Thursday
March 23, 2017

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Posts by brianna

Total # Posts: 724

chem
A gas at 61°C occupies a volume of 0.67 L. At what Celsius temperature will the volume increase to 1.12 L?
March 21, 2017

chem
The pressure in an automobile tire is 1.89 atm at 24.0°C. What will be the pressure if the temperature increases to 38.0°C? i alreaddy got 1.89/24.0. i dont know where to go from there
March 21, 2017

Math
A school is holding a Fixed Raffle, where only a certain number of raffle tickets can be sold.  The school sold 970 of these tickets for $10 each.  One of the tickets will win $2910, two tickets will win $970, and 5 tickets will win $485.   What is the expected ...
February 23, 2017

MAth
Darth Vader is designing a game that costs $20.  The game consists of pulling a colored rock out of a container.  When the rock is Red Darth Vader pays nothing, when the rock is Blue Darth Vader pays $40, and when the rock is White Darth Vader pays $100. The first ...
February 23, 2017

MAth
The odds against Rainbow winning the race are 17:5.  Brian bets $120 on Rainbow to win and Rainbow does win the race. How much money does Brian win? What was the probability that Rainbow was going to win the race? 
February 23, 2017

Maths
$12 000 is invested at 6% p.a. for 42 months. How much interest is earned each year and how much interest is earned after 2 years?
February 21, 2017

chem
What are the molality and mole fraction of solute in a 25.5 percent by mass aqueous solution of formic acid (HCOOH)? work this one out please i didnt understand
February 19, 2017

chemistry
What is the molality of a solution containing 11.1 g Na2SO4 dissolved in 2269.2 g of water? Just making sure would it be 11.1 divided by 2269.2 times 100?
February 19, 2017

Chemistry-Urgent
okay thanks so much dr. bob you're literally the reason i just passed my chemistry homework :)
February 19, 2017

Chemistry-Urgent
molality or mole fraction?
February 19, 2017

Chemistry-Urgent
for which one?
February 19, 2017

Chemistry-Urgent
thanks drbob222
February 19, 2017

Chemistry-Urgent
okay now last question..i didnt understand how you did this one (What are the molality and mole fraction of solute in a 25.5 percent by mass aqueous solution of formic acid (HCOOH)?
February 19, 2017

Chemistry-Urgent
im not actually suure im just not the best at chemistry and was very confused
February 19, 2017

Chemistry-Urgent
.0345
February 19, 2017

Chemistry-Urgent
oh .07817
February 19, 2017

Chemistry-Urgent
isnt that 1?
February 19, 2017

Chemistry-Urgent
oh 142.04
February 19, 2017

Chemistry-Urgent
is that .44068?
February 19, 2017

Chemistry-Urgent
so 1 divided by 2.2692
February 19, 2017

Chemistry-Urgent
so it would be 11.1 divided by 2269.2 times 100?
February 19, 2017

Chemistry-Urgent
What is the molality of a solution containing 11.1 g Na2SO4 dissolved in 2269.2 g of water?
February 19, 2017

Chemistry-Urgent
The partial pressure of CO2 inside a bottle of soft drink is 4.0 atm at 25°C. The solubility of CO2 is 0.12 mol/L. When the bottle is opened, the partial pressure drops to 3.0 ? 10-4 atm. What is the solubility of CO2 in the open drink? Express your answer in grams per ...
February 19, 2017

Chemistry-Urgent
What is the percent by volume of ethanol in a solution that contains 26 mL of ethanol dissolved in 113 mL of water? explain please
February 19, 2017

Chemistry
Thanks dr bob. can you help me with the rest
February 19, 2017

Chemistry
You have 1683.8 g of a bleach solution. The percent by mass of the solute sodium hypochlorite, NaOCl, is 3.62%. How many grams of NaOCl are in the solution? (show work Please)
February 19, 2017

Chemistry
DRboB im confused on how you worked this one
February 19, 2017

Chemistry
What are the molality and mole fraction of solute in a 25.5 percent by mass aqueous solution of formic acid (HCOOH)? (Explain how you got the answer please)
February 19, 2017

Solstudies
What is Williamsburg originally named
December 11, 2016

Math
What is the definition for composite
December 11, 2016

Math
What is the definition for composite
December 8, 2016

Language Arts
15. Read the following lines from the story “Forbidden Fruit.” Of course, in childhood there were occasions when I could have tasted pork in kindergarten or ate at the home of a friend, but I never broke the commandment. When we had rice and pork in kindergarten, I ...
December 6, 2016

Language Arts
Read the following passage. Then answer the questions that follow. THE OLYMPIC SWIMMER Who will be the winner bold? Athletes from both far and near Train and Strain to be the best. But who will win the medal gold? Swimmers swivel, splash, and kick Back and forth in a clear, ...
December 5, 2016

Language Arts
OK, thanks!
December 5, 2016

American Government
Has anyone done the Memo to the president portfolio? I am like...really stuck on it.
December 1, 2016

Math
14 bottles of water costs $56.How much would you pay for 50 such bottles?
November 28, 2016

history
wat year was abraham lincoln great great grandma born in.
November 1, 2016

