Thursday
August 28, 2014

Posts by aria


Total # Posts: 122

Calculus
Oh wow, thank you so much!
May 27, 2014

Calculus
Find all values for c in the intercal (1,4) so that the slope of the tangent line at (c,f(c)) equals the slope of the secant line through (1,1/3) and (4,2/3) where f(x) = x/(x+2) 1 </ x </ 4 (<-- that is suppose to be the less than or equal to sign) I'm not sure ...
May 27, 2014

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 ...
April 16, 2014

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 !
April 16, 2014

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 ...
March 24, 2014

Statistics
Never mind, figured it out :)
February 28, 2014

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 ...
February 28, 2014

Statistics
Nevermind! I figured out what I did wrong!
February 27, 2014

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
February 27, 2014

Math
Is -4+2y=-2 a direct variation, and if it is what is the constant?
December 2, 2013

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...
October 5, 2013

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-?
September 27, 2013

Chemistry
Thank you very much!
September 23, 2013

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 ...
September 23, 2013

Chemistry
Thank you so much, it makes a lot more sense now! :)
June 21, 2013

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...
June 21, 2013

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?
March 27, 2013

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. ...
October 10, 2012

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....
October 10, 2012

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 ...
June 24, 2012

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) ...
June 24, 2012

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 ...
June 24, 2012

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.
June 23, 2012

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?
June 22, 2012

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 ...
June 5, 2012

Math
Two consecutive integers are squared. The sum of these squares of these squares is 545. What are the integers?
June 5, 2012

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 ...
June 5, 2012

Calculus
Thanks a lot, it makes so much more sense now! :)
June 5, 2012

Calculus
Differentiate x^2y^3+x^3y^4=11 implicitly to find dy/dx.
June 5, 2012

6th grade history
thank you
May 19, 2012

6th grade history
so the mound builders lived in North America???
May 19, 2012

6th grade history
Where did the mound builders live???
May 19, 2012

history
1) Romans elected leaders to make _______. 2) The ________ wrote the laws on the 12 Tables.
May 17, 2012

Biology
What are the similarities of the evolution of birds on hawaiian islands and the finches on the Galapagos?
April 30, 2012

Biology
What are the similarities of the evolution of birds on hawaiian islands and the finches on the Galapagos?
April 30, 2012

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 ...
April 25, 2012

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 ...
April 13, 2012

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.
March 26, 2012

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.
February 25, 2012

Chemistry
Thank you so much! :)
February 21, 2012

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...
February 21, 2012

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.
February 21, 2012

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 ...
February 21, 2012

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
February 21, 2012

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 ...
February 21, 2012

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.
September 1, 2011

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...
August 31, 2011

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)
August 31, 2011

PSYCHOLOGY
You are very welcome.
August 30, 2011

Algebra
Thank you for your help. I understand a whole lot more.
August 29, 2011

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 ...
August 29, 2011

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...
August 29, 2011

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.
August 29, 2011

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...
August 29, 2011

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 ...
August 29, 2011

Spanish
The pronunciation is cam-bee-AYS. The answer to the second question is yes.
August 6, 2011

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.
August 5, 2011

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 ...
August 5, 2011

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.
August 5, 2011

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...
August 5, 2011

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 ...
August 3, 2011

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 ...
August 3, 2011

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...
August 3, 2011

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.
August 2, 2011

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 ...
August 1, 2011

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.
August 1, 2011

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
July 20, 2011

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 ...
July 20, 2011

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...
June 19, 2011

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 ...
June 9, 2011

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.
May 29, 2011

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...
May 29, 2011

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.
May 16, 2011

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 ...
May 16, 2011

Algebra
Could you explain how the amount of X does not need to be included in the inequality?
May 7, 2011

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.
May 7, 2011

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.
May 2, 2011

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)
May 2, 2011

Math
it is i think Ms. Sue just posted at the same time as you
May 2, 2011

Math
nooo its 3/5
May 2, 2011

Math
huh?
May 2, 2011

Math
its number 3 if u divide 3/5 it does not give u .5
May 2, 2011

Science (Asap)
Good job you got it!
May 2, 2011

Science (Asap)
Ms. Sue explained it nicely in the first post.
May 2, 2011

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.
May 2, 2011

Science (Asap)
you should really consider getting a tutor its just going to get harder :)
May 2, 2011

Poem
"She was a Phantom of delight" by W. Wordsworth
May 2, 2011

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...
May 2, 2011

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.
May 2, 2011

vocabulary
exactly what i was thinking.. thanks!
May 2, 2011

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
May 2, 2011

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?
May 2, 2011

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
May 2, 2011

Quick Question
no problemo
May 2, 2011

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.
May 2, 2011

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.
May 2, 2011

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 ...
April 29, 2011

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 ...
April 28, 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 ...
April 28, 2011

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 ...
April 28, 2011

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