# Posts by Jenni

Total # Posts: 86

math trigonometry
If cos 20=m determine the values of the following in terms of m. (a) cos(-200) (b)sin 250 (c)sin 20 thanks

Calculus
what is x and cosh ln(x) when tanh(lnx^(1/2)= 12/13

Math
Make up a set of numbers having the following landmark Median 9 Range 7 mínimum 5

Math 221
6.25,16.1, and 9 is what length in meters

Math 221
What is 9/10+3/8=

Math 221
What is 5(8+v)= Please break it down for me to get a better understanding?

MATH
Mrs. Wilkerson noticed that her in-laws’ birth dates have an unusual property. Her mother-in-law was born 5-31-36, and her father-in-law was born 9-25-34. Furthermore, her hus- band’s grandfather was born 7-7-14. How many birth dates in a century have this property...

physics
a rock with a mass of 2 kg is thrown from the top of a cliff 75 m high with a velocity of 10m/s. how much Kinetic energy does it have when it gets to the bottom?

math
360

music
this the guy that directed Newbies the same guy who directed High School musical?

Organic chem 1
What is cyclopentane with a butane called?

Gen chem 1
According to the following reaction, what volume of 0.25 M CaCl2 solution is required to react exactly with 50.0 mL of 0.20 M Pb(NO3)2 solution? CaCl2(aq) + Pb(NO3) (aq)- PbCl2(s) + 2 KNO3(aq).

Chem II
Choose the aqueous solution below with the lowest freezing point. These are all solutions of nonvolitile solutes and you should assume ideal van't Hoff factors where applicable. a. 0.075 m NaI b. 0.075 m (NH4)3PO4 c. 0.075 m NaBrO4 d. 0.075 m LiCN e. 0.075 m KNO2 I can'...

vet tech
Which of the following sets of Library of Congress call numbers is in the correct order? A. E88 G2512 S57 1998, E88 G62 D225, E88 G62 L45, E88 G62 L166 1995 B. E88 G62 D225, E88 G62 L166 1995, E88 G62 L45, E88 G2512 S57 1998 C. E88 G62 L166 1995, E88 G62 L45, E88 G62 D225, E88...

chemistry
What does 1.5 fold dilution and 2.5 fold dilution mean?

biology
How do I calculate protein concentration if I know the purity is 97.3% and MW = 2666.31 kDA Thanks

biology
How do I calculate protein concentration if I know the purity is 97.3% and MW = 2666.31 kDA Thanks

chemistry
I have 3 mg/mL AMP in 50ul stock solution; How do I dilute it to 50ug in 50ul thanks you

Chem 1
Thank you Dr. Bob, you rock

Chem 1
Which one of the following electron transitions would result in the loss of energy from a hydrogen atom? a. n=1 to n=3 b. n=5 to n=3 c. n=4 to n=6 d. n=1 to n=5

Chem 1
0.266 x 0.400/0.075= 1.42 L

Chem 1
consider 400 mL of a0.266 M LiNO3 solution. To what volume must it be diluted to make a 0.075 M LiNO3 solution.

Chem 1
8x10 -2

Chem 1
Consider the following reaction. Assume that there is excess C3H7SH present. If we start with 0.5 moles O2, how many mols of SO2 can form?

math
3x-5y=24 3x+5y=6

Physics
This problem is about the work-energy theorem. What is the final speed of the particle? Express your answer in terms of K_f and M.

physics
when a 0.05kg bullet is fired into a block that is suspended by a long cord so that it can swing as a pendulum. if the block is displaced so that its centre of gravity rises by 0.10m,what was the speed of the bullet?

Chemistry
Consider the following reaction: 2NaCl(aq) + H2O(l) -> Cl2(g) + H2(g) + 2NaOH(aq) A 10.0g sample of sodium chloride was placed in 10.0 g of water. If 3.85 g of Cl2 was obtained, what was the percent yield of Cl2?

Math
Boring

poetry
name an example of alliteration in Gwendolyn McEwan's Night on Gull Lake

biology
Would you like to help me answers some of my questions in Biology? 1/ Darwin concluded that the most well adapted individuals in a population will leave the most offspring for future generations. This can be considered a measure of an individual's.. a/ phylogeny b/ family ...

math
Thank You!

math
absolute value of(x + 3) + absolute value of (3 - x) < 9. I am not sure how to go about this question. Although, we generally use three cases.

MATH
1.Graph the function f(x) = (x + 3)3 by hand and describe the end behavior.

Physics
Why?

