Friday

September 30, 2016
Total # Posts: 2,324

**Chemistry **

Can someone walk me through how to work this I have no clue where to start. I have converted grams to moles and Celsius to kelvin but I don't know where to go from there. Thank you! A piece of dry ice (solid CO2, d = 0.900 g/mL) weighing 21.0 g is placed in a 0.870 L ...

*October 4, 2013*

**Brief Calc**

Very nice, thanks Reiny

*September 25, 2013*

**Brief Calc**

i submitted the answer steve had first and it came out correct for the previous question

*September 25, 2013*

**Brief Calc**

thank you that one was correct, i just had one other i couldn't get, the problem is find dy/dx using implicit differentiation: 4x+3y=xy i found the derivative to be... y-4/3-x same question as the last one, y=? dy/dx=? Thanks again for your help

*September 25, 2013*

**Brief Calc**

e^x y =3 find dy/dx using implicit differentiation the answer is -y Compare your answer with the result obtained by first solving for y as a function of x and then taking the derivative. y=? dy/dx=? help me out with these last two please I don't know what they are asking

*September 25, 2013*

**Chemistry**

A sample of impure magnesium was analyzed by allowing it to react with excess HCl solution: Mg(s) + 2 HCl(aq) → MgCl2(aq) + H2(g) After 1.27 g of the impure metal was treated with 0.100 L of 0.768 M HCl, 0.0125 mol HCl remained. Assuming the impurities do not react, what...

*September 22, 2013*

**Science/ Chemistry**

When 0.422 g of phosphorus is burned, 0.967 g of a white oxide (a compound of phosphorus and oxygen) is obtained. a. Determine the empirical formula of the oxide. So for the empirical Formula I got P_2O_5 now it wants me to Write a balanced equation for the reaction of ...

*September 22, 2013*

**Chemistry**

What is the maximum mass of S8 that can be produced by combining 85.0 g of each reactant? 8SO2 + 16H2S yields 3S8 +16H2O

*September 21, 2013*

**physics**

30m

*September 19, 2013*

**Calculus**

Find the Indefinite Integral without u substitution of the following a)(8x-3)/(12x^6) b) 2sqrtx(5x-6) c) (4x+3)/xsqrtx d) (5x-6)^2 / sqrt x e) 16x^2 + x - 20 / 4x^2

*September 18, 2013*

**further Mathematics**

Let A=(cosA -sinA) (sinA cosA) show that A^2=(cos2A sin2A) (sin2A cos2A)

*September 17, 2013*

**further mathematics**

Let P=(cosA sinA) (sinA cosA) Q=(cosB sinA) (sinB cosA) show that PQ=(cosA(A-B) sin(A B)) (sinA(A B) cos(A-B))

*September 17, 2013*

**Physics**

at the same time

*September 16, 2013*

**math**

In a regular hexagon, what is the ratio of the length of the shortest diagonal to the length of the longest diagonal? Express your answer as a common fraction in the simplest radical form.

*September 8, 2013*

**physics**

A boy sledding down a hill accelerates at 1.20 m/s2. If he started from rest, in what distance would he reach a speed of 7.00 m/s?

*September 4, 2013*

**physics**

A boy sledding down a hill accelerates at 1.20 m/s2. If he started from rest, in what distance would he reach a speed of 7.00 m/s?

*September 4, 2013*

**physics**

how far has it gone @bobpursley

*September 4, 2013*

**MATH**

THE QUOTIENT IS 45 1/4 WHAT IS THE DIVISOR

*September 3, 2013*

**Algebra**

(3Q+2T+F)/5=0.90 for F

*August 27, 2013*

**math**

Solve 3^x * 9^2x * 8^x/18^x *27^2x *3^2x

*August 24, 2013*

**us history**

The Constitution has endured for more than 200 years. Use what you have learned about the principles of the Constitution to explain why it has lasted as a framework for the nation's government

*August 23, 2013*

**us history**

What is taxation without representation? Why did the colonists consider this practice a problem?

*August 23, 2013*

**physics**

Time=distance/velocity =20/300 =0.067secs s = ut 1/2gt^2 s = 0*0.067 0.5*10*0:067^2 s = 0 5*0.004489 s = 0 0.0224 s = 0.022m

*August 21, 2013*

**physics**

Time=distance/velocity =20/300 =0.067secs s = ut 1/2gt^2 s = 0*0.067 0.5*10*0:067^2 s = 0 5*0.004489 s = 0 0.0224 s = 0.022m

*August 21, 2013*

**physics**

A bullet is fired in a horizontal direction with a muzzle velocity of 300m/s.in the absence of air resistance,how far will it have droppped in travelling a horizontal distance of 20m.

