Thursday
April 24, 2014

Posts by aria


Total # Posts: 121

chemisrty
A solid acid is dissolved in enough water to make 200 ml of a solution. 40.0ml of the solution is titrated to a phenolphthalein en point with an NaOH solution. The neutralized solution and the remainder of the acid solution are then mixed and the PH of the resulting solution i...

chemistry
Propionic acid has a ka of 1.3x10^(-5), 50.0ml of a buffer solution having a pH of 4.65 is to be prepared using a 0.20 M solutions of propionic acid and sodium propionate. How many ml of each of these solutions must be mixed? Thanks in Advanced !

Biology
How does diving bradycardia reflex help explain why we can survive after falling into cold water and being submerged for long periods of time? Give a physiological reason that explains the relationship between lung size and body size. From a physiological perspective, why is i...

Statistics
Never mind, figured it out :)

Statistics
Two of the biggest soft drink rivals, Pepsi and Coke, are very concerned about their market shares. The pie chart that follows claims that PepsiCo's share of the beverage market is 25%. Assume that this proportion will be close to the probability that a person selected at ...

Statistics
Nevermind! I figured out what I did wrong!

Statistics
Let X be a binomial random variable with n = 100 and p = 0.2. Find approximations to these probabilities. (Round your answers to four decimal places.) P(17 < X < 28) I get the answer as 0.7059 but it is wrong. I can't seem to figure this out... Help please

Math
Is -4+2y=-2 a direct variation, and if it is what is the constant?

Biochemistry
1. What is the overall charge of the tripeptide below pH 1.0? 2. What is the overall charge of the tripeptide at pH 12? 3. What type of intermolecular attractions could the side chains of the amino acids make with the solvent (water) at pH 7.4? (Note that these are attractions...

Chemistry
100 mL of 1.0 M formic acid (HCOOH) is titrated with 1.0 M sodium hydroxide (NaOh). The Approximate pKa is 4 At the pKa, what fraction of the carboxyl group will have been converted to COO-?

Chemistry
Thank you very much!

Chemistry
Select the statements that correctly describe buffers.? 1) The pH of a buffer solution does not change significantly when any amount of a strong acid is added. 2) The Ka of a buffer does not change when any amount of an acid is added to the buffer solution. 3) The pH of a buff...

Chemistry
Thank you so much, it makes a lot more sense now! :)

Chemistry
Using the reaction and the E∘ given below 2Co^3+(aq)+2Cl^−(aq)→2Co^2+(aq)+Cl2(g) E∘=0.46 V what is the cell potential at 25 ∘C if the concentration are [Co^3+]= 0.565M , [Co^2+]= 0.554M , and [Cl^−]= 0.838M and the pressure of Cl2 is PCl2= 8...

math
use the given zero to find the remaining zeros of the function: F9x)=x^3-5x^2+4x-20; zero:2i I don't get it. Can someone please show me what to do with this?

Statistics
The number of traffic accidents per day on a certain section of highway is thought to be Poisson distributed with a mean equal 2.19. Based on this, how many traffic accidents should be expected during a week long period? a. 15.33 b. 10.95 c. approximately 10.36 d. approximatel...

Statistics
A sample of 50 values produced the following summary statistics: Q1 = 10, Q2 = 14.6, Q3 = 16.7 and x = 15.3. Based on this information, the left and right ends of the box in a box and whisker plot are, respectively, a. 10 and 14.6 b. 14.6 and 16.7 c. 10 and 16.7 d. 5.3 and 32....

Physics
A football was thrown from the line of scrimmage with a velocity of 30 m/s at an angle of 30o above the horizontal. (a) Determine the time required by the ball to reach the maximum height of its flight path. (b)Determine the distance from the line of scrimmage that a receiver ...

Physics
A 0.2 kg baseball located at the top of a building which is 100 m above the ground is thrown with an initial velocity 30 m/s at an angle of 30o above the horizontal. (a) Determine the total energy which the ball will have just after the instant that the ball is thrown. (b) Det...

Physics HELP PLZ :(
A 2.0 kg mass is placed in front of a spring (K = 40 N/m) which has been compressed to its maximum of 20.0 cm. (a)If the spring is released, determine the velocity of the mass at the instant that the spring is only compressed 10.0 cm. (b) Determine the velocity of the mass th...

Physics
During a training exercise a cannon ball is fired with a muzzle velocity of 84.9 m/s at an angle of 45o above the horizontal. Determine how far from the cannon the ball will land when it hits the ground.

