Sunday

February 26, 2017
Total # Posts: 1,100

**Organic Chemistry**

A 1.0 gram sample of aspirin will dissolve in 300 mL of water and in 17 mL of chloroform at 25 deg C. a. What is the solubility of aspirin in each solvent expressed in g/mL? (show your calculations) I don't know where to start, does the molecular weight come into play (180...

*February 17, 2015*

**math**

George wants to put carpeting in a rectangular living room and a square bedroom. The length and width of the lving room is 12 feet by 18 feet. One side of the square bedroom is 13 feet. It will cost $3.50 per square foot to carpet the rooms. A)Write an expression that can be ...

*February 12, 2015*

**math**

Show how to write and evaluate an expression to represent and solve this problem: Jeff and his friend each text four classmates about a concert. Each classmate then texts four students from another school about the concert. If no one receives the message more than once, how ...

*February 11, 2015*

**math**

FOUR QUESTION PROBLEM: Amy and three friends launch a new website. Each of the four friends e-mails the web address to three new friends. These new friends forward the web address to three more friends. If no one receives the e-mails more than once, how many people will ...

*February 11, 2015*

**math**

Tell whether the value of the expression is less than the base of the expression: a) 2^3 b)(5/6)^3 c) 3^1 d)(5/2)^3 e) 1^3 ...b)equals 125/216. So is the correct answer YES it is less than the base? ...d)equals 125/8. Is the correct answer NO it is not less than the base?

*February 10, 2015*

**math**

Show how to write and evaluate an expression to represent and solve this problem: Jeff and his friend each text four classmates about a concert. Each classmate then texts four students from another school about the concert. If no one receives the message more than once, how ...

*February 10, 2015*

**math**

Tell whether the value of the expression is less than the base of the expression: a) 2^3 b)(5/6)^3 c) 3^1 d)(5/2)^3 e) 1^3 THANK YOU!

*February 10, 2015*

**math**

FOUR STEPS: Amy and three friends launch a new website. Each of the four friends e-mails the web address to three new friends. These new friends forward the web address to three more friends. If no one receives the e-mails more than once, how many people will receive the web ...

*February 10, 2015*

**math**

Show how to write and evaluate an expression to represent and solve this problem: Jeff and his friend each text four classmates about a concert. Each classmate then texts four students from another school about the concert. If no one receives the message more than once, how ...

*February 8, 2015*

**math**

In a game, you draw a card with three consecutive numbers on it. You can choose one of the numbers and find the sum of its prime factors. Then you can move that many spaces on a game board. You draw a card with the numbers 25, 26, 27. Which number should you choose if you want...

*February 7, 2015*

**math**

Alice wants to find all the price factors of the number you get when you multiply 17x11x13x7. She thinks she has to use a calculator to perform all the multiplications and then find the prime factorization of the resulting number. Do you agree? Why or why not? THX

*February 7, 2015*

**math**

Explain why it is possible to draw more than two different rectangles with an area of 36 square units, but it is not possible to draw more than two different rectangles with an area of 15 square units. The sides of the rectangles are whole numbers. EXPLAIN your answer. THX

*February 7, 2015*

**Chemistry**

I understand the solution above but if the limiting reagent is 1.8 that means to get the [Ce^3+]= 1.5-1.8= 0.3mols/ 0.10L wherein 0.1L is the total volume. Is this correct? Thanks.

*February 4, 2015*

**Chemistry**

The ksp for Ce(IO3)3 is 3.2E-10. What is Ce^3+ concentration in a solution prepared by mixing 60ml of 0.025M Ce^3+ with 40ml of 0.045M IO3^-?

*February 4, 2015*

**statistics**

suppose a sample of 2404 tenth graders is drawn.Of the sampled, 601 read at or below the eighth grade level. using the data, construct the 98% confidence interval for the population proportion of tenth graders reading at or below the eighth grade level.

*January 23, 2015*

**math**

suppose a sample of 2404 tenth graders is drawn.Of the sampled, 601 read at or below the eighth grade level. using the data, construct the 98% confidence interval for the population proportion of tenth graders reading at or below the eighth grade level.

