# Posts by David

Total # Posts: 2,325

Chemistry
What is going on in the hexane layer at the end of the Group I anion experiment? (when color of hexane layer is yellow you have Br- and when it is brown or purple you have I-.) please explain

math
63% of 105\$

Pre Cal.--Check my work?
Solve the system of equations: x - y - z = 2; x + 2y - 2z = 3; 3x - 2y - 4z = 5? well, you have: 1- x-y-z=2 2- x+2y-2z=3 3- 3x-2y-4z=5 multiply both sides of the equation 1 by 2: x-y-z=2 ===> 2x-2y-2z=4 add this by equation 2: 2x-2y-2z=4 x+2y-2z=3 ==> 3x - 4z = 7 (*) now...

Accounting
Give an example of the following tranactions •Increase an asset and increase a liability. •Increase one asset and decrease another asset. •Decrease an asset and decrease owner's equity. •Decrease an asset and decrease a liability. •Increase an ...

Find the number of possible negative real zeros for f(x)=6+x^4+2x^2-5x^3-12. Answer: 0 2) Approximate the real zeros of f(x)=2x^4-3x^2-2 to the nearest tenth. Answer: no real roots

English
hey, I am trying to write an essay for my university english class but I cannot find any good literary criticism databases. I went to mla international bibliography but couldn't find anything. I am trying to write an essay on the Fall of american dream for Of mice and men ...

MATH
Find the periodic withdrawals for the annuity of \$400,000 at 4%, paid out monthly for 16 years. (Assume end-of-period withdrawal and compounding at the same intervals as withdrawal. Round your answer to the nearest cent.)

MATH
Find the amount accumulated in the sinking fund if \$1600 is deposited quarterly for 20 years at 6% per year. (Assume end-of-period deposits and compounding at the same intervals as deposits. Round your answer to the nearest dollar.)

MATH
Find the amount accumulated in the sinking fund if \$1600 is deposited quarterly for 20 years at 6% per year. (Assume end-of-period deposits and compounding at the same intervals as deposits. Round your answer to the nearest dollar.)

MATH
Find the amount accumulated in the sinking fund if \$1600 is deposited quarterly for 20 years at 6% per year. (Assume end-of-period deposits and compounding at the same intervals as deposits. Round your answer to the nearest dollar.)

math
Convert all the fractions so that they all have the same denominator (the number below the line). That way, you can tell how big they are relative to one another just by looking at the numerator (the number above the line). (#1.) 2/5, 1/10, and 3/20 can all be converted so ...

Math
Two old watches were found. Both watches were set for the current time. Forty-five minutes later one old watch was 1 minute ahead and the other old watch was 2 minutes behind. The next morning one watch read 7am and the other read 6am. At what time were the two old watches set?

Math
1) Figure out number of grams of silver 3 kilograms X 1000 g/kilogram= 3 X 10^3 grams 2) Figure out number of atoms in 3X10^3 grams of silver 3 X 10^3 grams X 5.58 X 10^21 atoms/gram = 16.74 X 10^24 atoms or 1.674 X 10^25 atoms

Anatomy
How do we perform complex actions that apparently require no thinking?

math
I think i misunderstood the question.. is it just 1080 - 896

math
Suppose that a college admissions office needs to compare scores of students who take the Scholastic Aptitude test(SAT) wit those who take the american college test (ACT). Suppose that among the college's applicants who take the SAT, scores have a mean of 896, and a ...

MATHEMATICS
Find the amount accumulated in the sinking fund if \$1600 is deposited quarterly for 20 years at 6% per year. (Assume end-of-period deposits and compounding at the same intervals as deposits. Round your answer to the nearest dollar.)

math
Find the periodic payments necessary to accumulate \$20,000 in a sinking fund paying 4% per year, with monthly payments for 5 years. (Assume end-of-period deposits and compounding at the same intervals as deposits. Round your answer to the nearest cent.)

math
When I was considering what to do with my \$10,000 Lottery winnings, my broker suggested I invest half of it in gold, the value of which was growing by 10% per year, and the other half in CDs, which were yielding 3% per year, compounded every 6 months. Assuming that these rates...

