Monday

July 28, 2014

July 28, 2014

Total # Posts: 3,237

**Algebra**

Equation S=-16t^2 +100 write equation t^2 =

**Algebra**

In chemistry, n molecules of an ideal gas have pressure (P), volume (V), and temperature (T) that stand in the following relation, where R is a constant. PV = nRT If you solve for n what would be a good equation? I came up with n=PV/RT Some other choices are n= PV - RT n= PVRT

**algebra **

SOLVE A=bh for b I came up with b= A/h Am I correct?

**Algebra**

The formula for converting Celsius temperatures to Fahrenheit temperatures is F= 9/5C + 32 where F is the temperature in degrees Fahrenheit and C is the temperature in degrees Celsius. Which formula could be used to convert Fahrenheit temperatures to Celsius temperatures? Choi...

**Algebra**

An object which is dropped from 100 feet above ground falls according to the formula s = -16t^2 + 100, where s is the distance from ground level at time t. Which equation is equivalent to this formula? S-100 = t^2 ------- -16 S-100 = t^2 ------ 16 s - 100 = t^2 --- -16 or S-10...

**algebra**

Solve the following system of equations: x + 2y - z = 2 -3x + y + z = -9 x + y - 2z = 5 I came up with (-2,-11/3, -2) Is this correct?

**Algebra**

A farmer plans to plant 270 acres of his farm with wheat and soybeans. For every 2 acres of land planted with soybeans, the farmer wants to plant 7 acres of land with wheat. The farmer uses the following system of equations to determine how many acres of each crop he should pl...

**5th grade math**

Kat has 30 vehicles. Some are bicycles and some are cars. These vehicles have a total of 88 wheels. How many bicycles are there?

**ALGEBRA**

A golf ball is tossed straight down out of an airplane. The downward velocity of the ball at various times is given in the table below. SEC AFTER THROW DW VELOSCITY X m/s Y 1 21.8 1.6 27.68 2 31.6 2.2 33.56 What is the slope of the line that firs this data? Is it 7.8 8.8 9.8 o...

**Math**

Solve. 25x^4-15x^2+2=0

**math**

Multiply (b + (1)/(5)) (b + (1)/(3)) Simplify your answer

**math**

Jack usually mows his lawn in 4 hours. Marilyn can mow the same in 5 hours. How much time would it take for them to mow the lawn together?

**math**

Evaluate the polynomial for x = -2. Simplify your answer 3x² - 2x +2

**Math**

Use the quadratic formula to solve the equation. x² - x = -2 Type an exact answer, using radicals as needed. Express complex numbers in terms of i. Use integers or fractions for any numbers in the expression. Use a comma to separate answers as needed.)

**Math**

I need some help!!! Multiply (Simplify your answer) (4x +5)(9x² +2x +7)

**science**

Why is homework so important

**algebra**

-12x+10/5 = - x/20 I can't decide if I should cross multiply by -20 or just 20. The - is in the middle of the x and 20 (like a fraction) I came up with 2 possible answers: x=40/49 and x = 40/47

**algebra**

-12x+10/5 = - x/20 I can't decide if I should cross multiply by -20 or just 20. The - is in the middle of the x and 20 (like a fraction) I came up with 2 possible answers: x=40/49 and x = 40/47

**algebra**

Which of these is a function? y = 2x - 64 {(3, 6), (5, 8), (3, -6), (5, -8)} x = y^2 {(1, 3), (2, 4), (1, 4), (2, 3)} My answer y = 2x - 64 is this correct

**math**

a bag of marbles can be divided in equal shares among 2,3,4,5, or 6 friends. What is the least number of marbles that the bag could contain?

**Intro to Physical Science**

By what criteria might you determine whether a question might be answered using the scientific method?

**geometry**

I have a circle with a radius of 20in. Arc mEGF = 235(not shaded part of circle) find the area of arc EF (shaded sector of circle). My answer was 82.3 in^2 correct answer is 436.3 in^2 I need disrection on this one- I was really off on my answer.

**Geometry**

thanks for helping bob

**Geometry**

I missed this problem on my test. I had 23 ft and the correct answer was 16 ft. How should I of worked this problem? A trapezoid has base lengths of 8.5 and 14.5 feet with the area of 184 square feet. What is the height of the trapezoid? Thanks for your help!

**Geometry **

Need help I missed this problem on my test. My answer was 31.8in^2. The right answer was 8.0in^2 How should I have worked the problem: A pie has a diameter of 9 inches. Each slice of the pie has a central angle of 45 degrees. What is the area of each slice of pie?