*January 23, 2015*

**math**

Suppose babies born in a large hospital have a mean weight of 3181 grams, and a standard deviation of 526. If 97 babies are sampled at random from the hospital, what is the probability that the mean weight of the sample babies would differ from the population mean by greater ...

*January 23, 2015*

**algebra**

Find the equation of the line passing through the points 2003-13-02-00-00_vl_files/i0030000.jpg and 2003-13-02-00-00_vl_files/i0030001.jpg. A. 2003-13-02-00-00_vl_files/i0030002.jpg B. 2003-13-02-00-00_vl_files/i0030003.jpg C. 2003-13-02-00-00_vl_files/i0030004.jpg D. 2003-13-...

*January 15, 2015*

**Algebra**

4x-1+3=4x My answer is -5 4x-1+3x=4x 3x+4x 8x-1 = 4x-8 -1 = -4x -1-4 = x -5 = x Am I correct

*January 13, 2015*

**Algebra- Middle**

My math question ask is 1/3(x-9) = 2x+7 greater than or less than 4/3(x+4)= -4x. The problem (1) answer = 6. Problem (2) answer = -1. Therefore problem (2) is less than problem (1). Are the answer to the equations correct. Sincerely

*January 13, 2015*

**Math**

Thank You Reiny, much appreciated. Could you tell Ms. Sue thanks for the heads up on the website math is fun, I have been learnign quite alot form it. Thank You again. Kyle

*January 12, 2015*

**Math**

If I were to compare -(-9)and -[-9] would it be less than, more than or equal to? I say it is equal to. Would I be right? Thank You for your help.

*January 12, 2015*

**Math**

Thank you very much Ms. Sue

*January 12, 2015*

**Math**

What rational number is less than 0 but greater than -1/2? I think its negative 1/4 would I be right? Thank You for your help.

*January 12, 2015*

**Physics**

Because he found the velocity per second so you have to multiply by two to get the answer for two seconds

*January 7, 2015*

**college pre-calculus**

what is the equation of lowest degree with real coefficients if two of its roots are -1 and 1+i? A. x^3+x^2+2=0 B. x^-x^2-2=0 C. x^3-x+2=0 D. x^3-x^2+2=0 e. none of the above i don't get it is it (x+1) (1+i)

*January 6, 2015*

**ap chemistry**

thanks

*January 6, 2015*

**ap chemistry**

no she didn't give it sadly

*January 6, 2015*

**ap chemistry**

calculate the concentration of CO2 in a soft drink after the bottle is opened and equilibrates at 25C under a CO2 partial pressure of 0.0003 atm. c=KP henry's law k=? P=0.0003 atm. how to solve

*January 6, 2015*

**ap chemistry**

calculate the concentration of CO2 in a soft drink after the bottle is opened and equilibrates at 25C under a CO2 partial pressure of 0.0003 atm. c=KP henry's law k=? P=0.0003 atm. how to solve

*January 6, 2015*

**chemistry**

i need help

*January 6, 2015*

**chemistry**

calculate the concentration of CO2 in a soft drink after the bottle is opened and equilibrates at 25C under a CO2 partial pressure of 0.0003 atm. c=KP henry's law k=? P=0.0003 atm. how to solve

*January 6, 2015*

**college**

a solution is prepared by mixing 50.0 mL toluene (C6H5CH3 d=0.867 g/mL) with 125 mL Benzene (C6H6 d=0.874 g/mL). assuming that the volumes add upon mixing, calculate the mass percent, mole fraction, molality, and molarity of the toluene.

*January 5, 2015*

**chemistry**

a solution is made by dissolving 25 g NaCl in enough water to make 1.0 L solution. Assume that density of the solution is 1.0 g/mL. calculate the mass percent, molarity, molality, and mole fraction of NaCl. whats wrong 25 g NaCl 1.0 L solution 1.0 g/mL 25 g NaCl/58.44 g NaCl...

*January 5, 2015*

**college chemistry**

a solution is made by dissolving 25 g NaCl in enough water to make 1.0 L solution. Assume that density of the solution is 1.0 g/mL. calculate the mass percent, molarity, molality, and mole fraction of NaCl.

