Wednesday

February 10, 2016
Total # Posts: 1,518

**maths**

Need help to know what to do: solve the equation 9/(x=7)=4/(x-3) My book tells me to cross multiply, then move all the terms in x and the terms without x on separate sides of the equation. then divide by the coefficient of x. How do i do this? I don't understnd it what ...
*March 8, 2011*

**geometry**

Julian is interested in building a new house. Three architects have given him plans. The first plan is for a house that will be 2,250 square feet. The total cost of the house will be $281,250. The second plan is for a house that will be 2,400 square feet. The total cost of the...
*March 7, 2011*

**chemistry**

Determine how many milliliters of 0.102M NaOH solution is needed to neutralize 35.0mL of 0.125M H2 SO4 solution.
*March 1, 2011*

**science**

what is the human life cycle
*March 1, 2011*

**physics**

Calculate the gravitational force between the Sun and Neptune. The mass of the Sun is 1.99×1030 kg. The mass of Neptune is 1020×1023 kg. The distance between them is 450×1010 m.
*February 26, 2011*

**physics**

I am confused because the answer should be in mi/s.
*February 26, 2011*

**Physics**

A rod with cross-sectional area A and length L is made from a material with a Young's modulus of Y. This rod could be considered an extremely stiff spring with some spring constant k. Find an expression for k in terms of the other quantities.
*February 25, 2011*

**Ethics**

thanks
*February 22, 2011*

**Ethics**

What moral is the fondness of war related to? I'm trying to sum it up in a concise phrase or word but I can't think of the right one. Ambitiousness? Belligerent? Thanks
*February 22, 2011*

**precalculus**

oops! i mean HYPERBOLA FORM
*February 21, 2011*

**precalculus**

Hi does anyone know how to solve this equation into parabola form? thanks x^2 + 2xy +3y^2 = 9
*February 21, 2011*

**math**

He had a lot on his mind
*February 17, 2011*

**math**

how tow write two word phrases for t/30
*February 16, 2011*

**Chemistry**

Thank you, I estimated the surface tension to be around 72.4 dynes/cm.
*February 15, 2011*

**Chemistry**

What is the surface tension of water at 23 degrees Celsius?
*February 15, 2011*

**Chemistry**

How much of a 500 ml bottle of 1.00 molar KCI solution should be diluted with deionized water to give 200.0 ml of a 0.100 molar solution
*February 14, 2011*

**child development**

b
*February 14, 2011*

**world history**

a b a b c d a c d d c a a b c b b c a c
*February 14, 2011*

**Geometry**

Thank you!
*February 4, 2011*

**Geometry**

If U is between T and B, find the value of x and the measure of TU. TU=4x-1, UB=2x-1, TB=5x Please help!
*February 4, 2011*

**social studies**

Where was indiana's first battle in the civil war
*February 3, 2011*

**Physics**

Does anyone know how to find the electric force of two objects if I have the distance and mass of the one of the objects? Thanks.
*February 3, 2011*

**Chemistry--Quick Question**

Sorry correction! I forgot to include one word I meant scientific knowledge The first step in acquiring scientific knowledge is often the observation or measurement of some aspect of nature. a. True b. False
*February 2, 2011*

**Chemistry--Quick Question**

The first step in acquiring knowledge is often the observation or measurement of some aspect of nature. a. True b. False
*February 2, 2011*

**math**

das
*January 31, 2011*

**algebra**

6n+8=50 answer using the balancing method
*January 30, 2011*

**Math**

This questions is like a word problem for a triangle. Draw point A and head 2 unit down draw point B there, then draw a point 3 units to the right. draw point C there it should be a right triangle with C-A as the hypotenuse. So distance C-A equals the square root of 2^2 + 3^2 ...
*January 25, 2011*

**math**

hi does anyone know what (h+t)^6 is? Thanks
*January 25, 2011*

**math**

hi does anyone know what (h+t)^6 is? Thanks
*January 25, 2011*

**statistics**

The size of a car \\\\\9small,med, and lar) are measured on a)ratio b) interval c) ordinal D nominal scale. Why
*January 20, 2011*

**12 th English**

I need to write a Parody on TV media analysis. Where do I begin?
*January 19, 2011*

**Chemistry--Quick Question**

I have the same question for class! correct answers are a,c,d?
*January 18, 2011*