MATH
do u tutor me for my nys test

Mathematics
Oh, these are the variable inputs. d=deposit each time period i=rate per time period n=number of time periods

Mathematics
My teacher gave us this equation, and I can't remember how to use it. It's for Simple and Compound Interest. Future Value=d[((1+i)^n-1)/i] d=deposit each time period i=rate per time period n=number of time periods

texas state
draw a supply curve for an ice parlor switching production from ice cream to yogurt.

ALGEBRA 1
the equation that passes through the given point and is parellel to the point (2,-3);2x+y=5

english
who are the two main characters in the story

Probability/Statistics
Two independent events, A and B, satisfy Pr(A) = 0.6 and Pr(B) = 0.3. In the case of Pr(A or B), why isn't the answer 0.3? We are looking at the probability of A or B. I choose B. Thank you!

Math
antiderivative of (x-2)/(x-1)

Marcoeconomics
And is the bond price=face value?

Marcoeconomics
if Bond price= the discounted value of all the future income it will generate then does it mean that the buyer of the bond earn nothing? Because he in fact need to pay the discounted value of the future income(interest) which is said to be earned by him when buying the bond. ...

Marcoeconomics
My logical deduction is: asset demand for money + transaction demand for money= money demand=supply of bond(as bond issuers create supply of bonds)

Marcoeconomics
According to the formula, Bond price= y/r so bond price has a inverse relationship with interest rate.i.e. interest rate increases, bond price decreases. But why does it contradict with this demand-supply anysis: r(interest rate increases)--> returns from buying bonds ...

Reiny! Reiny! Reiny! Answer Check and HW Help!

Engineering
Two pieces of steel are held together with six bolts. One end of the first piece of steel is welded to a beam and the second piece of steel is bolted to the first. There is a load of 54,000 pounds applied to the end of the second piece of steel. The tensile strength of steel ...

Engineering
5. Two pieces of steel are held together with six bolts. One end of the first piece of steel is welded to a beam and the second piece of steel is bolted to the first. There is a load of 54,000 pounds applied to the end of the second piece of steel. The tensile strength of ...

Engineering
Thanks bob mind helping me with one more? The questions all ready posted, same subject.

Engineering
Determine the required nominal diameter of a threaded steel rod to carry an axial load of 16,000 pounds in tension if the tensile stress of 20,000 psi is permitted.

chemistry
a 16.2 L sample of CO(g) at 1.50 atm and 200.*C is combined with 15.39g of Fe2O3(s), How many moles of CO(g) are availabe for the reaction

AP Calculus
how do you evaluate integral of [lxl] from (0,2) , a step function. would you just do it as if it were a absolute value and then do two different integrals?

Calc
find the area between y=x^3–14x^2+45x and y=–x^3+14x^2–45x i am having trouble how the graphs look like and how to do this...

chemistry
.77

statistics
The questioner doesn't want the weighted mean, she wants the mean of the difference. This is equal to the difference between the means, or 0.12.

Math
You have a mean score of 86 on 9 quizzes. The teacher decides to drop your lowest quiz score to determine your final quiz mean. After dropping the lowest score, your mean score on the 8 remaining quizzes is 88. What score was dropped?

the novel "Ordinary People" by Judith Guest
Has anybody read this book? I have a few questions to ask, I've read the book but forgotten a few things reply ASAP!

Physics
(a)M.A=2 (B)F=186.6N(C)MASS=20KG,W=173N

accounting
Are condominiums taxable or exempt

A Lesson Before Dying- Quotations Analysis. " I had gone to barbershops;I had stood on street corners, and i had gone to many suppers in the quarter.But i had never really listened to what was being said.Then i began to listen, to listen closely to how they taked about ...

Finance-options
this was an exam question...i answer for a) long call option b) long put option. But i got it wrong, the instructor won't tell us the answer, he wants us to figure it out ourselves. But i just don't know. Any guidance would be helpful.

Finance-options
I need help on the following question. Suppose that you are the manager and sole owner of ahighly leveraged company. All the debt will mature in one year. If at that time the value of the company is greater than the face value of the debt, you will pay off the debt. If the ...