*August 20, 2013*

**writing**

Explain what is wrong with the following sentence and revise as needed to correct the problems: " While repelling from the cliff, my backpack slipped and fell to the canyon floor."

*August 7, 2013*

**Math Statistics**

5. Students in an introductory statistics class were asked to report the age of their mothers when they were born. Summary statistics include Sample size: 36 students Sample mean: 29.643 years Sample standard deviation: 4.564 years a. Calculate the standard error of this ...

*July 29, 2013*

**geometry**

consider a circle of radius 1, and corresponding inscribed and circumscribed polygons with the number of sides n = 3, 4, 5, 6, and 8. A: For each n = 3, 4, 5, 6 & 8, what are the areas of the inscribed and circumscribed polygons with n sides?

*July 27, 2013*

**Math Statistics**

2. A statistics professor has asked his students to flip coins over the years. He has kept track of how many flips land heads and how many land tails. Combining the results of his students over many years, he has formed a 95% confidence interval for the long-run population ...

*July 27, 2013*

**Math Statistics**

Students enrolled in an introductory statistics course at a university were asked to take a survey that indicated whether the student has a visual or verbal learning style. Of the 39 students who took the survey, 25 were judged to have a visual learning style and 14 were ...

*July 25, 2013*

**finance (math)**

nevermind... it's the same as 5%. I get it.

*July 22, 2013*

**finance (math)**

If you just use the Table of Future Value Factors, you'll see that 5% at 15 years is 2.079. Therefore, 75,000 * 2.079 = 155,925. I am really confused as to where the 1.05 comes from...

*July 22, 2013*

**finance (math)**

Where are you getting the 1.05 from?

*July 22, 2013*

**American National Government**

The purpose of gerrymandering a district is to- the influence of certain groups and gurantee that certain representatives keep their seats

*July 21, 2013*

**Math: Calc 2**

Find the volume of the solid obtained by rotating the region under the graph of the function f(x) = x^(13/12) about the x-axis over the interval [1,3]. Thanks!

*July 9, 2013*

**physics**

A 75.0-kg man is riding an escalator in a shopping mall. The escalator moves the man at a constant velocity from ground level to the floor above, a vertical height of 4.30 m. What is the work done on the man by (a) the gravitational force and (b) the escalator?

*July 8, 2013*

**Phisics**

A speed boat is required to move at a constant speed of 50 MPH. What is the power needed to overcome a resistive force of 1000 lbs from the water?

*July 3, 2013*

**English**

What is the different between traditional Vietnamese and Vietnamese tradition?

*June 25, 2013*

**Discreet math**

[(pvq)^(p=>)^(q=>)]=>r[(pvq)^(p=>)^(q=>)]=>r

*June 25, 2013*

**Math 61 part 2**

Find the centriod of the boundEd by the curvez y=x^2 and y=2x+3

*June 24, 2013*

**Math 61**

Find the arc length of the curve y^3=8x^2 fr0m x=1 to x=8.

*June 23, 2013*

**statistics**

The customer bills in a family restaurant are normally distributed. The bills mean is $28 and has a standard deviation of $6. a. Identify what the random variable you are measuring is in this problem. b. What is the probability that a randomly selected bill will be at least $...

*June 22, 2013*

**World Geography**

reconciling diverse cultural heritages

*June 19, 2013*

**Geometry**

53. What is the equation of the circle with center (2, –5) that passes through the point (–2, 10)? (1 point) (x – 2)2 + (y – (–5))2 = 25 (x – (–2))2 + (y – 10)2 = 241 (x – 2)2 + (y – (–5))2 = 241 (x – (–2))2 + (y...

*June 10, 2013*

**Geometry**

50. Find the value of x for ° and °. The figure is not drawn to scale. (1 point) 34° 56.5° 22° 68°

*June 10, 2013*

**Geometry**

46. Assume that lines that appear to be tangent are tangent. O is the center of the circle. Find the value of x. Figures are not drawn to scale. mO = 128° (1 point) 52 308 64 256

*June 10, 2013*

**trigonometry**

how do i determine the point of intersection of a circle with a radius of 14 and the line coming in at a 35 degree angle

*June 6, 2013*

**physics**

A juggler traveling in a train on level track throws a ball straight up, relative to the train, with a speed of 5.75 m/s. The train has a velocity of 19 m/s due east. (a) As observed by the juggler, what is the ball's total time of flight? s What is the displacement of the...

