Wednesday
September 17, 2014

Posts by Zack


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

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