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Posts by anonymous

Total # Posts: 108,938

Mayh
Martin used m Omar used .5m-5 total = m + .5 m - 5 = 1.5 m-5

chemistry
thank you so much you are a great help have a nice day. you are an amazing and smart person!

chemistry
P V = n R T V, T and R are the same for each so n, the number of mols is proportional to P total pressure = 3.5 + 2.8 + .25 + .15 = 6.7 so for example mol fraction of N2 = 3.5/6.7 = .522

chemistry
Four gases were combined in a gas cylinder with these partial pressures: 3.5 atm N2, 2.8 atm O2, 0.25 atm Ar, and 0.15 atm He.What is the mole fraction of N2 in the mixture?

maths
total length = 15+3 = 18 total width = 9+3 = 12 so path area = 12*18 - 9*15

Physics
v = -9.81 (3.6) d = (1/2)g t^2 = 4.9(3.6)^2

Physics
v = Vi - 9.81 t at top v = 0 0 = 49 - 9.81 t t = 49/9.81 h = 49 t - 4.9 t^2

Vocabulary
Are you doing online school or is it just the one site you do at school cause i am doing online school and it sucks my teachers make a lot of errors. but i get to have an early summer cause i finish all my work at a faster pace. woot woot summmmmmmmer a month early you should ...

biology
if you have 1.0*10^9 molecule in tube and perform a 10^-7 dilution, how many molecule will in the new tube?

biology
if you want to make 50 ml of a 1x TAE solution fro a 50X stock, how would you prepare it?

Science
How are the primary pigments related to the primary colors? The primary pigments are: A. Complementary to the primary colors B. Associated with the primary colors C. Unrelated to the primary colors

Algebra
12%=0.12 then you multiply $1599.99 by 0.12 and you get 191.9988 then you round and get $192 hope this is correct its been a couple years since alg.

Algebra
Jameston High School has 2020 students. Its enrollment has been decreasing at a rate of 125 students per year. Townsville High School has 1075 students. Its enrollment has been increasing at a rate of 80 students per year. Assuming the enrollment rates continue: A. Write an ...

math
Of the following fractions: 9/19, 5/11, 7/15, and 11/23, which is the largest?

Calculus
What is y=-2/7x-1 in standard form?

Calculus
What is y=-18x+13 in standard form?

Math
A bicycle that usually sells for $230 is on sale for 15% off. Find the sale price. Is this correct 230/25=9.2 230-9.2=220.8

history
voters cannot sign multiple petitions.

Statistics
Researchers recruited 20 volunteers- 8 men and 12 men omen- to take part in an experiment

Math/velocity
just kidding, I figured it out! It's -4, 0, and 4

Math/velocity
At time t seconds, the center of a bobbing cork is y=4sint centimeters above (or below) water level. What is the velocity of the cork at t = 0, ?/2, ?

Math derivatives
Let f(2)=3, g(2)=4, f'(2)=5, g'(2)=6, f'(3)=7, g'(3)=8, etc. find (f?g)?(2)

Math
A line segment has one endpoint of (-3,2) and an undefined slope. Find the coordinates of another possible endpoint.

world
The shares of a company

Math
A line segment has one endpoint of A (2, -1) and a slope of 3/4. Find the coordinates of another possible endpoint B.

Algebra 1
Oh sorry about that, the slope is 2/3 and also thanks for the help.

Algebra 1
1. yes 4/3 2. slope = -2 all right 3. You did not say what the slope is but the only choice with y intercept of 9 is C. The y axis intercept is the value of y when x=0

Algebra 1
1. Find the slope of a line that passes through (–2, –3), and (1, 1). A. 1/3 B. 1 C. 2 D. 4/3** 2. For the equation –4y = 8x, what is the constant of variation? A. -4 B. -2** C. 1 D. 2 3. What is an equation for the line with slope and y-intercept 9? A. y = 2/3x...

Algebra 1
Thanks for the help

Algebra 1
1. yes, y = 3 x so y = 30 when x = 10 2. slope = m = (1+3)/(3-1) = 2 so y = 2 x + b put a point in 1 = 2*3 + b b = -5 so y = 2 x - 5 agree

Algebra 1
1. Suppose y varies directly with x, and y = 24 when x = 8. What is the value of y when x = 10? A. 10 B. 30** C. 80 D. 240 2. What is an equation in slope-intercept form for the line that passes through the points (1, –3) and (3, 1)? A. y = 3x + 1 B. y = x – 3 C. y...

