Tuesday
July 22, 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?

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?

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?

5th grade
the sum of eighty-nine and a number

space/astronomy
that doesnt apply at 10AU.

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 radi...

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?

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

pre-algebra
19

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

physical science
Please help.How can the IMA of a screwdriver be increased?

science
What does in science the 'cross' mean in the warning sounds?

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 seco...

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 rectangula...

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.

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.

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

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 ...

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 distan...

Spanish
A donde vas a comer cuando tienes hambre

8th grade
What is the name of the large island that is part of New York?

Chemistry
What is the energy of an electron in the 2s orbital of a hydrogen atom?

6th grade
I need to come up with some math questions about the solar system.

geometry
Thank you very much. I could explain it (I thought) but couldn't express it in math terms. Thanks again

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 expressi...

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 3r...

economics
where do stocks go after being sold

personal finance
where do stocks go after being sold

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.

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?

history
in what direction do you travel to britan fom the us?

spelling
not a smile, but a

science
what would happen if your stomach stopped producing bile?

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....

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 co...

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!

science
members of one species in a area are called http://en.wikipedia.org/wiki/Deme_(biology)

Science
I'm having trouble figuring out what the independent and dependent variables are in the following experiment: 1.

math
24+45=? 69 69 duh idiot

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).

Analogies (just one)-- please help
habit:break::job:quit

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