Posts by Brianna

Total # Posts: 768

Texas History
How is urbanization related to popular culture as seen in Texas in the 1920s?

Algebra 1
Brianna needs to earn a C in her Geology class. Her current test scores are 65, 67 67, and 93. Her final exam is worth 6 test scores. In order to earn a C Brianna's average must lie between 70 and 79 inclusive. What range of scores can Brianna receive on the final exam to ...

ASAP Physics
so a is 3.5 times 9.81 then add 1.6?

ASAP Physics
what is g?

ASAP Physics
A small first-aid kit is dropped by a rock climber who is descending steadily at 1.6 m/s. (a) After 3.5 s, what is the velocity of the first-aid kit? (b) After the 3.5 s, how far is the kit below the climber?

ASAP Physics
confused

ASAP Physics
A worker drops a wrench from the top of a tower 118.5 m tall. What is the velocity when the wrench strikes the ground?

physics
A car starts from rest and travels for 4.1 s with a uniform acceleration of +1.4 m/s2. The driver then applies the brakes, causing a uniform acceleration of -1.8 m/s2. The breaks are applied for 1.80 s.

physics HELP
A car starts from rest and travels for 4.1 s with a uniform acceleration of +1.4 m/s2. The driver then applies the brakes, causing a uniform acceleration of -1.8 m/s2. The breaks are applied for 1.80 s.

physics HELP
any physics teacher can help me ??????

physics HELP
A sailboat starts from rest and accelerates at a rate of 0.18 m/s2 over a distance of 494 m. (a) Find the magnitude of the boat's final velocity. (b) Find the time it takes the boat to travel this distance.

help physics
It takes a runner 3 h, 32 min, 26 s to run a marathon. If the distance of a marathon is 42.2 km, what is the average speed of the runner?

physics
anyone know?

physics
It takes a runner 3 h, 32 min, 26 s to run a marathon. If the distance of a marathon is 42.2 km, what is the average speed of the runner?

physics
i dont understand

physics
Runner A is initially 2.4 km west of a flagpole and is running with a constant velocity of 7.6 km/h due east. Runner B is initially 7.6 km east of the flagpole and is running with a constant velocity of 4.4 km/h due west. What will be the distance of the two runners from the ...

Math
Need help putting this into a linear equation. In 2017 there were 850 graduates, however, in 2018 there is an expected decline of 15% due to increased tuition cost. What is the expected graduation total for 2018?

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

science
can somebody put all the answers to the test

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 ?

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