Algebra
(3-2i)^2
September 27, 2016

Math
What is the distance, to the nearest tenth, from S(4,-1) to W(-2,3)
September 13, 2016

math
these are the options: One inch represented 1 foot in the first scale, but now 1 inch represents 4 feet in the second scale. One inch represented 4 feet in the first scale, but now 1 inch represents 3 feet in the second scale. One inch represented 54 feet in the first scale, ...
September 7, 2016

math
Rihanna planned a rectangular courtyard for a park and made a scale drawing using inches as the unit of measurement. She originally planned for the length of the actual courtyard to be 54 feet, but she decided to change it to 72 feet. If the length of the courtyard is 18 ...
September 7, 2016

math
40 = 25 + 15 and all multiples to it
September 7, 2016

Chemistry
Calculate the volume of 1.0 M CuSO4 stock solution you should use to make 100 mL of a 0.010 m CuSO4 solution.
September 1, 2016

Math
17degrees
August 11, 2016

Math
8th Grade Math 180degrees - (125degrees+38 degrees) = x degrees how do i solve this ?
August 11, 2016

Algebra
The variable Z is directly proportional to X. When X is 6, Z has the value 72. What is the value of Z when X = 13
July 24, 2016

Math
Marge bought a computer for $699 on the installment plan. The terms of the plan were a down payment of $100, then payments of $58 a month for 12 months. How much was her total cost?
June 15, 2016

Sxiences
A force of 200 N causes an object to accelerate at 2m/s^2. What is the object's mass?
June 1, 2016

Functions
A car has 16 gallons of gasoline in its tank when it starts it's journey. On a long highway trip, gasoline is used at a rate of about 2 gallons per hour. The gallons of gas, "g", remaining in the car’s tank after "t" hours can be modeled by the ...
May 12, 2016

Functions
You own two restaurants. From 1995 to 2000, the sales R1 (in thousands of dollars) for one restaurant can be modeled by: R1 = 480 – 8t – 0.8t2, t = 0, 1, 2, 3, 4, 5, where t = 0 represents 1995. During the same 6-year period, the sales R2 (in thousands of dollars) ...
May 12, 2016

Functions
You purchased a new car for $22,000. The value of the car decreases by 15% each year. Which function could be used to model the value of the car, "V", after "t" years?
May 12, 2016

Algebra
Simplify x/6x-x^2 A. 1/6-x; where x = 0,6** B. 1/6-x where x= 6 C. 1/6x where x=0 D. 1/6 Simplify 5x^3/7x^3+x^4 A. 5/7+x; where x = 0,-7 B. 5/7+x; where x=-7** C. 5/7x; where x = 0 D. 5/7
April 28, 2016

Calculus I
The volume of a sphere is changing at a rate of 8pi cm/sec. What is the rate of change of its surface area when the radius is 1? (the volume of a sphere is given by V=4/3pir^3 and its surface area, by A=4pi r ^2).
April 12, 2016

Physics
What is common to all light sources, including incandescent, fluorescent, neon, halogen, laser, and sodium vapor devices?
April 11, 2016

Consumer math Help please
You (or your parents) purchase a new car for $16,725.00 plus 6.15% sales tax. The down payment is $1,400.00 and you (or your parents) have an average credit rating. How much interest is accrued after the first month? Average Credit score APR (%)- Secured =5.85% Unsecured= 6.20%
April 8, 2016

English
Please help!
April 5, 2016

English
Which of the following quotes spoken by Juliet shows the strongest example of how she changes over the course of Romeo and Juliet? A. Madam I am here what is your will B. I'll look to like if looking liking move: but no more deep will I endart mine eye Than your consent ...
April 5, 2016

Math
The six faces of a fair cube are numbered 1 to 6. If the cube is rolled 300 times,what is the expected number of a 3 will land face up
March 18, 2016

Geometry
A model is made of a car. The car is 9 feet long and the model is 6 inches long. What is the ratio of the length of the car to the length of the model?
March 17, 2016

Algebra
Simplify (6x^-2)^2(0.5x)^4. I have no idea how to do this!, please help!
February 9, 2016

Math
735
January 7, 2016

Math
105
January 7, 2016

Math
8—(-2)
January 6, 2016

Science
so the answer would be 10.0 ?
January 6, 2016

Science
F/M=A So A=50/5.0 ? Am I correct ?
January 6, 2016

Science
Assuming a force of 50 N is applied to each object by each contestant, what is the acceleration of object A?_ B?_C?_ ( Person A's object is 5.0kg, person B's object is 2.5kg and C's is 0.5kg
January 6, 2016

Health PlZ HELP MEE!!!
You are correct for both answers.
January 6, 2016

Physics
A 2.6 kg rock is initially at rest at the top of a cliff. Assuming the rock falls into the sea at the foot of the cliff and that its kinetic energy is transferred entirely to the water, how high is the cliff if the temperature of 0.98 kg of water is raised 0.10°C? (Neglect...
January 5, 2016

PHYSICS
I'm just trying to look at the answers? How did i get here?
November 3, 2015

