Friday

January 30, 2015

January 30, 2015

Total # Posts: 178

**Chemistry**

How to Prepare a 50 mM pH 6 Citrate buffer starting from citric acid as the sole source of conjugate base.
*January 17, 2015*

**Chemistry**

How to perform a pH Titration of 25 ml of 50 mM Phosphoric acid from pH 1 to pH 13 with 1 N NaOH (including standardizing the NaOH).
*January 17, 2015*

**Chemistry**

Thanks for that information but how do you do a pH vs Temp graph for this? Because, I need to do the calculations and a graph of pH vs Temp? (Even if it's just an example or formulas it'd be very helpful and well appreciated.)
*January 16, 2015*

**Chemistry**

Well neither did my teacher that's why I'm confused to begin with.
*January 16, 2015*

**Chemistry**

How to make 100 mL of 100mM of Tris HCl and 100 mL of 100mM of Tris Base. Follow the pH of the resulting combined solution as it is heated from 0 to 50 degrees Celsius.
*January 16, 2015*

**Physics 10 (helppp please) thannnks **

A sagging floor is jacked up and a steel girder 10 ft long whose cross sectional area is 6in^2 is put underneath. When the jack is removed, a strain gauge shows that the girder has been compressed by 0.0080in. Find the weight the girder is supporting in lbs and tons.
*January 14, 2015*

**Physic**

The right hand rule is used to determine the direction of the magnetic force on a positive charge.
*January 14, 2015*

**Physics**

Thanks, so that's why I cant solve it. :(
*January 13, 2015*

**Physics**

a wire 100 cm long and 0.2 cm in diameter is suspended from a support. a 10 kg mass is hung from the lower end of the wire. a find the stress b find the strain c young's modulus of elasticity
*January 13, 2015*

**Physics grade 10**

john is walking at such speed so that his kinetic energy is 20 J, what is his speed? It started to rain John runs at a rate of 4.2 m/s find the change in KE.
*December 13, 2014*

**college algebra**

A rectangle picture frame has a perimeter of 1800 centimeters and a width that is 300 less than its length. Find the area of the picture.
*November 20, 2014*

**maths**

maria gave two fifths of her stickers to susan but still had 18 left. how many did she give susan. thats my homework question and i dont understand how i find out the answer
*November 6, 2014*

**Chemistry**

The boiling point of diethyl ether CH3CH2OCH2CH3 is 34.500C at 1 atmosphere. A nonvolatile, nonelectrolyte that dissolves in diethyl ether is cholesterol . How many grams of cholesterol, C27H46O (386.6 g/mol), must be dissolved in 208.0 grams of diethyl ether to raise the ...
*October 5, 2014*

**algebra**

Jim has some nickels, dimes and quarters worth $5.30. There are five times as many dimes as quarters, and six more nickels than dimes. How many of each kind of coin does he have?
*September 9, 2014*

**trigonomertry math**

If cos A=1/3 and tan A<0,determine the value of 2sin A+tan A without the use of a calculator
*May 20, 2014*

**Language Arts - Grammar - please check answers**

is #4 'was'? is #6 'was'? is #7 'day'? is #10 "Mr. Hynes'?
*April 15, 2014*

**Language Arts - Grammar - please check answers**

1. Michelle Kwan has become an inspiration to us all. 2. Is Sara the runner in the blue T-shirt? 3. I could have been a contender. 4. The winner of the spelling bee was Tracy. 5. The next speaker will be Mr. Gonzales. 6. Who was the fourteenth president of the United States? 7...
*April 15, 2014*

**Language Arts - Grammar - please check answers**

thank you!
*April 15, 2014*

**Language Arts - Grammar - please check answers**

okay thank you! Are these the correct Predicate nominatives? 2. president 3. "Night and Day" 4. champion 5. one 6. part
*April 15, 2014*

