help needed urgently
After inspection, ensure that all equipment is accounted for using the checklist given. Is the above sentence acceptable?

English - help needed urgently
Are the following sentences semantically / gramatically correct? 1)Alert the supervisor to any defective material found. 2)Some equipment have been taken away for inspection. After inspection, ensure that all the equipment are accounted for.

English
Can you provide some examples on the use of shall versus should?

Chemistry
In reflux, water normally enters from the bottom of the condenser and exits from the top. What causes water to be able to rise to the top of the condenser? Also, I read from wikipedia website that in the case of the Allihn condenser, water enters from the top. Any idea under ...

Chemistry
In reflux, water normally enters from the bottom of the condenser and exits from the top. What causes water to be able to rise to the top of the condenser? Also, from the following website, it is stated that in the case of the Allihn condenser, water enters from the top. Any i...

English
1) Do we say "The information is correct as of 28 September 2010." or "The information is correct as at 28 September 2010."? 2) "I spoke with him yesterday." or "I spoke to him yesterday."? Someone mentioned to me that both sentences are...

Chemistry
I found the following procedure to prepare starch indicator solution on a website:- To prepare starch indicator solution, add 1 gram of starch (either corn or potato) into 10 mL of distilled water, shake well, and pour into 100 mL of boiling, distilled water. Stir thoroughly a...

Algebra
Is the answer -6? I think I got it

Algebra
How do you solve 2x^2 - 20 = 3x Thank you

Algebra
Thank you

Math help please
calculate missing dimension. square based pyramid has height 92cm and volume 5.4 m cube.

Teachers Aide/Language and other Barriers
my answer is A

Chemistry
How would you usually prepare starch indicator solution for iodine titrations? Can the solution be stored for a few months in the fridge? I noticed that sometimes the starch indicator solution in the fridge has turned cloudy, in which case we should prepare a new solution?

physic
The angular position of a point on the rim of a 45.8 cm rotating wheel is given by θ(t) = 3.6 t2 − 2.8 t +7.5, What is the instantaneous speed v of the point at time t = 6.5 s?

Chemistry problem
I refer to my earlier post on v/v versus w/w. I would be very grateful for any advice provided. For 95% ethanol purchased from manufacturer, we normally take it as 95%v/v. For 98% sulphuric acid, it seems like it is normally 98% w/w. I have also seen a potassium hydroxide 85% ...

Chemistry - v/v versus w/w
Thanks a lot:) So just to confirm: normally for any chemical bought from manufacturer, if it is not stated, the % usually means v/v? Seems like for conc sulphuric acid, when it is stated 97% sulphuric acid, it means 97% w/w sulphuric acid? Thank you very much. Posted by annie ...

Chemistry -repost thank you in advance
I have a bottle of 95% ethanol purchased from the manufacturer. Normally, when it is not stated, does it mean 95% w/w ethanol? I need to prepare 100ml of 40% v/v ethanol solution from 95% ethanol. Please show me the calculation steps. Thanks.

Chemistry- urgent help needed
How do I prepare 40% v/v from 95% ethanol? When we say 95% ethanol, do we usually mean 95% w/w ethanol unless otherwise stated? Please show me the calculation steps to prepare 40% v/v from 95% w/w ethanol. Thanks.

Chemisty - urgent
Hi, how do I do the calculation? Thanks

Chemisty - urgent
How do I prepare 30% v/v ethanol from 95% ethanol? Thanks.

Chemistry
Sorry,please ignore my earlier post. Light sensitive materials are sampled in a room with yellow lighting. How is it different from normal white light?

chemistry
Light sensitive materials are samples under yellow lighting. Please explain what yellow lighting means.

history
what presidents make up mt rushmore

ecology
Explain atmospheric circulation and seasonal changes in the sun's orientation to earth to explain the highly seasonal rainfall in the tropical dry forest and tropical savanna biomes.

ecology
Why does the rainy season in the tropical dry forest and tropical savanna biomes come during the warmer months?

math
Oh wow, yes. you are right. That does make perfect sense! Sometimes I read to much into a problem. Thank you for simplifying for me Mrs. Sue. :)

math
yes, but .49 does not seem realistic. I may be doing something wrong. Thanks

math
Ok. I pretty much have this one solved but the final answer has me stumped. The probability that Luis will pass his statistics test is 0.51. Find the probability that he will fail his statistics test. This is what I have so far. P(fail)=.51; =1-.51. But I am not sure of the fi...

Math
Yeah, I thought so just wasn't sure. Thank you!