Physics
A 0.22 calibre rifle shoots a bullet of mass 1.8 g with a muzzle velocity of 500 m/s. If the barrel is 25 cm long, what is the average force exerted on the bullet while it is in the barrel?

math
Cohen has consistently averaged 120 yd. of horizontal distance with his 7-iron over the last two years playing golf. His ball flight typically reaches a maximum height of 24 yd. (Hint: A rough sketch will help you) a.) Create a function in vertex form that relates these distan...

Math
Two consecutive integers are squared. The sum of these squares of these squares is 545. What are the integers?

Math
A bridge over a river is supported by an arch. The function that describes the arch us h(x) = -0.0274x^2 + 1.34033x, where h(x) is the height, in metres, of the arch above the water at any distance, x, in metres, from one end of the bridge. Could a sail boat with an 18m mast s...

Calculus
Thanks a lot, it makes so much more sense now! :)

Calculus
Differentiate x^2y^3+x^3y^4=11 implicitly to find dy/dx.

6th grade history
thank you

6th grade history
so the mound builders lived in North America???

6th grade history
Where did the mound builders live???

history
1) Romans elected leaders to make _______. 2) The ________ wrote the laws on the 12 Tables.

Biology
What are the similarities of the evolution of birds on hawaiian islands and the finches on the Galapagos?

Biology
What are the similarities of the evolution of birds on hawaiian islands and the finches on the Galapagos?

Chemistry - Half-life
Phosphene decomposes to phosphorus and hydrogen in a first order mechanism. 4PH3(g) --> P4(g) + 6H2(g) This reaction's half-life is 35.0 s at 680 degrees C. If you had 520 mmHg of phosphene in an 8.00-L flask, how long does it take for the pressure in the flask to rise ...

Math
A contact lens has a spherical shape and pretend it is being held on a finger ready to put into an eye. (All measures are in millimetres.) Suppose we take the semi-circular cross-section through the middle of the lens. Find the equation of the lens if the centrepoint of the cr...

Biology
Suppose that black hamsters were found to be 70% of the population and the gray hamsters 30% of the population. Calculate the percentage of BB, Bb, and bb hamsters in the next generation. - I don't know how to calculate the percentage of the genotypes.

chemistry
Balance each of the following redox equations using the half-reaction method. HI(s) + H2SO4 (aq) --> H2S(g) + I2 (s) My only question about this equation is...how do I know how many electrons I need to put on both sides? Other than that I know how to do it.

Chemistry
Thank you so much! :)

Chemistry
If you mix 20.0 mL of 1.00 x 10-4 mol/L NaCl with 20.0 mL of 2.00 x 10-6 mol/L AgNO3 will a precipitate form ? If it does it will be AgCl, which has a Ksp of 1.80 x 10-10. i'm not quite sure how to figure this out...

Chemistry
I'm not sure how to use the collision theory to explain the decreasing temperature, increasing concentration, and when adding a catalyst on the rate of a chemical reaction.

Chemistry
Explain, using collision theory, the effect of decreasing temperature on the rate of a chemical reaction. Explain, using collision theory, the effect of increasing concentration on the rate of a chemical reaction. Explain, using collision theory, the effect of adding a catalys...

Chemistry
A chemical reaction taking place on the surface of a block of sodium will not occur faster if the a. size of the block doubles b. block is cut in half c. surface area is increased d. amount of sodium is decreased

chemistry
Consider the following reaction: 2 NO(g) + O2(g) ---> 2 NO2(g) + energy if the number of moles of oxygen is increased to two moles, the a. reaction speeds up b. reaction slows down c. temperature increases d. temperature decreases I'm not really sure what the answer to ...

Algebra
Could someone help me reason this equation out? It stumped me. 3x +x(x-1)=0 I can only come up with 0 but I know it is more indepth than that. Thanks.

Algebra
Hi I don't understand how you are getting the y intercept. I am so confused about which numbers are solutions, vertex, x-intercepts, y-intercepts etc. Can you write out an example of an equation and how you get each number from a formula. I have been in this class for nine...

Algebra
Could someone verify if I got two answers to two problems right? f(x)=x^2-9x+15 find x and y intercepts -9+square root of 21/2,0 -9-square root of 21/2,0 x^2-x+3=0 solve and find x-intercepts (1+square root of -11/2,0) (-1-square root of -11/2,0)

PSYCHOLOGY
You are very welcome.

Algebra
Thank you for your help. I understand a whole lot more.