*May 30, 2013*

**Physics**

How much work does it take to stretch a spring with k= 150N/M 10cm from equilibrium?

*May 30, 2013*

**Physics**

If the coefficient of kinetic friction is 0.25, how much work do you do when you slide a 45 kg box at constant speed across a 5.8m -wide room?

*May 30, 2013*

**Physics**

Segment A 540-0/120-0 =4.5 Segment B 0-0/0-0 = 0 Segment C 1080-540/288 = 7.5

*May 29, 2013*

**Physics**

A snowmobile moves according to the velocity-time graph shown in the drawing. What is the snowmobile's average acceleration during each of the segments A, B, and C? The scale for the time axis is 60 s per increment, and the scale for the velocity axis is 270 m/s per ...

*May 29, 2013*

**CHEMISTRY**

Which of these statements is not true? lithium reacts with carbon to form ionic carbides, Acetylene is neccesary for the formation of some carbide liquid ammonia is is used to form carbides All metals react with carbon to form carbides

*May 29, 2013*

**Chem**

The molar weight of MgSO4 is 120.366gmol-1. What is the mass/volume percentage of a 2.5M water solution of MgSO4?

*May 27, 2013*

**Physics**

Starting from rest, a skier slides 100 m down a 28 degree slope.How much longer does the run take if the coefficient of kinetic friction is 0.17 instead of 0?

*May 27, 2013*

**Statistics**

During the 2011-12 winter season, a homeowner received four deliveries of heating oil, as shown in the following table: Gallons Purchased Price per Gallon ($) 209 2.60 182 2.40 157 2.78 149 2.74 The homeowner claimed that the mean price he paid for oil during the season was (2...

*May 26, 2013*

**Statistics**

. The following data give the 2010 gross domestic product (in billions of dollars) for al 50 states. The data entered in alphabetical order by state (Source: Bureau of Economic Analysis). 173 49 254 103 1901 258 237 62 748 403 67 55 652 276 143 127 163 219 52 295 379 384 270 ...

*May 26, 2013*

**Statistics**

1. The following data give the amount of money (in dollars) that each of six Canadian social service charities spent to raise $100 in donations during 2010. The values, listed in that order, are for the Calgary Inter-Faith Food Bank Society, Covenant House Toronto, The ...

*May 26, 2013*

**Ethics**

how do businesses try to find their way around these laws

*May 24, 2013*

**math**

If it is given tan(A-B) tanA-tanB/-1+tanAtanB and tanP-1/1+tanP=tan195 Find the value of P

*May 19, 2013*

**Math**

A wheel on Greg's bicycle is 0.3 m in diameter. Greg races the bicycle for 31 m. How many times does the wheel turn as the bicycle travels this distance?

*May 14, 2013*

**Public speaking**

When conducting research for supporting materials, it is imperative to remember: A. there is one right source for certain information. B. always to take notes and record. C. always do a personal interview. D. use only the most current source of information

*May 13, 2013*

**Environmental Science**

Consider the population situation in Italy or Germany; very low birth rates, an aging population, and eventual decline in overall numbers. For this week's individual work, please write a 1-2 page paper (counting body text only, not title or reference pages) in double-...

*May 9, 2013*

**calculus**

Given ensuing information, determine the least cost and the least cost mix of on- and off-shore pipe. The intake facility is in the water 2 miles vertically north of the shoreline The water filtration plant is on land 1 mile vertically south of the shoreline The intake and ...

*May 8, 2013*

**Math**

316/1 = x/3 cross multiply 316*3 = x 948 = x x = 948 similar cone volume

*May 8, 2013*

**Ms.Sue**

Ms.Sue, do you know how to do calc?

*May 8, 2013*

**calculus**

Given ensuing information, determine the least cost and the least cost mix of on- and off-shore pipe. -The intake facility is in the water 2 miles vertically north of the shoreline -The water filtration plant is on land 1 mile vertically south of the shoreline -The intake and ...

*May 8, 2013*

**Math**

32 is wrong 5/(3/5) = (5/1)*(3/5) flip and multiply (5/1)*(5/3) = 25/3

*May 8, 2013*

**Math**

dividing fractions is pretty simple. you take the denominator (the second fraction) and flip it. Then simply multiply the fractions ex. (1/2) divided by 5/7 First, flip, then multiply (1/2)*(7/5) so 7*1 = 7 and 5*2 = 10 therefor the answer is 7/10!