Math
Ok. I have one more question. The mean height of 5 students is 59.4. If one of the students leaves, the mean height becomes 61. What is the height of the absent student? I have this so far but still having problems solving it: 5(59.4)=4(61)+1(X);X=? Thank you so much.

math/ algebra
ok, so my final answer is h=2, k=0, r^2=64, then r=8, is this right?

math/ algebra
Yup. That is what I got reiny. :) Thanks again.

math/ algebra
Thank you for your help! The question is what is the center and radius of the circle. (x+2)^2+y^2=64. Thank you so much.

math/linear equation
Yes, you are right! Thank you

chemistry
calculate the number of moles of carbon dioxide in a volume of 50.0 mL of carbon dioxide, assuming a pressure of 1.00 atm and a temperature of 23.0C

chemistry
dot and cross diagram of a molecule of HOCL

COLLEGE
IN A CLASS OF 100 57 STUDENTS RECEIVED A GRADE A WHAT FRACTION DID NOT RECEIVE AN A

Algebra
Evaluate a+b/10 for a=66 and b=4 a+b/10 = (simplify the answer)

math
Three pieces of wood are needed for a project. They are to be cut from a 90-cm-long piece of wood. The longest piece is to be 3 times as long as the middle-sized piece and the shortest piece is to be 10 cm shorter than the middle-sized piece. Can this be done with two cuts? If...

spanish
comer=to eat, tengo=have, yo=I

statistics
Bellevue Hospital in New York City uses 100.6 °F as the lowest temperature considered to indicate a fever. a. (0.1 point) What percentage of normal and healthy adults would be considered to have a fever? : b. (0.1 point) Does this percentage suggest that a cutoff of 100.6 ...

space
Will a lightbulb pop in space?

chemistry
A 1.00 L volume of helium gas is cooled from 50.0 degrees celcius to 25.0 degrees celcius. If the pressure remains constant, what is the final volume?

social studies
The religion of Islam (Muslums) and Christians are two different groups and cultures. Muslims are strict--can't speak to a woman until they they are engaged, yave to pary 5 times per day, women wear veils, marriages are arranaged, etc...women can't wear bathing suits.....

6th grade
what is a word for what happens when you are confused?

math
If Titanic hit an iceberg at 11:40 p.m and 2 hours and 40 minutes later it sank, what time did it sink at?

social studies
What social classes existed in Aryan culture?

math
would (3x^4/15)^2 be x^8/25 when finally simplified?

math
if you had m^0g^0 would you leave it in that form or would the simplified version be 1?

mathy
if you had m^0g^0 would you leave it in that form or would the simplified version be 1?

math :(
Last year you mowed grass and shoveled snow for 10 households. You earned $200 per household mowing for the entire season & $180 per household for shoveling the entire season. If you earned a total of $1880 last year, how many households did you mow and shovel for?! How would ...

math
I totally understand now! i had the 2x+4y=100...i just was blanking out about how to set up the 2nd part but I see now! Thank you so much! :)

math
Your teacher is giving you a test worth 100 points containing 40 questions. There are two-point and four-point questions on the test. How many of each type of question are on the test? How would you set this up?

Math
Use systems of lineear equations to solve: An airplane flew for 6 hours with a 22-km/h tail wind. The return flight against the same wind took 8 hours. Find the speed of the plane in still air. I know the answer is 154 km/hr (back of book resources :) )...I just don't unde...

physics
20(2090)(20+6)=1086800 J

Science
What is a bogus analysis using quasi-scientific jargon, but has little or no objectivity.

L.A.
is this a good beginning?!??! The movie, "Swing Kids", is not a light hearted, family film, but rather one that provokes deep emotions and thoughtful thinking within the viewer. This movie contains interesting information that shows the viewer how difficult it was fo...

space
What is the force of gravity at 220 miles above Earth's surface? Calculate how much of a g force the astronauts are actually experiencing. The solution for this math problem is a percentage. You can calculate it using the Algebraic equation: gr = R2/r2 x g R = the radius o...

which of the folling values repesents an index of
which of the folling values represents an index of refraction of an actual material

Trig
How do you find csc 163degrees 20minutes? (I didn't know how to insert the degree and minute marks)

6th grae math
how can you add and multiplication at the same time

precalculus
convert the equation y^2 = 2x -x^2 into polar form. convert the equation r = 2tan(theta) into rectangular form. I'm not really sure what either of these mean. I vaguely understand polar coordinates, but I'm not sure how to convert equations back and forth between polar...

precalculus
Two people standing 30 feet apart look east at the top of a tree. The first person looks up at an angle of 78 degrees. The second person looks up at an angle of 62 degrees. How tall is the tree (to the nearest foot)?

Algebra
Sixty-two percent of the students at Kennedy High School are involved in extra curricular activities. If 152 students are not involved in extra curricualr activities, how many students are there at Kennedy High School?

math
thanks

math
i meant what is the mass of the block?

math
what is the density of the block? density is 2700 volume is 10^-4

math
sorry Ana... i missed typed it...again i apologize

Physics
i figured it out..thanks for helping me

Physics
A block of mass m1 = 4.80 kg sits on top of a second block of mass m2 = 15.6 kg, which in turn is on a horizontal table. The coefficients of friction between the two blocks are µs = 0.300 and µk = 0.100. The coefficients of friction between the lower block and the ...