**Geometry **

find the surface area of a right cylinder with a diameter of 4cm and a height of 6cm. Round to the nearest hundredth. Book answer is 100.53cm^2 I came up with 150.79cm^2 my work: 2rr(4)6)=150.79cm^2 What did I do wrong??

**Geometry **

The lateral area of a regular pyramid is 300 square units. The perimeter of its base is 100 units. Find the slant height of the pyramid. my answer is 5 units is this correct?

**Geometry**

A cylindrical flower pot with an open top needs to be painted. The height of the pot is 9 inches and the radius is 3 inches. If it takes Troy 5 minutes to paint 40 square inches, how long to the minute will it take him to paint the outside of the flower pot? I came up with 20 ...

**geometry**

Thank you so much Jai-that really cleared thing up

**geometry**

Find the surface area of a rectangular prism with a length of 8 inches, a width of 5 inches and a height of 2 inches. so far this is what I have- (2(8)+2(5))2=72 + 2(8.5)=80 my answer is 152in^2 the books answer is 132in^2 What did I do wrong???? Thanks for the help!

**math**

A Turbine 14 feet in diameter spins at 2,100 rotations a minute. How fast is a spot on the edge of the turbine going per minute? Using 22/7 for pi My answer is 92,400ft per min is this correct?

**algebra**

Sheila leaves her home to go to her sister's house, which is a 24-mile drive. The trip takes 36 minutes. She returns home taking the same route at a speed that is 5 miles per hour faster. How many minutes did the trip home take? I came up with 33 is this correct?

**Chemistry**

if some volatile impurities in the crucible are not burned off in step 1 but are removed in step 4 is the reported percent mass of water in the hydrated salt too high or too low?

**physics**

Three objects -- two of mass m and one of mass M -- are located at three corners of a square of edge length l. Find the gravitational field g at the fourth corner due to these objects. (Express your answers in terms of the edge length l, the masses m and M, and the gravitation...

**physics**

Three objects -- two of mass m and one of mass M -- are located at three corners of a square of edge length l. Find the gravitational field g at the fourth corner due to these objects. (Express your answers in terms of the edge length l, the masses m and M, and the gravitation...

**physics**

A particular tower clock similar to Big Ben has an hour hand 2.70 m long with a mass of 62.0 kg, and a minute hand 4.80 m long with a mass of 100 kg. Calculate the total rotational kinetic energy of the two hands about the axis of rotation. (You may model the hands as long thi...

**chemistry**

I need help on a few of these. A. How many protons are in one atom of fluorine - 19? B. How many neutrons are in one atom of potassium - 39? C. How many electrons are in one neutral atom of V - 51? D. What is the symbol for the element that has 78 protons? E. What is the symbo...

**Chemistry**

A 230. mL air sample collected at 35°C has a pressure of 550. torr. What pressure will the air exert if it is allowed to expand to 425 mL at 60.°C?

**Chemistry**

What is the pressure of 495 mL of oxygen gas at 30.5°C and 710. mm Hg if the conditions are adjusted to 310. mL and 80.5°C? Assume the amount of gas is held constant.

**Chemistry**

A closed container with a mixture of hydrogen, helium, and argon has a total pressure of 3.00 atm. The partial pressure of hydrogen is 0.550 atm and the partial pressure of argon is 615 mm Hg. What is the partial pressure of helium?

**Chemistry**

What is the volume of 150. mL of oxygen gas at 72.0°C and 110. mm Hg if the conditions are adjusted to 750. mm Hg and 82.5°C? Assume the amount of gas is held constant.

**Chemistry**

What is the final volume of 945 mL of neon gas at 174°C if the gas is cooled to 58.5°C? Assume the pressure and the amount of gas are held constant.

**Chemistry**

To what Celsius temperature must 32.5 mL of methane gas at 60.0°C be changed so the volume will be 62.0 mL? Assume the pressure and the amount of gas are held constant.

**Business & Society**

What are two forces that you believe shape the relationship between business and society?

**math**

weekly take home pay for those 20 graduate teaching assistants from university z: 500.75, 217.43, 488.25, 405.78 485.46, 495.48, 370.75, 435.40 479.65, 482.56, 470.28, 489.90 382.50, 500.75, 465.32, 481.25 506.43, 225.50, 504.38, 179.25 1. what are the mean and standard deviat...

**accounting**

Compute inventory turnover for 2005 and 2004. The inventory balance at December 31, 2003, was $294 million. Do the trend of net income from 2004 to 2005 and the change in the rate of inventory turnover tell the same story or a different story? Explain your answer.