**Language Arts - Grammar - please check answers**

Identify the linking verb and the predicate nominative. 1. My partner for biology lab is Penelope. 2. Jason will be the next student council president. 3. Mrs. Furillo's favorite song is still "Night and Day." 4. Rocky Marciano was the world heavyweight boxing ...
*April 15, 2014*

**Science**

What is the origin of volcanism?
*March 3, 2014*

**Algebra help ASAP please**

thank you!
*February 27, 2014*

**Algebra help ASAP please**

For #1, i cannot figure out what 2x^2 - x - 1 factored is
*February 27, 2014*

**Algebra help ASAP please**

Simplify. 1. x^2 - 1/2x^2 - x - 1 2. x^2 - 16/x^2 - 6x + 8 3. 6x^2 + 4x/2x^2 + 4x My answers: 1. ??? 2. x+4/x-2 3. 3x?
*February 27, 2014*

**Algebra help ASAP please**

simplify each expression. 1. 6/2b - 1 minus 4/b - 1 2. n-6/2n + 2 plus 4n/3 3. 4/6x^3 - 12x^2 minus x - 3/6x^3 - 12x^2 please explain how to do these!! thanks
*February 27, 2014*

**Algebra 1**

Simplify each expression. 1. 2x + 10/x+5 2.x^2 - 25/3x - 15 3. x^2 + 4x/x^2 - 9x 4. n^2 + 7n + 10/ n^2 + 2n - 15 Please explain how to do these I don't understand!
*February 6, 2014*

**Science help please!**

1. The relationship between temperature and volume is known as what law? 2. What is the relationship between temperature and pressure? (directly proportional or inversely proportional) 3. The relationship between volume and pressure is known as what law? My answers: 1. Charles...
*December 2, 2013*

**Math help please**

1. The ordered pairs (0, 1), (1, 4), (2, 16), (3, 64), and (4, 256) represent a function. What is a rule that represents this function? y = 4^x y = 4x y = x^4 y = x + 4 2. Consider the relationship between the height of a tree and time. Time would be considered which of the ...
*November 22, 2013*

**Language Arts help last questions please**

Hm, I guess I will go over these phrases more. Thanks for your time
*November 18, 2013*

**Language Arts help last questions please**

Identify the italicized word(s) in each sentence. 17. Going outside during a thunderstorm is not the wisest thing to do in the summer. (*Going outside during a thunderstorm* is italicized) gerund phrase participal phrase infinitive phrase prepositional phrase 18. Following the...
*November 18, 2013*

**Language Arts help please**

thanks!
*November 18, 2013*

**Language Arts help please**

Choose the word(s) that the italicized phrase modifies or describes. 1. According to this map, the smallest region in the United States is New England. (*is New England* is italicized) map smallest region Unted States 2. DynaTAC800X, the nation's first cell phone, was ten ...
*November 18, 2013*

**Math help please**

are the answers: 1. A(n) = 12 + (n - 1)(6) 2. 2
*November 14, 2013*

**Math help please**

1. Each time a touchdown is scored in a football game, 6 points are added to the score of the scoring team. A team already has 12 points. What rule represents the number of points as an arithmetic sequence when n is the number of touchdowns scored? A(n) = 12 + 6n A(n)12 - (n...
*November 14, 2013*

**Math help please **

1. At midnight, the temperature, t, is 13 degrees below zero. If the temperature is expected to rise 5 degrees for the next several hours, what equation could you use to determine what temperature it will be after h hours? T = -13h + 5 H = 5t + 13 T = 5h -13 T = 5h + 13 My ...
*November 8, 2013*

**algebra**

The answer is the first choice because: 0 * 6 = 0 1 * 6 = 6 2 * 6 = 12
*November 8, 2013*

**Math help please**

1. The ordered pairs (1, 1), (2, 8), (3, 27), (4, 64), and (5,125) represent a function. What is a rule that represents this function? Y = x Y = 4x Y = x^2 Y = x^3 I don't know how to solve this please help!
*November 7, 2013*