Maths
Find the equation of the normal to the curve y = 3x^2 - 5x that is perpendicular to the line y = x + 4.

Com.
1.Assignment: Negative Messages Using templates or sample documents to help you write e-mails, memos, and letters may be helpful for inexperienced writers; however, customize the communication, so the document does not appear as a form letter. Use the information in your Week ...

physics
Hey thanks! At one point I was using (3/2)R(deltaT) but I wasn't setting it equal to (DeltaQ).

physics
We start with 5.00 moles of an ideal monatomic gas with an initial temperature of 123C. The gas expands and, in the process, absorbs an amount of heat equal to 1300J and does an amount of work equal to 2040J. What is the final temperature of the gas? Use R= 8.3145J/(mol*K) for...

6th grade
The lines of latitude divide the globe into units called what?

Geography
That was pretty quick! Thank you soo much! :D

Geography
What are the capitols of the following countries? 1. Spain 2. Mexico 3. Puerto Rico 4. Peru 5. Venezuela 6. Ecuador 7. Chile 8. Uraguay 9. Argentina 10. Cuba 11. Dominican Republic 12. Bolivia 13. Colombia 14. Paraguay 15. Panama 16. Nicaragua 17. Honduras 18. Guatemala 19. Qu...

Organic Chemistry
If biphenyl dissolves in both cold and hot methanol, would this be a good recrystallization solvent for biphenyl? Explain please!!!

English
In Great Expectations, what are the three spiritual stages that Pip goes through? What changes in Pip mark each progression into the next?

Chemistry
An ion exchange process may be used to remove ions causing hardness of water. Outline how this works. 1. Ca2+ and Mg2+ are the ions that cause the hardness of water, one example of softening the water is to react the hard water with NaCO3 (Sodium bicarbonate) to soften the wat...

math
how would you solve: sin(2x)+cos(2x)=tan(x)?

physics loop
The small mass m sliding without friction along the looped track is to remain on the track at all times, even at the very top of the loop of radius r. (not unlike a roller coaster) A)In terms of the given quantities, determine the minimum release height h. (i got this to be 2....

physics
thanks! i used the two equations for w0 and set them equal to each other and solved for m and it worked! thanks!

physics imperfect spring
The force required to compress an imperfect horizontal spring an amount x is given by F= 150x+12x^3, where x is in meters and F in newtons. If the spring is compressed 2.1 m, what speed will it give to a 4.0 kg ball held against it and then released?

physics spring
the equation to use is more specifically x(t)=A(e^t*L)cos(w't) does that change it? because i'm still not getting the right answer

physics spring
but how do you find A (i'm assuming amplitude)?

physics spring
A glider on an air track is connected by springs to either end of the track. Both springs have the same spring constant,k , and the glider has mass M. A)Determine the frequency of the oscillation, assuming no damping, if k= 125N/m and M= 250g. (I got the answer to be 5.03 hz) ...

math
first, get them a common denominator (in this case 35). so (-8/7)5/5+(4/5)7/7= (-40/35)+(28/35) = (-40+28)/35 = -12/35 or so i believe

Math
take factors, beginning with the least common factors. ex: 90=3,3,10 two 3s (three squared) mean you take a three out, multiplying it by the square root of ten left.

math
would this be a correct proof of the cauchy-schwartz inequality: abs=absolute value abs(u*v) is less than or equal to abs(u)*abs(v). Then you divide both sides by abs(u)*abs(v) so that you get cos(theta) is less than or equal to 1.

Prealgebra
92% of 30 is what number

calculus
I am having alot of trouble remembering how to do this and this is a practice question for my final if you could help that would be great. Solve the differential equation (dy/dx)=(3x)/(1-x^2)

English 10 Cp
a question asked solely to produce an effect or to make an assertion and not to elicit a reply.

Chemistry
The addition of aqueous ammonia to the cathode compartment of the cell described below reduces the cell potential. Likewise, the addition of aqueous ammonia to the anode compartment increases the cell potential. Zn(s)/Zn^2+(aq)//Cu^2+/Cu(s) Assume that [Cu^2+(aq)]0=[Zn^2+(aq)]...

Chemistry
I understand this but i am confused becuase the problem uses a weak acid and strong base and the mLacid x Macid = mLbase x Mbase is for the equilibrium part put i am supposed to find the volume of titrant needed to reach the endpoint i think i am missing a concept. Please help

Chemistry
How do you calculate the volume of titrant needed to reach the endpoint of a reaction when you are given the mls and molarity of a strong base and only the molarity of a weak acid?

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