Monday

March 2, 2015

March 2, 2015

Total # Posts: 617

**Math**

Factor the polynomial 4x^2- 81
*February 25, 2013*

**Physics**

A bicycle wheel of radius 0.30 m is spinning at a rate of 60 revolutions per minute. What is the centripetal acceleration of a point that is 0.11 m from the outer edge of the wheel?
*February 17, 2013*

**maath HELPPPP**

a ball is thrown into the air at a speed of 96 feet/sec. The equation that expresses the height of the ball as a function of time is: h(t) = -16t2 + 96t + 5 How long does the ball stay in the air after it is thrown? (Round answer to the hundreths of a second)
*February 14, 2013*

**math **

a ball is thrown into the air at a speed of 96 feet/sec. The equation that expresses the height of the ball as a function of time is: h(t) = -16t2 + 96t + 5 How long does the ball stay in the air after it is thrown? (Round answer to the hundreths of a second)
*February 14, 2013*

**Languege arts**

1. Which is the BEST summary of "LAFFF"? (1 point) Angela used a time machine to win a writing contest. Peter and Angela invented a time machine. Peter used a time machine to travel to the future. 2. The author describes Peter's Halloween costume in order to (1 ...
*February 7, 2013*

**Physics**

It's definitly 1J
*January 23, 2013*

**math**

The area of a parallogram is 128 sq miles . Find its base &height . 2x-4. 2x+ 4
*January 23, 2013*

**math**

What is a negative 588 divided by two numbers that equal the sum of 7?
*January 23, 2013*

**help math**

A boat travels down the river in 3.0 hours. The return trip up river takes 3.6 hours. A one way trip down or up river is a distance of 23 miles. If the boat is traveling at maximum speed, what is the boats speed measured in waters with no current? You need to use systems to ...
*December 17, 2012*

**math quick help**

Bernie put in a garden in her back yard. The garden has a perimeter of 195 feet. She wants to know the total surface area of the garden and all she knows is the perimeter and that the width is 20% or (1/5) of the length. (Remember 20% and the fraction 1/5 is the same decimal ...
*December 17, 2012*

**help mathhh!!!**

which one would represent the water with no current?
*December 13, 2012*

**help mathhh!!!**

A boat travels down the river in 2.3 hours. The return trip up river takes 3.7 hours. A one way trip down or up river is a distance of 26 miles. If the boat is traveling at maximum speed, what is the boats speed measured in waters with no current? You need to use systems to ...
*December 13, 2012*

**math (precalc)**

Point S is 4 km west of point R, and point T is 4 km southwest of S. Find the bearing and distance from R to T. (If possible, show diagrams too, please! Thanks in advance.)
*December 13, 2012*

**Math**

Sue was in excellent shape in high school, she could ride her 10-speed bicycle 4.8miles to her grandmother's house in 11 minutes. Her return trip home took 14 minutes. The times are different due to there being a slight downhill slop on part of the trip to her grandmothers...
*December 9, 2012*

**Math**

How do you set this up? Solve the system using substitution: A boat travels 18 miles downstream in 1.5 hrs. It then takes the boat 3 hrs. to travel upstream the same distance. Find the speed of the boat in still water and the speed of the current. Thanks you!!!
*December 6, 2012*

**Chemistry**

What type of bonds(sigma or pi) and how many of each are used to form a triple bond?
*December 3, 2012*

**chemistry**

what theory describes how negatively charged electron orbitals orient around a positvely charged nucleus?
*December 3, 2012*

**English**

"I watched Hassan get raped," I said to no one. Baba stirred in his sleep. Kaka Homayoun grunted. A part of me was hoping someone would wake up and hear, so I wouldn't have to live with this lie anymore. But no one woke up and in the silence that followed, I ...
*December 2, 2012*

**English**

Sorry, "dozed" should be "dozen" in the quote .
*December 2, 2012*

**English**

"Well the two of us can have fun together," I said. Baba smiled. Winked. "Dress warm," he said. It should have been just the two of us--that was the way I wanted it--but by Wednesday night, Baba had managed to invite another two dozed people." (p. 87) ...
*December 2, 2012*

**Math 8R - HW Qs. Check**

(-2)2 = -4 (you said positive 4, I don't know if it was a typo, or...) Having said that, all should be correct... I'm confused. Did you copy the question correctly?
*December 2, 2012*

**College Physics 1**

A mass is oscillating on a spring with a period of 4.60s. At t=0s the mass has zero speed is at x=8.30cm. What is the value of t the first time after t=0s that the mass is at x=4.15 cm?
*November 28, 2012*