Physics
A train is moving 50km/h east. A person is walking 5 km/h west on the train. How fast is the person on the train going relative to an observer on the earth?

math
3 (g-3) = 6 find the value of g

physics
I forgot to mention that the wagon is pulled by a force of 20 N.

physics
A 5.4 kg wagon is pulled along a horizontal surface. The acceleration of the object is 0.9 m/s^2. What is the coefficient of friction between the surfaces? Any help is much appreciated! I am not sure how to go about the problem other than I think I must use the Fn (normal ...

math
A box contains two black balls and three gold balls. Two balls are randomly drawn in succession from the box. a. If there is no replacement, what is the probability that both balls are black? b. If there is replacement before the second draw, what is the probability that both ...

Chemistry!
Determine the pH of the following, giving your answers to two decimal places. I don't know how to do these problems =( a. 0.100 M ammonia b. 0.11 M oxalic acid. Assume that dissociation resulting from Ka2 is negligible relative to that from Ka1

Chemistry!!
Determine the pH of 0.100 M aqueous HCN to two decimal places, and determine the concentration of CN- at equlibrium to two singificant figures. Can you show me all the steps to this question? Please and thank you!

Chemistry!
10.2 g of Pb(NO3)2 are dissolved in 100 mL of water, and added to 250.0 mL of a 0.250 M solution of KI. Determine the mass in grams of Pbl2 produced, and find the number of moles of the excess reagent. PLZ explain chemistry - DrBob222, Monday, December 13, 2010 at 4:30pm...

chemistry
thanks!

chemistry
Posted by Jenni on Monday, December 13, 2010 at 3:32pm. Determine the molarity of nitrate ions in a solution prepared by mixing 25.0 mL of 0.50 M Fe(NO3)3 and 35.0 mL of 1.00 M Mg(NO3)2 Please explain fully do not know where to start? chemistry - DrBob222, Monday, December 13...

CHEMISTY ...still getting it wrong, can you look again plz
6.21g/142.042 = 0.0437 2.97g/84.994 = 0.3494 M=moles/L 0.0437+0.3494/350.0= 1.12x10^-03 So I got = 1.12x10^-03 but my book says [Na+]= 0.350M Where did I go wrong?

CHEMISTY
Determine the molarity of sodium cations in solution when 6.21 g of sodium sulflate are mixed with 2.97 g of sodium nitrate in pure water to produce 350.0 mL of solution.......please explain every step. thanks!

chemistry........help!! =)
What is the molarity of ZnCl2 that forms when 30.0g of zinc completely reacts with CuCl2 according to the following reaction? Assume a final volume of 285 mL. Zn(s) + CuCl2(aq)--> ZnCl2(aq) + Cu(s) Please Explain!! Thanks!!

chemistry
What is the molarity of ZnCl2 that forms when 30.0g of zinc completely reacts with CuCl2 according to the following reaction? Assume a final volume of 285 mL. Zn(s) + CuCl2(aq)--> ZnCl2(aq) + Cu(s) Please Explain!! Thanks!!

chemistry
calculate the molarity of 70.7g C2H6O in 2.25 L of solution, can someone walk me through this and provide the right answer? please and thank you =))

Let s and t be any two whole numbers, excluding 0. True or False The statement s/t = t/s is always true? and What did you do first to answer this question?

Physics
A packing crate is placed on a 32° inclined plane. If the coefficient of static friction between the crate and the plane is 0.67, will the crate slide down the plane? What is the minimum angle to which the plane must be raised so that the crate will slide down the plane?

Math
Let s and t be any two whole numbers excluding 0. True or false. The statement s/t = t/s us always true? what did you do first to answer this question?

Math
Tina can drive 46.8 miles on \$6 worth of gasoline. Write a proportion(equation) that can be used find x the number of miles she can drive on \$25 worth of gasoline.

Physics
A 4 kg block slides down a frictionless incline making an angle of 60° with the horizontal. (a) What is the total work done on the block when the block slides 2 m (measured along the incline)? (b) What is the speed of the block after it has slid 1.5 m if it starts from ...

Physics
The outer edge of a truck tire that has a radius of 20cm has a velocity of 21 m/s. what is the angular velocity of the tire in rad/s?

math-computer

math-computer
Please help me do this question!!!!! (C): 116.98GB Assuming a disk should never get more than 85% full, and assuming you were generating 200MB of new data per week, at what point would you need to add another hard disk to this PC? How long until you have to add more storage ...

what does "getting above your raisins" mean? thanks for answer my question:)

math
thanks henry^^

math
The Houston Chronicle on January 13, 2007 reported on Texans' ticket prices to be charged Texas football fans for the 2007 season. The average Texans' ticket price will be \$60.63, an increase of \$2.88 from last year. Before the 2007 season, 22 teams increased ticket ...