Algebra
Posted by Aria on Monday, August 29, 2011 at 2:58pm. This is a concept check on quadratic equation application. I am having trouble with a couple of parts. If anyone can help I would appreciate it. Suppose you are an event coordinator for a large performance theater. You need ...

algebra
With the fractions all you need to do is divide the numerator by the denominator. You will see which number is greater. Remember that negative numbers are the same as positive numbers in that they get greater as they move away from 0, only from right to left instead of left to...

Algebra
Thanks a bunch. I appreciate the detail. quadratic equations are confusing for me to graph. I no sooner think I have it than I get an answer wrong.

Algebra
This is a concept check on quadratic equation application. I am having trouble with a couple of parts. If anyone can help I would appreciate it. Suppose you are an event coordinator for a large performance theater. You need to supply information about projected ticket sales to...

algebra
Remember when using the distributive law to factor you are in fact using factoring backwards. Write each of your terms with the common multiplyer. Do you see the connection between all the numbers? What number in the equation is the base for the rest. 3,right? So write each te...

Spanish
The pronunciation is cam-bee-AYS. The answer to the second question is yes.

algebra
Thank you. I don't what to talk in class like I haven't done my homework. I did, but the two answers confused me. The second looked plausible, but I trust a university mathlab a whole lot more.

algebra
I have a question about exponents of rational expressions. I have two answers for one problem. One was written on a university mathlab and the other from a calculator. (3a^3/2)*(-7a^1/5) = -21a^17/10 (3a^3/2)*(-7a^1/5) = -21^a4/10 Can you tell me which is right? The first one ...

Science
I would suggest going online and look for articles on ion conduction experiments. Just Google ion conduction experiment scholarly articles and see what comes up.

University of Phoenix
Are you a student at the university? Have you checked the library? You can ask a librarian. Also you can go online and get financial statistics from large companies. You could also check scholarly articles on Dell finances. Finance magazines can help with that. You can usually...

English
Lizzie You have a sound and interesting speech. I would say your conclusion just needs to be an extension of your key statement in your introduction. You can make an encapsulated form of key points of your speech. Then punching in a thought provoking question at the end would ...

Ag econ
Thomas I would suggest Googeling "Precision Agriculture in the 21st century" then modify your search to include "proving marginal profitibilty. You will get good research papers from universities and agricultural organization world-wide that share detailed infor...

science
Stacey, This is a basic mathmatics problem but sounds more difficult. Draw a picture of the trail from start to finish and add and subtract on the way. What is your total distance if you travel 100m and then travel 35m more? Then, if you have traveled 100m and traveled back 35...

Algebra
I am stumped by these two LCM questions for some reason. Find The LCM for #1 2(R-7) and 14(R-7) #2 (1+4r), (1-16r^2), and (1-4r) It seems like #1 is already at the LCM and #2 would be (1+4r)(1-4r) Am I even vaguely correct? Thanks for your help.

algebra
Start with the given equation of I=700w/h^2 I=700w/72^2 Plug in Jerome's height I=700w/5184 Since we want the BMI to be between 24 and 33, we have to construct an inequality. 24=<700/5184=<33 Multiply all sides by 5184 5184*24=<700w*5184/5184=<33*5184 Once you ...

Algebra
I am having trouble with two problems. I can't seem to get a solid solution to either one of them. 3/y+5 + 6/7y add and simplify 5-r/8-r = 3/r-8 solve Can someone help me please? Thanks so much.

Algebra
Damon, Why does this explain the highest yeild? It sounds like what you did was on a graph and you found the highest points

Algebra
If the profit equation for the monthly sales of tile sets is P = -x^2 + 56x - 300, how do I find the number of tiles that yeilds the most profit. x=number of tile sets. The amount of money for costs each month is set at $300. I saw an answer as 28 tile sets would yeild the hig...

Algebra
Hi, I have had to work on several of these types of problems with no success. Could someone help me make the process easier? I have spent many hours with inconsistent results. A company offers their employees two medical insurance plans; Plan A has a $130 deductible with a 25%...

Algebra
I need help with these two problems. I need to have all of the steps shown for full credit and I get lost along the way. 6x - 2y = 10 4x + 3y = 12 solve the system by elimination. solve inequality -2(2x-6)-4x>or equal to 3x-10 + 9 It's at this point in our lessons I kee...

Algebra
Hi, I got four also, but the program I ran gave me the answer as 5x +7/6. What bothers me about the program is we have to take tests with the program and the problems don't work out to be what our workbook says. Thanks for your feedback.

Algebra
Find an equation of the line containing pair of points (1/6, 1/3) and (5/6, 3) I can't seem to figure out the slope right, which apparently is 5. How does one get a five slope out of all these fractions?!!! To find the slope 3-1/3 = 8/3 over 5/6 - 1/6 = 4/6 = 2/3 What am I...

