Thursday

October 2, 2014

October 2, 2014

Total # Posts: 241

**Algebra 1**

x+9y=8 (1) x=3-9y (2) x (3-9y)+9=8 3x -9y +9y=8 3x = 8 x= 2.6 Is this correct?
*April 11, 2010*

**Physics**

A projectile is shot straight up from the earth's surface at a speed of 1.20×104 km/hr. How high does it go?
*April 6, 2010*

**math**

what would be a good window for the graph of f(x) = -x^5 + 5x^3 - 3x + 15 I think that -10< x<10: -10<y<25 would be good. Does this seem right?
*March 19, 2010*

**5th grade**

the sum of eighty-nine and a number
*March 2, 2010*

**space/astronomy**

that doesnt apply at 10AU.
*November 30, 2009*

**space/astronomy**

Rank the objects based on the strength of the gravitational force that would be felt by a spacecraft traveling at a distance of 10 AU from the center of each of the objects, from weakest to strongest. 1)red giant mass: 1Msun radius: 100Rsun 2)sun 3)white dwarf mass: 1msun ...
*November 30, 2009*

**Chemistry**

nvm, i did some reworking heres what my final answer endo-by exo-none exo-by exo-on exo-on can someone confirm please?
*November 22, 2009*

**Chemistry**

Okay, so basically i think i got all the endo and exo figured out because of either state change (heat released or used) but how do i figure out the "on", "by" or 'none' part? 1) exo 2)exo 3)endo 4)exo 5)exo
*November 22, 2009*

**pre-algebra**

19
*November 19, 2009*

**physical science**

What is the change in thermal energy of water in a pond with a mass of 1,000kg and a specific heat of 4,184j(kgdegreesc) if the water cools by 1 degree c
*October 27, 2009*

**physical science**

Please help.How can the IMA of a screwdriver be increased?
*October 20, 2009*

**science**

What does in science the 'cross' mean in the warning sounds?
*September 19, 2009*

**Physics Problem**

A runner hopes to complete the 10,000m run in less than 30 minutes. After exactly 27 minutes, there are still 1100m to go. The runner must then accelerate at 0.20 m/s^2 for how many seconds in order to achieve the desired time? I get 80.9 but I know that the answer is 3.1 ...
*August 30, 2009*

**Math 117**

1.) A rectangular solid and a circular cylinder have the same volume and the same height. The base of the rectangular solid is a square. Which (if any) of the following statements are true? (i) The rectangular solid and the cylinder have the same base area. (ii) The ...
*August 20, 2009*

**Algebra**

Could someone work this out for me? Someone says the answer is 2.34 x 10^-6 but I think it's 2.34 x 10^-4. 2 x 10^-3 = 3 x 10^8 x 1/6 x pi x d Solving for d. Sorry it's kinda messy.
*August 12, 2009*

**Physics**

How would one determine the percent uncertainty in theta and in sin of theta for the following: 1) theta = 15.0 degrees +/- 0.5 degrees 2) theta = 75.0 degrees +/- 0.5 degrees I'm not sure whether I divide or use some kind of formula.
*August 11, 2009*

**Physics**

So, would that make it 8.76*10^-2? If so, what would the units be?
*August 10, 2009*

**Physics**

An average family of four uses roughly 1200 liters (300 gallons) of water per day. (One liter = 1000 cm^3.) How much depth would a lake lose per year if it uniformly covered an area of 50 square kilometers and supplied a local town with a population of 40,000 people? Consider ...
*August 10, 2009*

**Physics**

GPS can be used to determine positions with great accuracy. The system works by determining the distance between the observer and each of the several satellites orbiting Earth. If one of the satellites is at a distance of 20,000 km from you, what percent accuracy in the ...
*August 10, 2009*

**Spanish**

A donde vas a comer cuando tienes hambre
*April 6, 2009*

**8th grade**

What is the name of the large island that is part of New York?
*March 23, 2009*

**Chemistry**

What is the energy of an electron in the 2s orbital of a hydrogen atom?
*February 9, 2009*

**6th grade**

I need to come up with some math questions about the solar system.
*October 28, 2008*

**geometry**

Thank you very much. I could explain it (I thought) but couldn't express it in math terms. Thanks again
*October 8, 2008*

**geometry**

We are learning about proofs. We drew lines between noncollinear points. Our table showed 2 points >> 1 line segment, 3 point >> 3 line segments, 4 points >> 6 line segments, 5 points >> 10 line seg, 6 points >> 15 line seg. etc. Write an ...
*October 8, 2008*

**3rd grade**

3rd graders = x 4th graders = x 5th graders = x + 6 (this is because there are 6 MORE 5th graders than 3rd grade) Make an equation x + x + (x + 6)= 33 group like terms 3x + 6 = 33 subtract 6 from both sides to get x alone 3x = 27 divide both sides by 3 x = 9 PLUG IN 9 for x ...
*October 8, 2008*

**economics**

where do stocks go after being sold
*September 15, 2008*

**personal finance**

where do stocks go after being sold
*September 15, 2008*

**math**

coleen hid a coin equal rto fraction of a dollar behine her back. She said the freaction is smaller than 1/2 and greater than 1/20. What two possible coin could she have hidden. How do you know? Then said it was 5 time greater 1/20. what coin did she have.
*May 15, 2008*

**MATH**

THERE ARE 7 GIRLS ON A BUS EACH GIRL HAS 7 BACKPACKS IN EACH BACKPACK, THERE ARE 7 BIG CATS FOR EVERY BIG CAT THERE ARE 7 LITTLE CATS ? HOW MANY LEGS ARE THERE IN THE BUS?
*December 13, 2007*

**history**

in what direction do you travel to britan fom the us?
*November 30, 2007*

**spelling**

not a smile, but a
*October 29, 2007*

**science**

what would happen if your stomach stopped producing bile?
*August 10, 2007*

**PHYSICS**

A cylinder with a moveable piston holds 2.40 mol of argon at a constant temperature of 295 K. As the gas is compressed isothermally, its pressure increases from 101 kPa to 141 kPa. What is the final volume of the gas? I don't know where to begin. I tried using Pv=nRT: [(2....
*June 21, 2007*

**life science**

ok i really need help. like really bad. cant figure it out. ok here it is. a color blind man marries a woman with normal vision. of their three daughters, one is color blind. one of their two sons is also colorblind. what are the genotypes of the parents? please help me its ...
*May 17, 2007*

**Math**

Which is less 2t or 2,600 pounds 2 tons is 4000 lbs. 2 tonnes (t) are equal to 2000 kg, which is considerably more than than 2600 pounds. help i need hw help badd!
*April 24, 2007*

**science**

members of one species in a area are called http://en.wikipedia.org/wiki/Deme_(biology)
*March 21, 2007*

**Science**

I'm having trouble figuring out what the independent and dependent variables are in the following experiment: 1.
*March 19, 2007*

**math**

24+45=? 69 69 duh idiot
*November 19, 2006*

**Low recovery**

Ha I'm doing the same problem right now. I'm pretty sure its because the biphenyl will dissolve completely in the benzene at room temperature (not good for crystallizations).
*September 26, 2006*

**Analogies (just one)-- please help**

habit:break::job:quit
*September 14, 2006*