Chemistry
If your aspirin sample has an absorbance of 0.500 in a 1.00 cm cell, what will be its absorbance in a 1.50 cm cell. What would be the percent change in the absorbance if you used the larger cell and didn’t factor in the change in path length? The equation is y = 0.148X-0....
October 27, 2015

chemistry
What mass of water can be heated from 45C to 88C with 28 kj?
October 23, 2015

vocab (english)
sentence check 1 chapter 16 answer key
October 19, 2015

Math
a cell phone company offers the following plan: monthly charge (which includes 500 minutes) for $40 and a charge for additional minutes will be 5 cents a minute. write a piecewise function function putting x&y terms that can be used in any # or minutes. I am coming up with y=....
October 17, 2015

AP Physics
Two blocks are connected by a string over a frictionless, massless pulley such that one is resting on an inclined plane and the other is hanging over the top edge of the plane. The hanging block has a mass of 16 kg and the one on the plane has a mass of 8 kg. The coefficient ...
October 15, 2015

Chemistry
Describe in words how you would make a 1.00 M solution of HCl from a 5.00 M solution of HCl. Completely stumped here. Any help?
September 26, 2015

math
Laura drove to the mountains last weekend. There was heavy traffic on the way there, and the trip took 6 hours. When Laura drove home, there was no traffic and the trip only took 4 hours. If her average rate was 22 miles per hour faster on the trip home, how far away does ...
September 23, 2015

math
that isn't even an option thank you for the help
July 22, 2015

math
A135, 135A, 1A35, 13A5 A113, A123, A133, A143 0A23, 0a23,02A3, 02a3 1234, 5678, 0246, 1357
July 15, 2015

Language Arts
lee is wrong
April 23, 2015

history
is it a?
April 22, 2015

history
17. Under Franklin Roosevelt's Good Neighbor policy, A. the collective security among the nations of the Western Hemisphere declined. B. American commerce with Latin America increased, but only slightly. C. the Platt Amendment was rescinded. D. Cordell Hull favored ...
April 22, 2015

Math
There are 47 students in the marching band. There are 5 students in te first row, and the rest are in equal rows of 6. How many students are in each of the 6 rows?
March 22, 2015

Social Studies
is c.
February 25, 2015

math
Divide the 3 plants by 2 and you will get 44rows
February 3, 2015

history
Which statements describe the Persian Empire? Choose all answers that are correct. A. Darius I conquered all of Greece after defeating Athens at the Battle of Marathon. B. The Persians looked down on the culture and knowledge of the peoples they conquered. C. Cyrus oversaw a ...
January 27, 2015

Science
conduction
January 12, 2015

Algebra ASAP thx
I Thursday he read 81 pages
December 15, 2014

Physics
We always hear people say “You should conserve energy! Think of what will happen to the next generation if all our energy resources get depleted!” Is this in contradiction with the Law of Conservation of Energy which states that the total amount of energy in the ...
December 2, 2014

algebra
Solve system of equations to model the problem then solve: The length of a rectangle is 7 inches more than the width. The perimeter is 34 inches. Find the length and the width of the rectangle.
November 27, 2014

Algebra
Write a system of equations to model the problem and solve the system: The sum of two numbers is 156. What number is 28 more than the second number. What are the numbers?
November 27, 2014

Algebra
Write a system of equations to model the problem and solve the system: Benjamin has nickels and dimes and his toy bank he has a total of 45 coins the total value of $3.60. How many coins of each kind does he have?
November 27, 2014

Algebra
Write a system of equations to model the problem and solve the system: Benjamin has nickels and dimes and his toy bank he has a total of 45 coins the total value of $3.60. How many coins of each kind does he have?
November 26, 2014

Algebra
Write a system of equations to model the problem and solve the system: The sum of two numbers is 156. What number is 28 more than the second number. What are the numbers?
November 26, 2014

algebra
Solve system of equations to model the problem then solve: The length of a rectangle is 7 inches more than the width. The perimeter is 34 inches. Find the length and the width of the rectangle.
November 26, 2014

Math
A room measures 450cm by 350cm. Find the side if the largest square tile that can be used to tile without cutting
November 20, 2014

Pre Calculus
The logistic growth function P(t)= 160/ 1 + 9e^-0.165t describes the population of the endangered species of elk "t" years after they were introduced into the habitat. a. How many elk were initially introduced into the habitat? b. How many elk are expected after 6 ...
November 20, 2014

Pre Calculus
If a 25 mg sample of radioactive material decays to 18.4 mg in 5 years, how long will it take the sample to decay to 20.5 mg?
November 20, 2014

Pre Calculus
You invest $4500 into an account that earns 6.5% interest compounded monthly. How long will it take for the account to double in its value?
November 20, 2014

Pre Calculus
The population of a city is 127,000 and is decreasing by 2.4% each year. a. What will the population be in 10 years? b. Find when the population will be 95,000
November 20, 2014

Chemistry
Sort these species into isoelectronic groups. It doesn't matter which group goes in which box, so long as the correct species are grouped. Ne Mg2+ S2- Ti4+ K+ He Li+ Be2+ N3-
November 6, 2014

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