Ethnic Diversity
There is alot of good information here: AMP Report – July 3, 2008 American Muslims alarmed at the new profiling policy By Abdus Sattar Ghazali American Muslim community is alarmed at the proposed Justice Department policy change that would allow the FBI to investigate ...

Math / Fractions
I am having a hard time figuring out how to solve these fraction word problems. For example: A patch of dirt needs 3 5/6 cubic yards (yd3) of concrete to cover it. If Nick decides to cover only 3/4 of the dirt . how much sod does he need. How do I work this problem? It has ...

intergers
12 + -5

chem
How does the mammalian heart control blood flow to different parts of the body?

bio
Why is nitrogen fixation necessary? How is it accomplished in nature? How can soil nitrogen be supplemented for agriculture?

spanish
How did the geography influence the immigration for the exploration in Colombia and Venezuela? How did the indegenous mix with the Europeans to develop the culture in Colombia and Venezuela?

science
i think it's like: -earth formed -water appeared on earth's surface -first vascular land plants (plants with roots and stems) -pangea forms -pangea divides -grass -earliest life (bacteria-like) - first flowering plants -forests of coal plants -first land animals -first...

science
can you please help me put these events in order from latest to earliest?: -pangea, the supercontinent, begins to divide -trilobites -dinosaur extinction -first crocodiles -archaeopteryx (early bird) -first flowering plants -protozoa (single-celled, microscopic animals) -first...

civics
ok. Thank you again!

civics
I have another queston. What is the disadvantage of a democratic government?

civics
Ok. Thank you so much!

civics
what are the advantages of a nondemocratic government?

Physics Problem
A 60 kg skydiver moving at terminal speed falls 50m in 1 s. What power is the skydiver expending on the air? This what I got so far: powerloss=weight * velocity powerloss=60kg *50m powerloss=3000 (but I don't know the units)

Physics Homework
I have a few questions that I don't understand and would like to get checked, please? 5.If energy is conserved and momentum is conserved, would they both have to be conserved simultaneously in some interaction? My answer: No because each engergy and momemtum is being ...

I had submitted a college application essay three days ago, but after I submitted it, I felt so uncomfortable with that one, because the essay was so bad, but I had to do that, it was the last day for priority application. Since I could not change anything for my application ...

Compare two college essays, everyone please come!!
I come back... and bring an new college application essay, please help me to revise the new one(the first one), and more important... to compare which one is better for my college application. If you are not good at writing, it doesn't matter, just tell me your opinions. ...

math
A right cicular cylindrical can is to be constructed to have a volume of 57.749 cubic inches (one quart). The sides of the can are to be formed by rolling and welding a strip of metal, which may be purchased in rolls with width equal to the desired height of the can. The ...

Topic of College Essay -- Draft
Any one can help me to revise this college essay? It is very important for me, your help will me invaluable for me!! Thank you! Question: At the University of Maryland, we value a diverse community. How have your life experiences and background shaped you into an individual ...

Topic of college essay
There is a question that comes from a undergraduate application: At the UM, we value a diverse community. How have your life experiences and background shaped you into an individual who will enrich the UM community? I am an immigrants from China, I came here one year ago, but ...

college essay
Yeah...The Multiculturalism is very appropriate to my idea. What I worried was, is it sounds too teminological? Anyway, now I use it. On the application form, there is only 9 lines that I can write this paragraph. I think only fit in about 100 words,so I do not know whether I ...

Application Essay
Is it better now? Is anyone can give me some suggestions other than grammar problem? For example, ideas, etc. Of course...suggestions about grammar are also welcomed Thank you so much! I was glad that I had an opportunity to be an interpreter in a Howard County event. I feel ...

College Essay
Is it better now? Anyone can give me some suggestions other than grammar problem. For example, ideas, etc. Thank you so much! I was glad that I had an opportunity to be an interpreter in a Howard County event. I feel lucky that I can speak two different languages ---- Chinese ...

college essay
Please tell me how to write better for this short Paragraph on the collge application. Thank you very much. Please choose one of the commitments that you listed above (activity, interest, or work experience) and provide a short description of its importance to you. Include why...

Accounting
Guests pay one night’s stay in advance. On receiving the advance: Dr Cash 220, Cr Advance room rental revenue 220 (liability a/c). When the guest has stayed there and checked out: Dr Advance roon rental revenue 220, Cr Room rental revenue 220 (revenue a/c). Assuming a/cs ...