**Health**

9. Kristy, a 13-year-old girl, has a resting heart rate of 67 beats per minute. Using the lower and upper limit reserve training percentages of 50 percent and 85 percent respectively, what is Kristy’s target heart rate range? 137 to 186 per minute 140 to 194 per minute ...
*October 23, 2013*

**Math**

Ok got it thanks!
*October 16, 2013*

**Math**

1. The US Senate is composed of 2 senators from each of the 50 states. For a treaty to be ratified, at least two-thirds of the senators present must approve the treaty. Suppose all senators are present and 48 of them have voted in favor of a treaty. What are the possible ...
*October 16, 2013*

**Math help**

1. Which value is a solution of the equation 5 - 4x = -3 0 2 -3 1/4 2. Which ordered pair is a solution of the equation y = x - 4 (2, 6) (6, 2) (-2, 6) (3, -1) 3. Which ordered pair is a solution of the equation y = 3x (-2, -9) (-8, -18) (-8, -3) (-10, -30) 4. Which ordered ...
*October 15, 2013*

**Social studies help please**

Thanks!
*October 9, 2013*

**Social studies help please**

1. Great early American civilizations built large cities In Central and South America In Alaska On the plains of North America In Asia 2. Spanish explorers first arrived in the Americas In the nineteenth century In the late 1400s In the late 1500s In the seventeenth century 3...
*October 9, 2013*

**Math help please**

1. Solve for x. 4(x - b) = x b = 4/3x b = 3/4x x = 4/3b x = 3/4b 2. Solve for y, then find the value of y when given x = 2. 6x = 7 - 4y -12 7/4 19/4 24 I need help solving these. Can you please explain how to solve these problems?
*October 2, 2013*

**Math help!**

I know this is kinda late but thank you!!! That is correct I got my paper back today thanks!
*October 1, 2013*

**Math help!**

1.(g + 4) - 3g = 1 + g 1 4 No solution Identity 2. 5y + 2 = 1/2(10y + 4) 5 10 No solution Identity 3. 0.5b + 4 = 2(b + 2) 0 0.5 No solution Identity 4. -3x + 5 = -3x + 10 5/6 -5/6 No solution Identity My answers: 1. 1 2. Identity 3. 0 ??? Not sure 4. No solution I really need ...
*October 1, 2013*

**Language arts help please**

Thanks!
*September 30, 2013*

**Language arts help please**

Hm ok. So maybe the answer is multilegged and kitchen? Is that correct?
*September 30, 2013*

**Language arts help please**

1. Identify the adjectives in the followig sentence. You can choose more than one answer. After a rainfall, bugs, slugs, and all sorts of multilegged critters would descend from the ceilings and fall on the kitchen table, or worse, on our bunks. Rainfall Sorts Multilegged ...
*September 30, 2013*

**Math last question i promise**

Thank you so much!
*September 27, 2013*

**Math last question i promise**

*didn't
*September 27, 2013*

**Math last question i promise**

Well, at first I din't know how to simplify it, but I think I figured it out. Does m = 60?
*September 27, 2013*

**Math last question i promise **

I have another problem: Solve this equation: $19.95 + $.99m + $65.32 = $144.67 I swear this is the last question! I'm sorry I am asking so much, I just need a little help.
*September 27, 2013*

**Math help please last question**

Thanks!
*September 27, 2013*

**Math help please last question**

I have another problem: Solve this equation: $19.95 + $.99m + $65.32 = $144.67 I swear this is the last question! I'm sorry I am asking so much, I just need a little help.
*September 27, 2013*

**Math help please last question**

Sorry I forgot to enter my name x is equal to 26. x = 26
*September 27, 2013*

**Math help please last question**

Solve the equation. 10. 2(4x -4) + 2(3x + 2) = 360 Can you please help me on this problem? Could you explain it please? I'm confused...
*September 27, 2013*

**Math help please**

Thank you! That helped a lot! I have no idea why 3 was hard for me...
*September 27, 2013*