Chemistry
thanks a lot !!!

Chemistry
Q1. What will be formed when propanone reacted with sodium hydrogensulphite? There is white precipitate is the resulting solution . Is it sodium carbonate? Q2. What are the difference in the products bewteen the reaction of ethanal and propanone reacting with 2,4-...

Chemistry: ketone and aldehydes
Q1. What will be formed when propanone reacted with sodium hydrogensulphite? There is white precipitate is the resulting solution . Is it sodium carbonate? Q2. What are the difference in the products bewteen the reaction of ethanal and propanone reacting with 2,4-...

Chemistry
Q1. What will be formed when propanone reacted with sodium hydrogensulphite? There is white precipitate is the resulting solution . Is it sodium carbonate? Q2. What are the difference in the products bewteen the reaction of ethanal and propanone reacting with 2,4-...

French
Please correct the verb tenses in the following paragraph Alceste, le gros copain de Nicolas, se passionne pour la nourriture. Chaque fois qu’il sort avec ses amis il a envie de manger. La semaine dernière ses amis et lui ont décidé d’aller au ...

Financial management
evaluates investment opportunities using payback. The finance director who has been with the company since its formation in 1975, has recently heard that this method may not be the best for evaluating long term projects. You have been brought in to advise the company and have ...

English
Leaving Home(the play)proves that the family structure is by far the greatest cause of people's social dysfunctioning. say why you agree or do not agree with this statement.

math help me
sorry because of misunderstood of the question. The above answer is wrong

math help me
case 1 : both bottle give red balls 1/2 * 1/2 = 1/4 case 2 : one bottle gives red ball 1/2 * 1 =1/2

chem
methanoic acid react with potassium dichromate to form what? A colorless solution and CO2 is formed as known

math
Find the first and third quartiles, Q1 and Q3, of the following set of numbers. 14, 4, 13, 18, 8, 15, 8, 3, 11, 8

math
-1/2- (-5/8)=

-9 to the 2nd power - (-6) to the 2nd power

Pharmacy Math
The dose of gentamicin sulfate is 1.7mg/kg. How many mls of an injectable solution containing 40mg/ml should be administered to a person weighing 220 pounds? Any help is appreciated.

Pharmacy Technician
A physician prescribed 5mg/kg q day of a drug for a patient that weighs 132 pounds. How many 100mg tablets will be needed for a 2-week prescription?

Need Help on this Microeconomics question, really
If firms in perfect competition all pay the same price for resources and all receive the same price for outputs, how can they have different total profits or different profits per unit sold?

Math
Make up a data set of at least 12 numbers that have the following landmarks. Maximum : 18 Range : 13 ___________________________________ ___________________________________ ____ mode: 7 median: 12

Thank you!

Thank you. I looked it up in a dictionary, but I do not understand the terminology. Can you please explain it in a simpler language? Thank you.

what is a monomer what is a polymer what is the structure of a protein

Need examples of variable and fixed inputs (micro)
I just need some example of fixed and variable inputs.

Math
Imagine there are 100 lockers. Each locker is given a number 1-100. When the students are assigned to their lockers, the 1st student runds down the row of lockers and opens every door, student #2 closes the doors of locker #'s, 2,4,6,8, etc. to the end of the line. Student...

True or False? Explain your reasoning. a. The short-run average total cost can never be less than the long-run average total cost. b. The short-run average variable cost can never be less than the long-run average total cost. c. In the long run, choosing a higher level of ...

I went to an unscramble a word site and came up with this "Zach's Word Unscrambler" Results The scrambled word you entered was "afsedrniru " ... Sorry, No Matches Were Found...

Microeconomics (margin Utility) need clarification
Someone was kind enough to help me with this question, but i was still confused on how they helped me with the first part of my question. The original question was: You go to an auction and set a maximum price of \$100 you are willing to bid on an item. However, you are ...

Thank you. I will remember the advice in the future:)

You go to an auction and set a maximum price of \$100 you are willing to bid on an item. However, you are fortunate and purchase it for \$50. 1) Does the lower price alter the marginal utility you originally placed on the item? 2) Is your potential total utility increased ...