**social studies**

In early Korea what were the strongest influences?
*November 18, 2012*

**Math**

Can you please help me with this? Convert 36.7 lbs/in(3) to kilograms per cm(3). (There are 14.59 kilograms in 32.174 pounds and 61.02 in(3) in 1000 cm(3)). Thanks!
*November 18, 2012*

**social studies**

thank you so much!
*November 18, 2012*

**social studies**

what was Europe's major religion during the Enlightenment period?
*November 18, 2012*

**chemistry**

0.24 grams of benzene (C6H6) is dissolved into 4.9 grams of melted biphenyl. The freezing point of the mixture was determined to be 4.4 degrees below the freezing point of pure biphenyl. Based on these results, what is the Kf of biphenyl? (Use the standard units in your ...
*November 13, 2012*

**Chemistry**

If a 11.0 mL sample of vinegar (aqueous acetic acid ) requires 19.0 mL of 0.500 M NaOH to reach the endpoint, what is the original molarity of the acetic acid solution?
*October 29, 2012*

**Physics**

A roller coaster travels 29.1 m at an angle of 34.0 above the horizontal. How far does it move horizontally?
*October 23, 2012*

**Physics**

A descent vehicle landing on the moon has a vertical velocity toward the surface of the moon of 38.8 m/s. At the same time, it has a horizontal velocity of 54.3 m/s.At what speed does the vehicle move along its descent path
*October 23, 2012*

**Chemistry**

Calculate the number of carbon atoms in 0.75 L of acetone (CH3COCH3). (density=1.3g/mL and boiling point=48.5 degrees)
*October 22, 2012*

**Can you help me make my thesis sound clear & good**

In the short story, "how much land does a man need," the author Leo Tolstoy would describe that human worth based on shallow measurements such as wealth and possessions make true love and humanity impossible because of greediness, the devil filling our minds with ...
*October 15, 2012*

**Algebra 2**

x+2y+5z=-1 2x-y+z=z 3x+4y-4z=14 solve the system using linear combination method.
*October 14, 2012*

**english/essay writing help**

Hello! So Im having trouble with my thesis statement for an essay. My teacher gave us three questions to answer and make the answers into a thesis statement. heres the questions and instructions: Does defining human worth based on shallow measurements, such as wealth and ...
*October 14, 2012*

**chemistry**

a glass jar containing .27 mol of Nitrogen with a leaky lid is heated from room temperature 22 celcis to 150 celcis. How many moles of Nitrogen remain? How many gtams?
*October 12, 2012*

**Chemistry**

What mass (g) of KHP is required to neutralize 10.00 mL of 0.1092 M NaOH?
*October 9, 2012*

**Chemistry**

How many mL of the 0.1029 M standard NaOH solution is required to titrate 0.2247 g sample of KHP to the phenolphthalein end point?
*October 9, 2012*

**Chemistry**

What mass of NaOH is required to prepare 500.0 mL of 0.1029 M stock solution?
*October 9, 2012*

**chemistry**

How many grams of Kl are required to prepare 500 mL of 0.04 M Kl?
*September 25, 2012*

**Chemistry**

A bottle of wine contains 11.4% ethanol by volume. The density of ethanol (C2H5OH) is 0.789 g/cm3. Calculate the concentration of ethanol in wine in terms of mass percent and molality.
*September 23, 2012*

**Chemistry**

density of water and the antifreezer is 0.9975 g/mL and 1.141 g/mL I got molality of 54.5 and molar mass 18.33g.
*September 23, 2012*

**math**

how to solve 2x-9/3=8-3x
*September 20, 2012*

**Social Studies**

mexico,canada,U.S
*September 20, 2012*

**math**

thnx
*September 20, 2012*

**math**

how do you solve 4(3d-2)=8d-5
*September 20, 2012*

**Math**

ask your teacher for tutoring or find out if there are any tutoring classes in ur school. (good luck)
*September 20, 2012*

**Biology **

Down syndrome or trisomy 21, in humans is caused by an extra copy of relatively small chromosome 21. if a male with down syndrome could have children what is the likelihood that his children will also have down syndrome? a. 0 b. 25 c.50 d. 75 e. 100
*September 3, 2012*

**English**

Thank you Ms. Sue!
*August 26, 2012*

**English**

Could you help me find the "simple subject" and "simple predicate" in the following sentence please? "It is going to rain tomorrow." Thank you!
*August 26, 2012*

**Math**

The area of a square is 10 square meter. what is the product of the lengths of the diagonals of the square?
*August 22, 2012*