**Math help please**

1. 2(3x + 5) = 46 4 5 6 7 2. 1/2x + 1/4x = 16 16 21.3 32 64 3. 6 - x - x = 18 -6 6 9 -9 4. 4x - 3/5 = 2/5 1/5 5/5 1/2 1/4 My answers: 1. 6 2. 21.3 3. ???? 4. 1/4 I have no idea how to solve 3! Can you please explain? Thank you
*September 27, 2013*

**ms.sue please help**

Well post what you need help with.
*September 25, 2013*

**Math help last question**

7. Solve. 2/3x - 5 = 1 x = 3 x = 4 x = 9 x = 12 My answer 7. x = 9
*September 25, 2013*

**Math help**

How is writing an equation to represent a situation involving two variables similar to writing an equation to represent a situation involving only one variable? How is it different?
*September 24, 2013*

**Last questions Ms. Sue please for math**

For #1, I meant to write in the choices Whole Numbers not While numbers. Sorry
*September 19, 2013*

**Last questions Ms. Sue please for math**

1. To which subset(s) does the number √42 belong? Rational numbers Irrational numbers Whole numbers, integers, rational numbers While numbers, natural numbers, integers 2. Evaluate the following expression for the values given. P/s + r^2q ( p = 60, q = 6, r = 5, s = 4) ...
*September 19, 2013*

**Math help Ms. Sue please**

Ok thank you for your time
*September 19, 2013*

**Math help Ms. Sue please**

Ok thanks Graham and Mrs.Sue! So is #4 2/9x-1/3 ?
*September 19, 2013*

**Math help Ms. Sue please**

1. What is the simplified form of the expression? 7m^2 + 6.5n - 4n + 2.5m^2 - n 9.5m^2 + 1.5n 4.5m^2 + 1.5n 1.5m^2 - 4.2n 9.5m^2 - 1.5n 2. What is the sum? 9/4 + (-1/5) 41/20 -41/20 -1/3 8/20 3. Order the following numbers from least to greatest. √7, -2.3, √3, 5.1...
*September 19, 2013*

**Language Arts 6 Ms. Sue please**

Ok I think number 1 is drama. Is that right?
*September 18, 2013*

**Language Arts 6 Ms. Sue please**

Actually I believe number 1 might be drama, because its describing what the production is. Is that right?
*September 18, 2013*

**Language Arts 6 Ms. Sue please**

Thanks for the links! So would number 2 be day? Number 1 would be production? Sorry I'm really trying to get these right I'm not good at them
*September 18, 2013*

**Language Arts 6 Ms. Sue please**

Sorry I meant number 1 would be promptly?
*September 18, 2013*

**Language Arts 6 Ms. Sue please**

So number 2 would be telling? And number 1 would be skipped?
*September 18, 2013*

**Language Arts 6 Ms. Sue please**

1. Which word is modified by the adjective in the sentence below? The drama production will start promptly at 8 o'clock. Start Promptly Production Drama 2. Which word is modified by the adjective in the sentence below? Not a single day goes by without me tellin my sister ...
*September 18, 2013*

**Math Ms. Sue please**

Thanks!
*September 13, 2013*

**Math Ms. Sue please**

1. What is the product of (-6.8)^2? -13.6 46.24 -46.24 13.6 2. Find the product. 5/10 * 10/3 23/6 -5/7 -7/5 5/3 3. Find the quotient. 3/7 ÷ 1/2 3/14 6/7 13/14 4/7 4. Simplify the expression. 3/4 ÷ 2/5 3/10 23/22 15/8 5/9 My answers: 1. 46.24 2. 5/3 3. 6/7 4. 15/8
*September 13, 2013*

**pre calc**

please help!!!!
*September 13, 2013*

**pre calc**

Let t be time in seconds and let r(t) be the rate, in gallons per second, that water enters a reservoir: r(t)=700−40t. a) For 0≤t≤30, when does the reservoir have the most water? b) For 0≤t≤30, when does the reservoir have the least water?
*September 13, 2013*