Algebra
Hi Jess, THank you. I got 36 as the angle for the 2nd, 1st 36x2-2, the third 36+8 which adds up to 180. THe 2nd problem I got wacked out. I only get 1/2 of my graphing problems right.

Algebra
Could anybody help me with these two problems, or at least the 1st one? Thank you very much. „« The measure of the third angle of a triangle is 38 degrees more than the second angle. The measure of the first angle is two less than twice the second angle, Find the me...

Algebra
Could you explain how the amount of X does not need to be included in the inequality?

Algebra
I am having problems with inequalities. How can I express this problem as one? Derek has $750 at the start of summer and spends $65 a week for expenses. How many weeks can he withdraw expenses and still have $250 at the end of summer.

math
first you need to find the pattern. So subtract 29 from 13, 13 from 5, and 5 from 1. You then get 16,8,and 4. So the numbers are going up by 4. 16 +4 is 20. So you do 20+29=49 annd so on and so forth.

social studies
In my opinion I think people need government so there is order. We all cant have what we want so the government helps us compromise so our voices could be heard. (some forms of government that is haha)

Math
it is i think Ms. Sue just posted at the same time as you

Math
nooo its 3/5

Math
huh?

Math
its number 3 if u divide 3/5 it does not give u .5

Science (Asap)
Good job you got it!

Science (Asap)
Ms. Sue explained it nicely in the first post.

Science (Asap)
then you should tell your teacher you need help. I had the same problem in fifth grade but got help and now i love math. just letting you know.

Science (Asap)
you should really consider getting a tutor its just going to get harder :)

Poem
"She was a Phantom of delight" by W. Wordsworth

Poem
She was a Phantom of delight When first she gleamed upon my sight; A lovely Apparition, sent To be a moment's ornament; Her eyes as stars of Twilight fair; [5] Like Twilight's, too, her dusky hair; But all things else about her drawn From May-time and the cheerful Dawn...

Math
so 1/3 of 6 coins is 2. so all together the dimes are 20 cents. so 20 times 4 is 80. Kelsey has 80 cents.

vocabulary
exactly what i was thinking.. thanks!

vocabulary
Im very confused with a question i have to read a passage where a guy record his depression but I cant find the proper word in the choice that would fit this? deepening self-delusion overcoming insanity sudden enlightenment slow maturation

vocabulary
what is self delusion? the definitions online are very confusing..Can someone explain it to me in simpler terms. Also would depression be a form of self delusion?

math
Three feet in 1 yard.... 12 yds +5 yds is 17 yds... + 4ft...but there are 3 ft in 1 yard so thats an extra yard right there. 18 yds 1 ft. hope that made sense lol

Quick Question
no problemo

Quick Question
oh political unrest meaning the people are not happy with the government or whatever political party is taking over at the time. So this unrest will cause protest. and ultimately a disturbance in the amount of food in a certain country.

Quick Question
well food security according to wiki is the availability of food and one's access to it. So political unrest would threaten the amount of food for human society. It would lead to food shortages.

Algebra
Could someone tell me what I am doing right or wrong? Problem Two: 5/9 + (2/9)x = 25/7 + (6/7)x – 2/3 Like signs are not collected at the beginning. This would make the equation unequal. To make both sides equal we first multiply all sides by nine and then both sides by s...

Algebra
I cannot understand how you worked out this problem Bob. Could you explain the steps you made? Algebra - bobpursley, Wednesday, April 27, 2011 at 10:36am if it is as I wrote it, then (45x/6t)11x= 45*11*x^2/6t = 15*11*x^2/2t= 165x^2/2t Algebra - tish, Wednesday, April 27, 2011 ...

algebra
I was wondering about that approach because of the like denominators although they weren't like terms. Your method makes sense. I will go through your steps for myself and see if I can get the same answer. It may be a good idea for me to make up a similar problem and submi...

algebra
Problem Two: 5/9 + (2/9)x = 25/7 + (6/7)x – 2/3 Multiply figures inside parentheses 5/9 + (1 x 2/9x) = 25/7 + (1 x 6/7x) – 2/3 Collect like signs 5/9 + 2/9(6/7x) = 25/7 + (-2/3) Multiply like signs 2 x 6 9 7 Reduce like numbers 2 x 2 = 4x 3 7 21x Multiply number frac...

geometry
Why is the apothem of an equilateral triangle 1/3 its height?

geometry
Where is the center of an equilateral triangle? why is it there?

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