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Posts by brianna

Total # Posts: 742

Math
Find the? x-coordinate of the vertex of a parabola that passes through the points (0,6) and (8,6)

Math
In a pen the farmer counts 20 pigs and geese for a total of 70 legs. How many animals are there for each kind?

math algebra
$199.99 smartphonde on sale for $167. what percentage decrease is this 99

Chemistry-Urgent
A gas at 61°C occupies a volume of 0.67 L. At what Celsius temperature will the volume increase to 1.12 L? whats the answer didn't understand

chem
Air trapped in a cylinder fitted with a piston occupies 162.2 mL at 1.08 atm pressure. What is the new volume when the piston is depressed, increasing the pressure by 25%? what is the answer? didnt understand?

Math
In what proportion should you combine 2:5 soaking solution and distilled water to create 1:20 solution?

chem
is that right

chem
this is what i got 273.0022467

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?

chem
so is it .995 times 4.33 divided by 32 +273 =.720 V2 / -10.2 + 273

chem
A weather balloon is filled with helium that occupies a volume of 4.33 104 L at 0.995 atm and 32.0°C. After it is released, it rises to a location where the pressure is 0.720 atm and the temperature is -10.2°C. What is the volume of the balloon at that new location?

chemistry
can you explain?

chemistry
A fixed amount of oxygen gas is held in a .500 L tank at a pressure of 4.68 atm. The tank is connected to an empty 1.50 L tank by a tube with a valve. After this valve has been opened and the oxygen is allowed to flow freely between the two tanks at a constant temperature, ...

chem
The pressure of a sample of helium in a 3.35 L container is 0.988 atm. What is the new pressure if the sample is placed in a 2.94 L container?

chem
is it 1.23?

chem
i dont understand

chem
Air trapped in a cylinder fitted with a piston occupies 162.2 mL at 1.08 atm pressure. What is the new volume when the piston is depressed, increasing the pressure by 25%?

chem
/ is divide?

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?

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

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 ...

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 ...

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? 

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?

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

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?

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

Chemistry-Urgent
molality or mole fraction?

Chemistry-Urgent
for which one?

Chemistry-Urgent
thanks drbob222

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)?

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

Chemistry-Urgent
.0345

Chemistry-Urgent
oh .07817

Chemistry-Urgent
isnt that 1?

Chemistry-Urgent
oh 142.04

Chemistry-Urgent
is that .44068?

Chemistry-Urgent
so 1 divided by 2.2692

Chemistry-Urgent
so it would be 11.1 divided by 2269.2 times 100?

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

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 ...

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

Chemistry
Thanks dr bob. can you help me with the rest

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)

Chemistry
DRboB im confused on how you worked this one

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)

Solstudies
What is Williamsburg originally named

Math
What is the definition for composite

Math
What is the definition for composite

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 ...

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, ...

Language Arts
OK, thanks!

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

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

history
wat year was abraham lincoln great great grandma born in.

Algebra
(3-2i)^2

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

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, ...

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 ...

math
40 = 25 + 15 and all multiples to it

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.

Math
17degrees

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

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

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?

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

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 ...

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) ...

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?

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

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).

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

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%

English
Please help!

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 ...

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

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?

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

Math
735

Math
105

Math
8—(-2)

Science
so the answer would be 10.0 ?

Science
F/M=A So A=50/5.0 ? Am I correct ?

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

Health PlZ HELP MEE!!!
You are correct for both answers.

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...

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

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....

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

vocab (english)
sentence check 1 chapter 16 answer key

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=....

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 ...

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?

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 ...

math
that isn't even an option thank you for the help

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

Language Arts
lee is wrong

history
is it a?

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 ...

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?

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