*January 5, 2015*

**science**

a solution is made by dissolving 25 g NaCl in enough water to make 1.0 L solution. Assume that density of the solution is 1.0 g/mL. calculate the mass percent, molarity, molality, and mole fraction of NaCl.

*January 5, 2015*

**ap chemistry**

tanks

*January 5, 2015*

**ap chemistry**

what else is right?

*January 5, 2015*

**ap chemistry**

its touluene

*January 5, 2015*

**ap chemistry**

what else is right help me

*January 5, 2015*

**ap chemistry**

is that right answer

*January 5, 2015*

**ap chemistry**

HELP ME WITH THIS ONE WHEN DONE WITH THE OTHER THX calculate the concentration of CO2 in a soft drink after the bottle is opened and equilibrates at 25C under a CO2 partial pressure of 0.0003 atm. c=KP henry's law k=? P=0.0003 atm. how to solve

*January 5, 2015*

**ap chemistry**

i figureed is this right DrBOb22 is my ansswers right mass percent: 43.359/152.6gx100= 28.4% mass of benzene: 25 mLx .874 g/mL= 109.25 grams mass of touluene: 50 mLx .867 g/mL= 43.35 grams molarity: .251 mol/.175 L= 1.43 M molality: .251 mol/ .10925 kg= 2.30 m x touluene= .470...

*January 5, 2015*

**ap chemistry**

need help

*January 5, 2015*

**ap chemistry**

is this right: mass percent: toluene 28.4 % benezene: 7.6% mole fraction x C6H5CH3: .251 mole fraction of X C6H6 1.619 molality: 2.3 molal molarity: 1.43 M is that right? idk

*January 5, 2015*

**ap chemistry**

mass of benzene is 0.874 g/ml mass of toluene= 0.867 g/mL

*January 5, 2015*

**ap chemistry**

i don't know how to do it

*January 5, 2015*

**ap chemistry**

but how u do it explain please

*January 5, 2015*

**ap chemistry**

a solution is prepared by mixing 50.0 mL toluene (C6H5CH3 d=0.867 g/mL) with 125 mL Benzene (C6H6 d=0.874 g/mL). assuming that the volumes add upon mixing, calculate the mass percent, mole fraction, molality, and molarity of the toluene.

*January 5, 2015*

**chemistry**

calculate the concentration of CO2, in a soft drink after the bottle is opened and equilibriates at 25C under a CO2 partial pressure of 0.0003 atm.

*January 5, 2015*

**chemistry**

a solution is prepared by mixing 50.0 mL toluene (C6H5CH3 d=0.867 g/mL) with 125 mL Benzene (C6H6 d=0.874 g/mL). assuming that the volumes add upon mixing, calculate the mass percent, mole fraction, molality, and molarity of the toluene.

*January 5, 2015*

**science**

a solution is made by dissolving 25 g NaCl in enough water to make 1.0 L solution. Assume that density of the solution is 1.0 g/mL. calculate the mass percent, molarity, molality, and mole fraction of NaCl.

*January 5, 2015*

**ELA**

I'm reading the Iliad and a question has come up - What is the conflicting message about the relationship between humans and the gods does this myth give? Any help with this would be much appreciatd. Thank You

*January 5, 2015*

**AP Chemistry**

Consider the following reaction: CH3X + Y --> CH3Y + X At 25 degrees Celcius the following two experiments were run, yielding the following data: Experiment 1: [Y]0 = 3.0 M [CH3X] (mol/L) Time (hours) 7.08*10^-3 1.0 4.52*10^-3 1.5 2.23*10^-3 2.3 4.76*10^-4 4.0 8.44*10^-5 5....

*January 1, 2015*

**College Algebra**

According to Newton's law of cooling, the rate at which an object cools is directly proportional to the difference in temperature between the object and the surrounding medium. The face of a household iron cools from 130° to 100° in 30 minutes in a room that ...