**chemistry**

If 8.00 kJ of heat are added to 200. g of water at 20.0 C, what is the final temperature of the water?
*January 17, 2011*

**Math**

If a right triangle has legs of 9in. and 12in. What is the length of the hypotenuse?
*January 12, 2011*

**calculus ap**

If g is a differentiable function such that g(x) is less than 0 for all real numbers x and if f'(x)=(x2-4)g(x), which of the following is true?
*January 2, 2011*

**math **

what is 7-2i in trig form? and if u=3j and v=7i+j what is the dot product of u times v dont get this one because there are no i terms for u thanks
*December 30, 2010*

**world history**

what three types of land are best suited for agriculture
*December 19, 2010*

**algebra**

the length of the top of a table is 6 m greater than the width. the area is 91m^2. Find the dimensions of the table.
*December 19, 2010*

**physics**

Two boxes are seen to accelerate at the same rate when a force F is applied to the first and 5 F is applied the second. What is the mass ratio of the first box to the second?
*December 15, 2010*

**physics**

A 1.5 kg otter starts from rest at the top of a muddy incline 87.1 cm long and slides down to the bottom in 0.60 s. What net external force acts on the otter along the incline?
*December 15, 2010*

**Physics**

An airplane of mass 1.3 104 kg is moving at 64 m/s. The pilot then revs up the engine so that the forward thrust by the air around the propeller becomes 7.2 104 N. If the force exerted by air resistance on the body of the airplane has a magnitude of 4.0 104 N, find the speed ...
*December 13, 2010*

**fin**

3. Suppose an individual's MRS (of steak for beer) is 2s/b and this person is currently consuming equal amounts of steak and beer. Suppose also that the price of a steak is $1 and a beer is $4. Then what should the individual do in order to increase utility? Explain in 3-5...
*December 10, 2010*

**fin**

4. If an individual's utility function for coffee (x) and cream (y) is given by U(x, y) = min (x, 5y), write the demand function for coffee .
*December 10, 2010*

**macroeconomic theory**

7. Assume x and y are the only two goods a person consumes. If after a rise in pX the quantity demanded of y increases. Evaluate the following as true or false and explain. Support your explanation with a graph. The income effect dominates the substitution effect for good y...
*December 10, 2010*

**macroeconomic theory**

4. If an individual's utility function for coffee (x) and cream (y) is given by U(x, y) = min (x, 5y), write the demand function for coffee .
*December 10, 2010*

**math**

sin^-1 (12/7 sin42\[Degree]) b = sin -1 (12/7 sin 42 degrees) How do I do this?
*December 8, 2010*

**Trig**

How do I do this? I punch the numbers into my calculator, and they don't work. B=sin^-1 (12/7 sin42\[Degree])
*December 8, 2010*

**MATH**

solve (x-3)(x+3)<0. xsquared-3x+3x-9 x squared=9 x=3
*December 8, 2010*

**algebra**

1/2x
*December 8, 2010*

**pre-algebra**

3x + 2x=5-6+6 5x=5 x=1
*December 8, 2010*

**Math**

a. 10% out of 100% failed A or 10/100 3% of 100% failed A & B or 3/100 3% that failed A(10%) also failed B or 3/10 b. 12% out of 100% failed B 3% out of 100% failed A & B or 3/12 c. failed A - 10% failed B - 12% sub total 22%(-3% counted double-failed both) = 19% total d. 100...
*December 8, 2010*

**college chemistry**

not sure I guess i put it down that way because im in college taking it.
*December 8, 2010*

**college chemistry**

At a prominent state hospital, a 45-year-old woman is receiving a ‘combined modality' treatment for the initial stage of breast cancer. State the two aspects included in this treatment. State the methods by which a radiation oncologist can administer these therapies. ...
*December 8, 2010*

**college chemistry**

Discuss in detail, one way in which atomic nuclear decay takes place. What is the significance of atomic nuclear decay? Analyze the societal implications of using this process.
*December 8, 2010*

**Calculus**

assume the rate at which the world's oil is being consumed is r = 27 e^0.06 t. Here, just as in your book, r is in billions of barrels per year, t is in years, and t = 0 is January 1, 1990. (a) Fill in the blanks below to express the definite integral which measures the ...
*December 6, 2010*