Math
Let f(x) = 1/(x+7)+15/(x-8). Find all a for which f(a)=f(a+15). How do I solve this problem? I understand this so far f(a)=f(a+15) 1/(7+a) + 15/(a-8) = 1/(a+22) + 15/(a+7) I am lost after that This is a multiple choice question and I am not getting any of the choices a.) -161/...

Formula help
This is a multiple choice question and I am not getting any of the choices a.) -161/8 b.) 120/7 c.) 161/7 d.) -17

Formula help
Let f(x) = 1/(x+7)+15/(x-8). Find all a for which f(a)=f(a+15). How do I solve this problem?

Help
Now solve for speed of wind in the first equation.. 33km/time=32km/hr-speedwind. How do I do that?

Physics
You should start by listing the given information. vi = 0 vf = 100 m/s t = 12.5s a = (vf-vi)/t A). a = (100m/s - 0m/s)/12.5 s a = 8.00 m/s^2 B). You can use several equations for this question. I'm going to use: d = (vf + vi)/2 * t. d= (100m/s + 0m/s)/2 * 12.5 s d= 625m C...

o-chem
explain how the rate of crystal growth can affect the purity of a recrystallized compound

o-chem
explain how the rate of crystal growth can affect the purity of a recrystallized compound

o-chem
well im confused because you said one needs to be great and the other has to be poor. so if you combine both do you get a great solvent or a horrible one?

o-chem
thanks. i understand why e won't work, but im a little confused on choice a. they both dissolve a wide range of solutes so would it be a great solvent?

o-chem
Explain whether or not each of the following pairs of solvents might be useful as a solvent pair for recrystallization. (a) ethanol-methanol (b) hexane-cyclohexane (c) acetone-ethanol (d) water-ethanol (e) water-cyclohexane

O- chemistry
During a recrystalliztion experiment, a student allows the hot solution to cool to room temperature, then chills the solution in an ice bath. Is the student using correct recrystallization technique? Why does the student not simply chill the hot solution in an ice bath initially?

AP US History
1775 to 1800

Re
i need to find eveidence of 3 things that jesus did and 3 things jesus didn`t do. thanks!

grammar
What part of speech is the word "Below" used in the following sentence. Below the main level, we have a large playroom.

education
Just to take the very first term you've listed, are you suggesting that income is a characteristic of a multicultural school? What would that mean - that a multicultural school has income? And if so, is that what you're trying to say? I don't think it is, is it? Or...

Calculus
8/h -> infinity as h -> 0, so I don't see how the above expression can tend to anything other than minus infinity.

Math
Can I throw in a note of clarification? Melissa'a answers are actually correct: what's INcorrect is the algebra that apparently gave rise to them. As Bob pointed out, the "16 divided by 6" is actually a measure of inches per car, not cars per inch. Also, the ...

algebra ll
im having trouble with this problem 6( n - 4 ) = 3n

Math
No, I'm sure the problem is written like this: [(3a^3-27a)/(2a^2+13a-7)]/[9a^2/4a^2-1)] And to divide you multiply by the reciprocal. So i still don't get the problem I also know to factor, but I'm stil confused.

Math
No, I'm sure the problem is written like this: [(3a^3-27a)/(2a^2+13a-7)]/[9a^2/4a^2-1)] And to divide you multiply by the reciprocal. So i still don't get the problem I also know to factor, but I'm stil confused.

Math
I'm totally stuck on this problem!! Simplify: (2a^2+13a-7/3a^3-27a)(4a^2-1/9a^2)

Algebra II/Trig
No, Problem! Thank you so much for the answer!

Algebra II/Trig
Simplify: (n/4)/(n/m) As my answer I got: 4m Is this response correct? If not, please let me know what I did wrong.

Math check
No, you distributed the 4 to the y only. You also need to distribute the 4 to the 8. This would then make the answer 4y+32

Math
Simplify: 24w^7t^4/6w^9t^2 And How Exactly do u do this? I got 4w^16t^6