**Science**

An 850 N Skydiver experiencing 200 N of air resistance? Calculate.

**math**

weekly take home pay for those 20 graduate teaching assistants from university z: 500.75, 217.43, 488.25, 405.78 485.46, 495.48, 370.75, 435.40 479.65, 482.56, 470.28, 489.90 382.50, 500.75, 465.32, 481.25 506.43, 225.50, 504.38, 179.25 1. what are the mean and standard deviat...

**chemistry**

15.45 grams of solid potassium chlorate decomposes when heated to form potassium chloride and oxygen gas. assuming 100% yeild how many grams of solid potassium will be produced?

**physics**

A car drives 100 meters at 30 degrees north of east, stops, turns to an angleof 210 degrees from the east, and then drives another 60 meters. What is the magnitude of the total displacement?

**Geometry - Bob**

Problem : Howm do you find the area of a circle circumscribed about a regular pentagon with a perimeter of 50 inches. So far I each side of pentagon is 10. How do I find the radius of the circle? Is this the correct direction to go? I your link & I was unable to come up with t...

**Geometry**

Find the area of a trapezoid ABCD with verticles A(2,2) B(4,6) C(4,-3) and D(2,-1). Should I use a graph and go from there? I'm just not sure of how to set this up. The book answer is 12units. I am not coming up with the answer

**Geometry**

Problem : Howm do you find the area of a circle circumscribed about a regular pentagon with a perimeter of 50 inches. So far I each side of pentagon is 10. How do I find the radius of the circle? Is this the correct direction to go?

**Geometry **

Rhombus ABCD has an area of 264 square units. If DB=12 units find AC. So far this is what I have- 1/2(264)=132 132/2=66 66-12=44units Is this the correct process?

**Geometry**

Find the area of a trapezoid ABCD with verticles A(2,2) B(4,6) C(4,-3) and D(2,-1)

**Geometry**

Find the area of a nonagon with a perimeter of 126 inches. Round to the nearest tenth.

**Geometry**

Find the area of a regular hexagon with side length of 10 centimeters. Round to the nearest tenth.

**english**

thank you. Now I need to combine the sentences by changing the italicized word group to an infinitive or infinitive phrase. The weather bureau uses balloon. They determine the temperature aloft. the italicized words are - they determine the temperature aloft.

**english**

I watch for the sales

**english**

I need to combine the following sentence by changing the Italicized group of words into a gerund or gerund phrase. Then write the complete sentence using (prepositional phrase with a gerund object) I watch for the sales. This way I save money.

**math**

25 pea pods were broken apart and the number of peas in each pod recorded. The record looked as follows: # peas in pod; 2,3,4,5,6 and frequency; 7,9,5,3,1 Make a histogram for this data, does this data appear to be skewed? What is the model class for this survey?

**psychology**

Are the cognitive intervention tools: operant conditioning, cognitive rehearsal, positive reinforcement, and journaling? I just want to know if this is correct.

**chemistry**

if you start with ten grams of lithium hydroxidr, how many grams of lithium bromide will be produced

**SCI 275**

Do you think I should write a completley different paper? Is any part of my paper good? I orginally wanted to write about the pros and cons of wind energy but did not know how to go about it. I did not think I could meet my word requirements.

**SCI 275**

. Final Project: Mitigation Strategies and Solutions • Resource: Appendix A • Use the topic you chose for the Capstone Discussion Question or choose another topic you have learned about over the past 8 weeks. • Focus on a specific environmental problem in your t...

**Math**

A= 3pi r squared?

**Math**

Yes, sorry about that.

**Math**

Which of the following formulas could be used to calculate the combined area,x of threw identical circles? A. X= 3pie r squared B. X= 6 pie r C. X= pie r squared/ 3 D. X= 6 r/ pie

**math**

I need to know when you have lettets how csn you deternine what the numbers will be. Ex: GRAPE - PLUM = APPLE. How would I he able to know what numhers represent the letters? Thanks

**statistics**

A resher ranoumly selects and intreviews 10 male and 100 female college teacher. type of sampling technique?

**science**

Imagine a marble dropped from a tall building at 1.62 meters per second. How long would the marble be in the air. Velocity= Gravitational acceleration x time

**english**

Carl showes self-hatred. Also known as the death drive in the book when he says "I hate my life I want to die right now."

**Physics**

A sled of mass 5.98 kg is coasting along on a frictionless ice-covered lake at a constant speed of 1.42 m/s. A 1.98-kg book is dropped vertically onto the sled. At what speed does the sled move once the book is on it?