*May 8, 2013*

**Physics**

yea, no thank you!

*May 8, 2013*

**calculus**

thank you!!!

*May 8, 2013*

**calculus**

16. Given the following information, determine the constant speed, travel time, and cost that represent the minimum one-way trip delivery cost. Fuel costs per hour are equal to V^2/600 V is the speed in miles per hour Driver (labor) costs are $10 per hour One-way distance is ...

*May 8, 2013*

**calculus**

16. Given the following information, determine the constant speed, travel time, and cost that represent the minimum one-way trip delivery cost. Fuel costs per hour are equal to V^2/600 V is the speed in miles per hour Driver (labor) costs are $10 per hour One-way distance is ...

*May 8, 2013*

**calc**

can you tell me how you got √(x^2+4) and √((3-x)^2 + 1)

*May 8, 2013*

**statistics**

The manufacturer of a new compact car claims the miles per gallon (mpg) for the gasoline consumption is mound-shaped and symmetric with a mean of 24.6 mpg and a standard deviation of 11.2 mpg. If 30 such cars are tested, what is the probability the average mpg achieved by ...

*May 5, 2013*

**maths**

The monthly standing charge for a electrical company is €12.50 plus a cost of €0.16 per unit of electricity used. A customers monthly bill was €156.18. Determine how many units of electricity the customer used in that month.

*May 3, 2013*

**physics**

It is 5.4 m/s

*May 2, 2013*

**Science**

1.Why do you think an FRH doesn’t come with water already in it? 2.Do you think there are small pieces or large pieces of magnesium metal in an FRH? Explain. 3. Why is it important that the reaction in an FRH be fast?

*May 1, 2013*

**Chemistry**

What should be the number of significant figures in the following calculation? It's an error calculation which is absolute value (True value - experimental value) / true value * 100 so it would be: absolute value [-601.7 - (-587)] / -601.7 * 100 Should the answer be 2.44 ...

*April 30, 2013*

**MATHS**

In a bookcase, there are 7 fiction books for every 4 nonfiction books. There are 33 books in the bookcase. How many nonfiction books are in the bookcase?

*April 30, 2013*

**English**

ok thank you - so it is C...

*April 29, 2013*

**English**

Forget it - it's C...right?

*April 29, 2013*

**English**

8. Identify the sentence that contains an error in punctuation or capitalization. "After you’ve rested," Frank said, "please help me move these boxes." "Can we wait until later?" asked Emily. "I have a lot of homework." "It won...

*April 29, 2013*

**English**

thank you

*April 29, 2013*

**English**

Mel Gibson , Hamlet and Macbeth in A...bonjour in B.,...Smithsonian and Time in C...and Our Town in D..

*April 29, 2013*

**English**

After reading your link. i think it is B. with bonjour being italicized.

*April 29, 2013*

**English**

What do you think it is? why would MEL GIBSON be italicized? In that sentence Mel gibso is italicized and hamlet or macbeth is italicized.

*April 29, 2013*

**English**

7. Identify the sentence that contains a word or phrase that should not be in italics. *Is Mel Gibson in the movie version of Hamlet or Macbeth? Lenny has trouble pronouncing the word bonjour. Glenda subscribes to Smithsonian and Time magazines. Thornton Wilder's play Our...

*April 29, 2013*

**english**

after Bites

*April 29, 2013*

**english**

I understand what you are saying now - I think it is B..

*April 29, 2013*

**english**

I have to pick the one that is pucuated or capitalized incorrectly. and i CANNOT pick two answers.

*April 29, 2013*

**english**

I understand that. I think it is A.

*April 29, 2013*

**english**

so which one would you go with?

*April 29, 2013*

**english**

9. Identify the sentence that contains an error in punctuation or capitalization. Perry asked if anyone knew the words to "Locked Out." "Wasn't that in the movie Reality Bites," asked Grace? Garrison yelled from the other room, "I loved that movie...

*April 29, 2013*

**english**

I think you've is incorrect.

*April 29, 2013*

**english**

now that I have reread them, I think its A.

*April 29, 2013*

**english**

why is that wrong? shouldn't it be in quotations.

*April 29, 2013*

**english**

8. Identify the sentence that contains an error in punctuation or capitalization. "After you’ve rested," Frank said, "please help me move these boxes." "Can we wait until later?" asked Emily. "I have a lot of homework." "It ...

*April 29, 2013*

**english**

Thank you

*April 29, 2013*