Science
potential energy + kinetic energy = constant at top, Pe = m g H and Ke = 0 on the way down (1/2) m v^2 + m g h = that original m g H

math
2(b+3b)=40 b = 5 so 5 and 15

Math
30*60 = 1800 seconds * 4 m/s = 4*1800 meters 2 pi r = 200 pi meters circumference 4 *1800/200 pi = 36/pi= 11.459 circles = 11 circles + .459 circle .459 * 360 = 165 degrees x = 100 cos 165 = -96.6 y = 100 sin 165 = +25.9

Social studies
Rilley is right for connects students thank you

language arts: plz help
How mature Ms. Sue deleting my comment!!!! Such An Adult!!!!

Math
A recipe that makes eight servings calls for 2 cups of milk how many cups of milk will be needed for 36 servings

Maths
xz

physics
work = pulling force in direction of motion * distance like period, the friction and all are irrelevant. work = 161 cos 35 * 13.5 If there are more parts like how fast does it go or something, the rest matters, but that is all you need to know for the question you asked.

physics
mass does not matter, call it m normal force = m g cos 44 max friction force up slope = .27 m g cos 44 gravity force down slope = m g sin 44 so m g sin 44 - .27 m g cos 44 = m a (sin 44 - .27 cos 44) 9.81 = a

Hala -- Physics
Hala - acceleration = total change in velocity/time, not average a = 10 /2 = 5 m/s^2 what is in your mind I think is total distance = average speed *time

Social studies
ITS BUCKING D YEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

Math
2 x + 5 x = 63 7 x = 63 x = 9 2x = 18 5x = 45 ================== add to check 18 + 45 = 63, whew !

Differential equation, calculus
dt/dr = k/r^2 dt = k dr/r^2 try t = k (-1/r) + c I do not know where you got the other.

physics
Ac = 1.5 g = approximately 15 m/s^2 Ac = omega^2 r so omega^2 = 15/8 omega = 1.37 radiaans/second 2 pi radian /rev so .218 revs/sec times 60 s/min = 13 revs/min

no idea
Need better description of how boxes interact. (one on top of other? one hanging vertically from pulley? whatever)

physics
moving at 2.5 m/s relative to ground t = 35 m/2.5 m/s moving at (v-1) m/s same t 35 = (v-1) t solve for v

math
480000(.15)(.5)= 36,000

Physics
k = m g/.15 omega = 2 pi/T = sqrt (k/m) 2 pi/T = sqrt (9.81/.15)

History
OMG THANKS, PEN ISLAND!!!!!!! YOU'RE A LIFE SAVER!

Math
A wire is stretched from the top of a two feet tall anchor to the top of a 45 foot tall antena. If the wire is straight and has a slope of 3/5, then what is the length of the wire in feet?

Statistics
jkl;;

Algebra
there are three nickels three dimes and four quarters in your pocket. you randomly pick three coin and place them on the counter. the first two coin are a dimes, and the third is quarter Probatitly of what happening?

English
I know that when we are writing essays, we cannot use the words we, you, etc. Is it okay if we use the words they, them, their?

English
what is passive voice

math
20 men dig a trench in 12 days,how many men would be needed to do it in 10 days

math
You are welcome.

math
15 y > -99/13 note < to > when multiply by negative 9 y > -99/(15*13)

algebra
A car cost $25,750.00 and depreciates in 20% per year how much will the car be worth in 5 years

Algebra 1
a^n /a^m = a^(n-m)

Algebra 1
say (2 *10^5) / (1*10^3) that is (2/1) (10^5/10^3) = 2 * 10^(5-3) <<<---important = 2 * 10^2 ================ check 2* 100000 /1000 = 2 * 100 :)

Algebra 1
What was the answer?

Algebra 1
(9*10*2)^3 = 9^3 *10^6 so (4/3) pi 9^3 * 10^6 about 4 * 81*9 * 10^6 about 2.9*10^9 the top one

Math
r = .05/4 = .0125 every quarter year multiply by 1.0125 7 years = 28 quarter years so 16,000 * 1.0125^28 = $ 22,655.88

chem
22.5 grams of lithium reacts with 33.5 grams of aqueous aluminum sulfate

Algebra Word Problem
n (n+2) (n+4) n(n+4) = 9 +12(n+2) n^2 + 4 n = 9 + 12 n + 24 n^2 - 8 n - 33 = 0 (n-11)(n+3) = 0 n = 11 n+2 = 13 n+4 = 15

math (precalc)
(x-5)(x-5)(x-3+4i)(x-3-4i) = 0 (x^2-10x+25)(x^2-6x+25) multiply that out

physics
I do not understand your second problem.

physics
average speed during stop = 25/2 = 12.5 m/s time to stop, t = 125/12.5 = 10 s v = Vi + a t 0 = 25 + a(10) a = -2.5 m/s^2 F = m a F = -2.5 m F = -mu m g F = -mu m (9.81) so mu(9.81)=2.5 mu = 2.5/9.81

physics1
What is the magnitude of your total displacement if you have traveled due west with a speed of 23 m/s for 125 s , then due south at 12 m/s for 255 s ? Express your answer using two significant figures. What is the direction of your total displacement in part A.

