Tuesday

September 27, 2016
Total # Posts: 214

**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*

**SCIENCE NEED HELP**

Jose buys a new moped. He travels 3 km south and then 4 km east. How far does he need to go to get back to where he started?

*February 12, 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*

**geometry**

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

*April 27, 2011*

**geometry**

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

*April 27, 2011*

**Algebra**

What is the answer in your book?

*April 27, 2011*

**algebra**

That doesn't help. That is what I put down for my answer. 2 meters every minute for 8 minutes is 16 meters. 98 - 16 = 82, sorry I put down the wrong number before. 82 is not right for some reason. On the work sheet the feedback sais this is wrong because there needs to be ...

*April 23, 2011*

**algebra**

a diver dove 94 meters and rose 2 meters every minute for 8 minutes. Where is the diver in relation to the surface? The answer to me would be 94 - 16 = 78 meters. Why is this wrong?

*April 23, 2011*

**algebra**

After looking at 50 or so of these equations the problem I seem to have is the common denominator and the multiplying the divisible by the top number on each fraction. Some of these are very simple and others are very confusing. The above I understand now.

*April 23, 2011*

**algebra**

could someone please explain to me how -5/8 + 1/4 = -3/8? I have several more of these problems -5/8 + -1/6 = -19/24, and more. I have no reference in my text on how to do these. Can someone take me through the steps?

*April 23, 2011*

**algebra**

what is the easiest way to solve a square root equation without a calculator? I have looked online and found a few, but to get the lengthy decimals or irrational numbers seems awfully confusing.

*April 16, 2011*

**algebra**

how do you find the square root of any number with long division and not a calculator? I don't like calculator readings. They are not always easy to figure out, plus math principles can't be learned with a calculator.

*April 16, 2011*

**Algebra**

Thank you. I didn't think of multiplying from left to right.

*April 15, 2011*