**math problem**

I have to find the area of a 14 yd square...the answer is the number plus the units squared
*July 13, 2012*

**physics**

A 9.1 g ball is hit into a 98 g block of clay at rest on a level surface. After impact, the block slides 8.0 m before coming to rest. If the coefficient of friction is 0.60, determine the speed of the ball before impact.
*June 22, 2012*

**trigonometry**

an automobile tire has a diameter of 36 inch.how many revolution will the wheel make an arc the automobile travels 1 mile (5280 A)?
*June 21, 2012*

**chemistry**

I am given the concentration of HClO4 and a pressure for H2... how do i plug either of the givens into the equation youve shown??
*June 18, 2012*

**chemistry**

calculate the reduction potential for hydrogen ion in a system having a perchloric acid concentration of 2.00 x 10^-4 M and a hydrogen pressure of 2.50 atm.
*June 18, 2012*

**chemistry**

will fe3+ oxidize Sn2+ to Sn4+ in acidic solution?
*June 18, 2012*

**chemistry**

the time is supposed to be 4.6 hours. i am not having problems getting the mass of Cu, i am just struggling with how to find how long it will take.
*June 18, 2012*

**chemistry**

i get 4.76 x 10^-5 mol CaC2o4.. squaring the answer gives me a ksp= 2 x 10^-9 is this right?
*June 10, 2012*

**chemistry**

a liter of a solution saturated at 25C with CaC2O4 is evaporated to dryness giving a 0.0061 gm residue of CaC2O4. Calculate the concentrations of the ions, and the molar solubility and the solubility product constant for this salt at 25C. Show the balanced reaction.
*June 10, 2012*

**Elementary Statistics**

1) Construct a confidence interval of the population proportion at the given level of confidence. x=60,n=300, 99% confidence. The 99% confidence interval is (_,_) 2) A researcher wishes to estimate the proportion of adults who have high-speed internet access. What size sample ...
*June 6, 2012*

**World History**

Who ruled the Byzantine Empire?
*May 29, 2012*

**Chemistry**

Ammonia reacts with oxygen at 120 C to form NO and H20 in a sealed 40-L container. When 34 g of ammonia reacts with 96 g of oxygen, what is the partial pressure of the NO? What is the total pressure?
*May 20, 2012*

**English**

Thank you, Writeacher! This question comes from online schools affiliated with K12. I am constantly finding students who use these sites to copy answers. Liz, did you ever think of reading the lessons the school provides or of contacting your instructor?
*May 13, 2012*

**Math**

What is the x-coordinate of the image of P(5,11) under R-0,90*-?
*April 15, 2012*

**Math**

What are the coordinates of the image of the point P(4,25) under R-o, 180*-, where O is the origin?
*April 15, 2012*

**Math**

Consider the points P(20, 20), X(a,b) and Y(a+20, b+20). Is Y=T-op-(X), where Ois the origin. explain
*April 15, 2012*

**Math**

Find the image of the point P(-11, -34) after 6 successive half turns about the point C(-11, 0)
*April 15, 2012*

**Math**

The image of the point P(-38, 127) when reflected over the line y=x is...
*April 15, 2012*

**Trig **

i dot geht thhis werlk? cahn sumwone elp meh?
*April 5, 2012*

**Physics**

A bullet of mass 0.06kg is fired horizontally with a muzzle speed of 700 m/s into a pendulums hanging block of mass 2.0kg. The block and the bullet then move up a height, h, above the pendulums equilibrium position. What is the speed of the bullet/block combination after the ...
*March 15, 2012*

**algebra..**

Thank you so much !
*March 13, 2012*

**algebra..**

Write an aquation in standad form that satisfies the given conditions: Paralled to the x-axis and through ( 4, -1)
*March 13, 2012*

**chemistry**

How do you do the hybridization of CBr4?
*March 5, 2012*

**physical science**

In raising a 5000-N piano with a pulley system, the movers note that, for every 2m of rope pulled down, the piano rises 0.3m. Ideally, show that the force required to lift the piano is 500-N.
*February 28, 2012*

**Algebra**

You operate a gaming Web site, where users must pay a small fee to log on. When you charged $3 the demand was 520 log-ons per month. When you lowered the price to $2.50, the demand increased to 780 log-ons per month. (a) Construct a linear demand function for your Web site and...
*February 21, 2012*

**Algebra 2**

You are cooking chili. When you take it off the stove, it has a temperature of 205°F. The room temperature is 68°F and the cooling rate of the chili is r = 0.03. How long will it take to cool to a serving temperature of 95°F
*February 20, 2012*