History
Who does Robespierre round up and execute

History
What was the name of the new freedom of the press newspaper created by Jean Paul Marat

History
When does the Terror end and who seizes control of france? July 27 1794 and Napolean

Physics
which of the following is NOT true about the path of a cannon ball launched horizontally from the earth's surface if air resistance is neglected? a. the cannnonball has a uniform horizontal velocity b.the total velocity of the cannon ball increases as a function of time c....

Physics
What happens to the location of the image when the radius of curvature changes? I think it moves farther away when the curvature increases.

math
x is distance between d is how close the close one is I assume they are on exactly the same bearing , not just the same side, or the problem is meaningless. People who write math books do not navigate. tan 42 = 48.8/d tan 35 = 48.8/(d+x) so d = 48.8/tan42 so d = 54.2 and 54.2...

math
tan 46 = h/400

Math
you must find the other side of rectangle using Pythagorean theorem where 5 is the hypotenuse and 3 is one of the legs. you will find out that the other leg is 3 cm. then find the area of the triangle 1/2bh using 4 as the height and 3 as the base.

mathmatics
A man has Rs 10000. he lost 2/5 of his money and he spent 1/4 of the reamainder. find the reamaining money with him now.

Science
density of wood that is 20 cm below water and 60 cm above water

psychology
Dr. Zimand is studying testosterone levels and their influence on aggression in adult males. It is likely that Dr. Zimand specializes in the ____________ approach to psychology.

Chemistry
Recall the reactions for this lab: S2O82- + 2I- ? 2SO42- + I2 (slow) Reaction 1 The one that delays the solution turning blue: I2 + 2S2O32- ? 2I- + S4O62- (fast) Reaction 2 b. All the S2O32 is consumed when the color change occurs. Therefore, ?[S2O32] = c. Use the ...

Chemistry
. A student mixed the following reactants, using the general procedure for the experiment: 10.0 mL of 0.10 M KI, 10.0 mL of 0.0010 M Na2S2O3, 20.0 mL of 0.040 M K2S2O8, and 10.0 mL of 0.10M HCl. It took about 75 seconds for the mixture to turn blue. a. By using the dilution ...

Math 104
There are 5 cyclists in a race. There will be a first-place and a second-place prize awarded. In how many different ways can the 2 prizes be awarded?

chem
0.210 mole of Na2CO3 in 200.0 mL of solution

physics
how is energy conserved ith a spring and box on a ramp. does 1/2kx^2 still equal gpe? what if the spring displacement is the same but the angle of the ramp changes, causing the gpe to change. how is energy conserved since the gpe is lower than before but the spring pe is the ...

Math
y=x-6 y=2x

addition vectors (physics)
east components (+ x axis) 75 cos 25 - 75 cos 65 north components (+ y axis) 75 sin 25 - 75 sin 65 - 75 so I get east = +36.3 km north = -111 km distance = sqrt(36.3^2 +111^2) tan angle south of east =111/36.3

Physics
You have typed this all wrong but look at the question above this one to see how to do it.

Algebra2
its a inverse variation

MATH
What is the percentage of sugar in the syrup made of 10 kg of water and 15 kg of sugar?

Algebra
uj

Algebra
150g of sugar was used to make a bottle of 8% syrup. How much water was used to make this bottle of syrup? How much syrup is there in this bottle?

Geo
(SAT Prep) The perimeter of pentagon ABCDE is 30 in, AB = 7 in, BC = CD = 6 in, DE = 5 in. How many sides of the pentagon have equal length?

Geometry
I need help too

Geo
(SAT Prep) The diagonals BF and CE divide the hexagon ABCDEF into two equilateral triangles and a square. Find the perimeter of the hexagon if BF = 3 cm.

Maths,
(2/5)s + (1/4)s = (8/20 +5/20)s = (13/20)s so (7/20)s = 2.10

Algebra I
3 c + 5 b = 31 c = 3 b - 1 ====================== 3 (3b-1) + 5 b = 31 9 b - 3 + 5 b = 31 14 b = 34

your turn
This is so similar to ones I have shown you how to do that you should be able to do it.

Physics
By the way, I am assuming that either way the man goes up into the container. If not then he has to move his own mass up, not only the wheelbarrow.

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