**Math Ms.Sue please**

1. 2/3 - 5/4 -3 -3/12 23/12 -17/12 2. -6.1 + 1.7 7.8 -4.4 -7.8 4.4 3. -1.8 - 3.9 -2.1 5.7 2.1 -5.7 4. A mountain climber ascends a mountain to its peak. The peak is 12,740 feet above sea level. The climber then descends 200 feet to meet a fellow climber. Find te climber's ...
*September 12, 2013*

**Math help Ms. Sue please**

Thanks!
*September 10, 2013*

**Math help Ms. Sue please**

1. Name the subset(s) of real numbers to which the number zero belongs. You can choose more than one answer. Irrational numbers Integers Whole numbers Natural numbers 2. Write an algebraic expression for the word phrase: the quotient of r and 12. r * 12 r + 12 r / 12 r - 12 3...
*September 10, 2013*

**precalc**

A $5000 investment earns 7.2% annual interest, and an $8000 investment earns 5.4%, both compounded annually. How long will it take for the smaller investment to catch up to the larger one?
*August 23, 2013*

**Statistics**

Hi Fábio How do you calculate the P8?
*August 10, 2013*

**Statistics**

sorry Walter i don't understand what is: 6f02271d.linkbucks ?
*August 10, 2013*

**Statistics**

i have this answer right just by lucky i don't now how solve this... i really want to understand how calculate P8
*August 10, 2013*

**Statistics**

P3 steps: 1º- read the problem 2º- what are the 162 and 97? you need to do something to these numbers so you can make the calculations 3º- calculate the difference 4º- calculate the SE to the difference 5º- apply the formula of z-test to the difference...
*August 10, 2013*

**Statistics**

Can anyone show the calculation for P8?
*August 10, 2013*

**Statistics**

P3 If you have the answer for P2 right it is easy to calculate the Z-test look too week 3 you have a lot of examples.
*August 10, 2013*

**Statistics**

Hey be careful some are given the wrong answer... Please try understand the exercises...
*August 10, 2013*

**Statistics**

What are the wrong answer?
*August 4, 2013*

**Stats**

P10 lesson 3.3 - is identical to the second exercise
*August 3, 2013*

**Stats**

Anyone can response to the problem 1?
*August 3, 2013*

**Stats**

P4 Lesson 3.2 - Attention to the explanation how we calculate the SD (beginning of the lesson); Attention to what is said in parenthesis in the enunciated. -2.6 is not correct P5 Use the t-curve to obtain the p-value. For this question you need to have answered correctly ...
*August 3, 2013*

**Stats**

P7 Calculate Pooled Estimated of p (p^)-lesson 3.4 P8 Calculate the two SE (SE(A) SE(B)) and then the SE final - see lesson 3.4 Try to do the calculates... If you can not do i explain.
*August 3, 2013*

**Stats**

Problem 9 solved... I could calculate everything but do not understand problem 1...
*August 3, 2013*

**Stats**

Helen how you calculate the P-value (problem 9)?
*August 3, 2013*

**Stats**

Problem 1 - anyone know the answer? Please explain.
*August 3, 2013*

**Stats**

For the question 6 (the P-value)the option 1 is wrong (i tried)
*August 3, 2013*

**Stats**

What is the correct answer?
*August 3, 2013*

**Physics with Calc**

A highway curve forms a section of a circle. A car goes around the curve as shown in the helicopter view of Figure P1.48. Its dashboard compass shows that the car is initially heading due east. After it travels 840 m, it is heading 35.0° south of east. Find the radius of ...
*July 17, 2013*

**Chemistry**

Hi, I am stuck on this question and would appreciate some guidance. The question states " The value of Kw decreases as the temperature decreases. Is the auto-ionization of water an exothermic or endothermic reaction in the forward direction?" I feel like the answer ...
*May 31, 2013*