*December 10, 2014*

**College Algebra**

The number of bacteria in a certain culture increased from 500 to 1000 between 7:00 A.M. and 9:00 A.M. Assuming growth is exponential, the number f(t) of bacteria t hours after 7:00 A.M. is given by f(t) = 500(2)^t/2. (a) Estimate the number of bacteria in the culture at 8:00 ...

*December 10, 2014*

**Math**

A length of rope is stretched between the top edge of a building and a stake in the ground. The head of the stake is at ground level. The rope also touches a tree that is growing halfway between the stake and the building. If the tree is 38 feet tall, how tall is the building...

*December 4, 2014*

**ELA**

Have been all over Google looking for laymans terms for this - coulden't find anything but thanks anyway

*December 2, 2014*

**ELA**

Athena asks Zeus "will you save a man whom the fates appoint to die?" How does this question relate to the overall theme in the iliad? SOOOOO CONFUSED Please help - Thank You

*December 2, 2014*

**Math**

A town has 4900 registered voters, each of whom is either a Republican, a Democrat or an Independent. In the last primary election, 1150 people voted, and the number of Republicans who voted was 720 fewer than 30% of the total number of Democrats plus Independents combined. ...

*November 30, 2014*

**physics**

The acceleration of gravity is 9.8 m/s2 . What is the magnitude of the total force on a(n) 75 kg driver by the dragster he operates as it accelerates horizontally along a straight line from rest to 66 m/s in 4.5 s? Answer in units of kN

*November 22, 2014*

**Math**

Thank You Very Much Derius.

*November 19, 2014*

**Math**

Everyday I practice the drums for the same length of time. By the end of the 15th week, I have practiced a total of 37 1/2 weekday hours. How many hours do I practice a day? I did 15 x 5 to get 75 days then divided by 37 1/2 hours to get how many hours per day am I doing this ...

*November 19, 2014*

**Math!**

Let h(x)=4-x. Use h, the table, and points on graph to evaluate the expression. x 2 3 4 5 6 f(x) −1 0 1 2 3 g(x) points (-1,1), (2,3), (3,5) (a) (g^−1 compose f^ −1)(2) (b) (g^−1 compose h)(1) (c) (h^−1 compose f compose g^-1)(3)

*November 19, 2014*

**College Algebra**

Ozone occurs at all levels of Earth's atmosphere. The density of ozone varies both seasonally and latitudinally. At a given city, the density D(h) of ozone (in 10^−3cm/km) for altitudes h between 20 kilometers and 35 kilometers was determined experimentally. For the ...

*November 12, 2014*

**College Algebra**

Find the standard equation of a parabola that has a vertical axis and satisfies the given conditions. x-intercepts −2 and 8,highest point has y-coordinate 5

*November 12, 2014*

**College Algebra**

An object is projected vertically upward from the top of a building with an initial velocity of 112 ft/sec. Its distance s(t) in feet above the ground after t seconds is given by the equation s(t) = −16t^2 + 112t + 100. (a) Find its maximum distance above the ground. s(t...

*November 12, 2014*

**Math**

How would you order the following from least to greatest? 1/4, 0.2, 3/8, 30% Would it be 0.2, 1/4, 30% and 3/8? This was my answer but it was marked wrong? Where did I go wrong? Thanks for your help

*November 10, 2014*

**College Math**

An object is projected vertically upward with an initial velocity of v0 ft/sec, and its distance s(t) in feet above the ground after t seconds is given by the formula s(t) = −16t^2 + v0t. (a) If the object hits the ground after 8 seconds, find its initial velocity v0. v0...

*November 10, 2014*

**Physics**

A plane is flying horizontally with speed 251 m/s at a height 2180 m above the ground, a package is thrown downward from the plane with a vertical speed v1 = 80 m/s. What is the magnitude of the total velocity of the package at the moment it is thrown as seen by an observer on...

*November 7, 2014*

**Physics**

A block of mass m = 3.65 kg is attached to a spring (k = 27.5 N/m) by a rope that hangs over a pulley of mass M = 7.30 kg and radius R = 2.81 cm, as shown in the figure. a) Treating the pulley as a solid homogeneous disk, neglecting friction at the axle of the pulley, and ...