**Calculus**

∫4 [( ( ln(z) )^ 2)/z] dz ∫[( 7 e^(7 √x))/ √x] dx ∫[(2 x + 5)/( x^2 + 5 x + 2)] dx
*December 5, 2010*

**physics**

A pilot wants to fly west (ie., the resultant is west). If the plane has an airspeed of 9.5 m/s, and there is a 25m/s wind blowing north, in what direction must she head the plane?
*December 3, 2010*

**arithmetic**

a recipe for rice pudding uses 1/2 cup of rice and serves 6 people. write the cups of rice per person as a unit rate . how many cups of rice do you need to serve 75 people?
*November 29, 2010*

**Chemistry**

The following isotopes (listed with their half-lives) have been used in the medical and biological sciences. Arrange these isotopes greatest to least decay activity. (Use the appropriate <, =, or > symbol to separate substances in the list.) ^3H (12.2 years) ^24Na (15 ...
*November 27, 2010*

**Chemistry**

How did you get N?
*November 27, 2010*

**Chemistry**

Each of the following nuclides is known to undergo radioactive decay by production of a beta particle, ^0_-1e. Write a balanced nuclear equation for each process. (Use 'e' for an electron, 'p' for a positron, and 'n' for a neutron. Omit states-of-matter...
*November 27, 2010*

**physics**

A 50.0 kg girl bounces up and down on a pogo stick. The girl has an instantaneous acceleration of 2.0 m/s^2 when the displacement is -8.0cm. What is the spring constant of the pogo sticks spring?
*November 24, 2010*

**physics**

Find the length of a pendulum that has a frequency of 0.80 Hz?
*November 24, 2010*

**physics**

A 0.025 kg object vibrates in SHM at the end of a spring. If the maximum displacement of the object is 0.030 cm, and its period is 0.50s, what is the maximum acceleration of the object?
*November 24, 2010*

**physics**

A 0.11kg mass is vibrating at the end of a horizontal spring along a frictionless surface. If the spring constant is 0.52 N/m, what is the displacement of the mass when the acceleration of the mass is 0.25m/s^2?
*November 24, 2010*

**physics**

A man is pulling on a rope with a force of 53 N directed at an angle of 70◦ to the horizontal. What is the x-component of this force? Answer in units of N.
*November 22, 2010*

**algebra**

Convert to a logarithmic equation: 9y = 6561
*November 21, 2010*

**CHEMISTRY**

For the reaction 3 O2(g) reverse reaction arrow 2 O3(g) If the equilibrium mixture is analyzed and [O2(g)] is found to be 3.77*10-2 M, what is the concentration of O3(g) in the mixture?
*November 21, 2010*

**Chemistry**

How to find the coefficient of Fe^2+ from ClO3^- + Fe^2+ --> Cl^- + Fe^3+
*November 21, 2010*

**Chemistry**

Which has the higher [H+], 0.40 M RbOH or 0.20 M Ca(OH)2?
*November 20, 2010*

**Statistics/Math- Please Help**

When comparing two independent population means, how do I find the degree of freedoms?
*November 15, 2010*

**Statistics**

When comparing two independent population means, how do I find the degree of freedoms?
*November 15, 2010*

**physics**

what is L?
*November 15, 2010*

**Calculus**

The velocity of a car (in miles per hour) is given by v(t) = 61.25t − 17.5 t^2 where t is in hours. Write a definite integral for the distance the car travels during the first 2.5 hours. Use your graphing calculator to find this distance. Distance =
*November 14, 2010*

**physics**

A 1500-kg car is making a turn with a 100.0-m radius on a road where the coefficient of static friction is 0.70. What is the maximum speed the car can go without skidding?
*November 7, 2010*

**physics**

A propeller blade has a period of rotation of 0.400s. What is the speed of the outer tip of the propeller blade if the tip is 1.20m from the hub?
*November 7, 2010*

**physics**

i apply an 800 N force to the crate a. how long would it take the crate to travel 20m across the warehouse floor(in the direction that i am pushing it)? b. what is the magnitude and direction of the force of friction acting on the crate?
*November 5, 2010*

**chemistry**

in an element on the periodic table, which number tells you the how many electrons are in that element??
*November 4, 2010*