**social studies**

The knights role and fall of feudalism

**math**

If the cost of a cell phone has decreased 400% during the past 10 years, does that correspond to a decrease of four times?

**Chemistry**

Calculate the pH after 0.10 mol of HCl is added to 1.00 L of the solution that is 0.57 M HF and 1.13 M KF. I got 3.01, but it is wrong. What did I do wrong?

**Physics**

Initially, mass one (2.10 kg) has a velocity of 5.90 m/s and mass two (2.80 kg) is at rest. After they collide, mass one emerges at an angle theta = 33.0 degrees. What is the speed of mass one after the collision if the collision is completely elastic? (Note, there are actuall...

**Physics**

Initially, mass one (2.10 kg) has a velocity of 5.90 m/s and mass two (2.80 kg) is at rest. After they collide, mass one emerges at an angle theta = 33.0 degrees. What is the speed of mass one after the collision if the collision is completely elastic? (Note, there are actuall...

**math**

m=-2/3; b=45

**Biology**

Will iodine react with sucrose or glucose? I would say no, because it reacts with starch, a polysaccharide, and glucose is a monosaccaride and sucrose is a combination of fructose and glucose, two monosaccharides. Am I right? Why or why not? How does iodine cause a reaction to...

**math**

There are two red cards in each suit that are multiples of ten: 5 and 10. There are two red suits: hearts and diamonds. Therefore there are four cards that are red AND multiples of 10. Your chances of drawing a red card that is a multiple of ten is then 4 out of 52. Reduce to ...

**Biology**

Sra - PLEASE DO NOT REPLY WITH WEBSITES!!! (This one didn't even work :-P). People then do not give legitimate answers because they think the question has already been answered. In addition, I only post on here when I have exhausted the Internet searching for answers to my...

**Biology**

Will iodine react with sucrose or glucose? I would say no, because it reacts with starch, a polysaccharide, and glucose is a monosaccaride and sucrose is a combination of fructose and glucose, two monosaccharides. Am I right? Why or why not? How does iodine cause a reaction to...

**maths**

There are 1000 gm in a kilogram. Therefore, 1 kg 400 gm is the same as 1 400/1000 kg. Reduce your fraction and you have your answer.

**Chemistry**

How many atoms of each element are present in five formula units of calcium permanganate?

**chemistry abs spectrum and wavelength analysis**

Wow! Thank you, that makes a lot of sense! I know what you mean by successive approximations, I didn't think of it like that before.. Thank you so much again :)

**chemistry abs spectrum and wavelength analysis**

Hello, can someone please help me? I'm stuck on a question: I'm doing an analysis of the absorbance of FeSCN2+ at it's max wavelength (i.e. 450nm where abs=0.154)The species I used to make the solution tested were Fe(NO3)3, HNO3, and KSCN. Now, the question is: Sup...

**chemistry abs spectrum and wavelength**

Hello, can someone please help me? I'm stuck on a question: I'm doing an analysis of the absorbance of FeSCN2+ at it's max wavelength (i.e. 450nm where abs=0.154)The species I used to make the solution tested were Fe(NO3)3, HNO3, and KSCN. Now, the question is: Sup...

**Chemistry**

An excess of aqueous AgNO3 reacts with 24.5 mL of 5 M K2CrO4(aq) to form a precipitate. What is the precipitate? Answer: Ag2CrO4 What mass of precipitate is formed? Answer in units of g.

**8th grade science**

how do I draw Isomers for octane

**chemistry**

If 100 grams of a saturated solution of lead nitrate is cooled from 60c to 20c, what will happen

**chemistry**

Aluminum has a specific heat capacity of 0.903J/g degree celsius. What mass of aluminum in g would require 500j of heat to raise its temperature by 12.5 degrees celsius

**Physics**

^Thanks

**Physics**

Two girls are at the same point on one side of a river that is 40m wide with a current flowing at 1.00m/s. Simultaneously, the dive into the water in an attempt to swim to the other bank of the river directly across from where they started. Both swim at 2m/s relative to the wa...

**health,safety,nutrition training for early childho**

what are some considerations for the development of well-defined health,safety and nutrition practices for an early learning environment

**accounting**

The columns of the employee earnings record do consist of the amounts withheld for the current pay, and the amounts withheld YTD, that are accumulated.

**Physical science**

what are your name

**math**

6.6+.8x=0.2 what does x equal

**chemistry**

how many grams of lithium sulfate will be formed when 25 grams of sulfuric acid react with an excess of lithium hydroxide in the following reaction

**history**

thanks!

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