*October 31, 2014*

**Physics**

I would really appreciate the help for this assignment. A small reasoning for the answer would be very helpful. Thank you. A sphere of mass m and radius r is attached to the rim of a disk (mass M, radius R). The disk is rotating counter-clockwise with a constant period T ...

*October 31, 2014*

**Math**

Sue bought an ice cream cone from Dairy Queen. The cone had a radius of 3cm and a height of 8cm. If I use the formula of (TT=3.14, r=radius, h=height) 2 V=1/3TTr h Is the answer 50.24 cm3? Any help is appreciated. If I'm not right could you tell/show me how to figure this ...

*October 27, 2014*

**Math**

Still not getting it - but if I were to guess I would probably pick D? I will go back to math is fun site and study some more! Thanks again, Kyle

*October 25, 2014*

**Math**

Oh My God! The expression is 2(n-6) So sorry Ms. Sue

*October 25, 2014*

**Math**

Which verbal expression represents the algebraic expression? (A) 2 times a number minus 6 (B) twice the difference between 6 and a number (C) 6 less than twice a number (D) twice the difference between a number and 6 I think it's A, am I right? Thank You for your help.

*October 25, 2014*

**Math**

Thanks for the site will go on it. Thanks again. Kyle

*October 24, 2014*

**Math**

Thank You Ms. Sue, I'll get the hang of this eventually!!!!!

*October 24, 2014*

**Math**

Yes, it's me again! How would you write the expression that represents the perimeter of a rectangle measuring 4 x - 4 + 7 x + 1 Would it be -4 + 1 = - 5

*October 24, 2014*

**Math**

I meant to say would it be 26 x + 12

*October 24, 2014*

**math**

Thank You

*October 24, 2014*

**math**

How would you write the expression that represents the perimeter of a rectangle measuring 9 x + 9 and 4 x - 3 Would it be 26 x + 2 Any help would be appreciated. Thank You

*October 24, 2014*

**Math**

Ah Yes! Thank You

*October 21, 2014*

**Math**

Am I right? Nobby Hobby charges $35.00 entry fee plus $18.50 per night of camping. Write an algerbraic expression for the cost in dollarsof entry to Nobby Hobby ($35.00+$18.50).n Thanks

*October 21, 2014*

**Quick math help**

faction in simple form

*October 15, 2014*

**physics**

Nevermind

*October 14, 2014*

**physics**

016 10.0 points One of the great dangers to mountain climbers is an avalanche, in which a large mass of snow and ice breaks loose and goes on an essentially frictionless “ride” down a mountainside on a cushion of compressed air. The acceleration of gravity is 9.8 m/...

*October 14, 2014*

**Math**

It is better to use fractions when it is on top of other fractions, for example 2/3+2/4 ----------- 2/5-2/6 Because then you can get a common demoninator and cancel For decimals I don't know pretty much everything else

*October 14, 2014*

**physics**

016 10.0 points One of the great dangers to mountain climbers is an avalanche, in which a large mass of snow and ice breaks loose and goes on an essentially frictionless “ride” down a mountainside on a cushion of compressed air. The acceleration of gravity is 9.8 m/...

*October 14, 2014*

**Math**

Did you type that in right?

*October 14, 2014*

**math**

Did you try distributing

*October 14, 2014*

**math**

6 is the largest common factor

*October 8, 2014*

**math**

i am so confused, can you teach me?

*October 8, 2014*

**math**

the factorization of 18 is 2x3x3, and the 60 is 2x2x3x5. so the question is asking the greatest so 3 is not correct? maybe 2?

*October 8, 2014*

**math**

Q2 answer is 3?

*October 8, 2014*

**math**

There are 18 boys and 60 girls working on a community service project. They work in groups where each group has the same number of boys and the same number of girls. Q1: What is the first step to finding the greatest number of groups possible? A. Multiply 18 times 60 B. Divide...

*October 8, 2014*

**Physics**

A 5.00×10^5-kg rocket is accelerating straight up. Its engines produce 1.250×10^7 N of thrust, and air resistance is 4.50×10^6 N. What is the rocket’s acceleration? I just need the formula for finding the acceleration.

*October 1, 2014*