**Math**

1 bounce=32 2 bounce=16 3 bounce=8 4 bounce=4 5 bounce=2 6 bbounce=1
*February 20, 2012*

**English**

When there is change in reactant, product, or temperature the equilibrium position will shift in a direction that tends to decrease change in this situation. When the concentration of one of the products of an equilibrium reaction is higher than the other, then the solution ...
*February 20, 2012*

**Geometry Are these two triangles similar? Thanks!**

ya
*February 20, 2012*

**physics 213**

Two newly discovered planets follow circular orbits around a star in a distant part of the galaxy. The orbital speeds of the planets are determined to be 44.7 km/s and 56.2 km/s. The slower planet's orbital period is 8.61 years. (a) What is the mass of the star? (b) What ...
*February 19, 2012*

**math 12**

The world's population is 1970 was about 3.6 billion. If the population has increased at 2% each year since then, what will the world's population be in 2010?
*February 14, 2012*

**physics 213**

A duck has a mass of 2.80 kg. As the duck paddles, a force of 0.120 N acts on it in a direction due east. In addition, the current of the water exerts a force of 0.190 N in a direction of 48.0 ° south of east. When these forces begin to act, the velocity of the duck is 0....
*February 3, 2012*

**physics **

During a circus performance, a 74.8-kg human cannonball is shot out of a 18.0-m-long cannon. If the human cannonball spends 0.844 s in the cannon, determine the average net force exerted on him in the barrel of the cannon.
*February 1, 2012*

**Pre-Algebra**

Help! I am not really good with story problems! Forest rangers measure a depth of 82" of snow on a mountain peak at 8am. Snow is expected to fall at a steady rate of 3/4" per hour throughout the day. A) write an equation that approximates the depth of 'y' of ...
*January 30, 2012*

**physics **

In the javelin throw at a track-and-field event, the javelin is launched at a speed of 35.0 m/s at an angle of 33.7 ° above the horizontal. As the javelin travels upward, its velocity points above the horizontal at an angle that decreases as time passes. How much time is ...
*January 26, 2012*

**Physics **

Relative to the ground, a car has a velocity of 14.8 m/s, directed due north. Relative to this car, a truck has a velocity of 24.0 m/s, directed 52.0° north of east. What is the magnitude of the truck's velocity relative to the ground?
*January 26, 2012*

**Math**

What is the range of y= -(x-2)^2+2 ?
*December 31, 2011*

**english**

What do you know about the fact? I have to write a research paper about Genocide. It must have a body and conclusion
*December 19, 2011*

**math**

16b to the 8th power + 40b to the 7th power + 25b to the 6th power
*December 14, 2011*

**science**

Why are proteins necessary in your body? What are polymers that build up to make proteins?
*December 9, 2011*

**Algebra 2**

How would you graphy this question and also solve for the intercepts: y=2(x-3)^2-1
*December 2, 2011*

**science-biology**

it is a recessive gene
*December 2, 2011*

**Physics 12**

An alpha particle is accelerated by a voltage of 1.53*10^3 V and is then deflected by a magnetic field of strength 0.020 T into a circular path of radius 0.40 m. If the alpha particles have a charge of 3.2*10^-19 C, what is their mass?
*December 1, 2011*

**chemistry**

how would you prepare 300 ml of a 10% CaCl2 solution (w/w)?
*November 29, 2011*

**biotech**

how would you prepare 300 ml of a 10% CaCl2 solution (w/w)?
*November 29, 2011*

**college math**

use long division 1.2x3+3x2-17x+1 /x-2 2.y3+3y2+1 /y-2 3.n5-n2 /n2-n
*November 11, 2011*

**7th Math**

add 12 16 and 18. then find the LCD of 3/4 and 1/2. the LCD would be 4. hope this helps!
*October 27, 2011*

**Math :(**

jerome and tyler meet in the local pizza parlor after their saturday afternoon soccer game. Eash boy bought a separete pizza with an agreement to share with each other, both at the restraunt and in what they would each take home. jerome ate 1/4 of a pizza and Tyler at 2/3 of a...
*October 27, 2011*

**English **

Lord of the Flies Question Describe how the boys have fun as explorers. (p. 25-26) Who becomes the chief and how is this determined?
*October 25, 2011*

**English **

Lord of the Flies Questions 3.)What does Piggy believe has happened back home in England? 4.What does Piggy want to do now that they're on the island? 7.What happened when the conch was blown? (p. 17)
*October 25, 2011*

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