**Physics**

Forces of 10.6 N north, 20.8 N east, and 14.3 N south are simultaneously applied to a 3.76 kg mass as it rests on an air table. What is the magnitude of its acceleration?
*November 1, 2010*

**Physics**

Forces of 10.6 N north, 20.8 N east, and 14.3 N south are simultaneously applied to a 3.76 kg mass as it rests on an air table. What is the magnitude of its acceleration?
*November 1, 2010*

**Physics**

Forces of 10.6 N north, 20.8 N east, and 14.3 N south are simultaneously applied to a 3.76 kg mass as it rests on an air table. What is the magnitude of its acceleration?
*November 1, 2010*

**Physics**

An object is released from rest. How far does it fall during the third second of its fall?
*October 26, 2010*

**chemistry**

yes, ive asked multiple people and they've all told me the same thing. i'll study the question the way you said, i have a test next week and i wanted to know how to solve problems like this,
*October 26, 2010*

**chemistry**

i already posted this question, but im still confused on it. Dinitrogentetraoxide partially decomposes according to the following equilibrium: N2O4 (g) -> 2NO2 (g) <- A 1.00-L flask is charged with 0.400 mol of N2O4. At equilibrium at 373 K, 0.0055 mol ofN2O4 remains. ...
*October 26, 2010*

**Chemistry Class**

I got the problem from my book, and it says the answer is 0.87?
*October 25, 2010*

**Chemistry Class**

Dinitrogentetraoxide partially decomposes according to the following equilibrium: N2O4 (g) -> 2NO2 (g) <- A 1.00-L flask is charged with 0.400 mol of N2O4. At equilibrium at 373 K, 0.0055 mol ofN2O4 remains. Keq for this reaction is ?. hOw can i set up this problem?
*October 25, 2010*

**5th grade**

*MAXIMUM 18 SO IT IS THE LAST # IN THE SET. *12 IS THE MEDIAN SO IT HAS TO BE THE MIDDLE #. IN A STRING OF 12 NUMBER, 12 WOULD HAVE TO BE THE 6 AND 7 # TO BE IN THE MIDDLE. *FOR 7 TO BE THE MODE, IT HAS TO BE A # USED MORE THAN ANY OTHER. *RANGE IS 13 WITH THE MAXIMUM 18, ...
*October 25, 2010*

**algebra**

How do I figure (17 + a)^ = 2209 I know a = 30, but how do I get the answer?
*October 22, 2010*

**physics**

why does the filament of a bulb does not melt though it heats more than 3400 degree celcius
*October 22, 2010*

**physics**

A loaded dogsled has a mass of 400kg and is being pulled across a horizontal, paced snow surface at a velocity of 4.0m/s (N). Suddenly, the harness separates from the sled. If the coefficient of kinetic friction for the sled on the snow is 0.0500, how far will the sled coast ...
*October 22, 2010*

**physics**

a ball rolls off an incline at an angle of 30 below the horizontal at a velocity of 22m/s. how far from the base will the ball hit the floor if it lands in 3s?
*October 14, 2010*

**sentence writing**

hmm
*October 14, 2010*

**psychology**

Advertisers have been using the principles of classical conditioning for years in attempts to associate pleasant feelings with their products. One particular genre of ads (for beer) is particularly famous for doing so by placing scantily clothed women holding beer bottles on ...
*October 13, 2010*

**college organic chemistry**

Give the product of the substitution reactions. (CH3)2CHOSO3CH3 -> ?
*October 13, 2010*

**chemistry**

how many C atoms are in 1.50 moles of lactic acid?
*October 10, 2010*

**chemistry**

how many grams of NaOH do you need to prepare a 3.00 x 10^2 mL stock solution of 2.00 M NaOH
*October 7, 2010*

**Physics**

Free Fall: Tara throws a baseball down to Nathan. If she throws it with a speed of 2.0m/s and it lands in Nathan's hand with a speed of 10.0m/s, how far above Nathan is Tara?
*October 5, 2010*

**Physics**

Thank You.
*September 30, 2010*

**Physics**

Oh I see. What does that have to do with Galileo? I know about his objects with different masses don't determine which will fall first. Is there another concept?
*September 30, 2010*

**Physics**

It's moving 2 meters every second.
*September 30, 2010*