Thursday

March 26, 2015

March 26, 2015

Total # Posts: 2,792

**Alegbra**

Andrew measures the amount of a very unstable substance to be 100 moles. The half-life of this substance is 3 days (after 3 days, half is gone). Write an exponential function that models this situation where y is the amount of substance and x is time in days. Thank you for ...
*May 1, 2012*

**Math :(**

Thanks :)
*April 30, 2012*

**Math :(**

Gil rolls a number cube 78 times. How many times can he expect to roll an odd number greater than 1??
*April 30, 2012*

**math**

A baseball player reaches base 35% of the time. How many times can he expect to reach base in 850 at-bats?
*April 30, 2012*

**math**

Put 18/1 and then multiply 18/1 x 4/6= 72/6 and simplify to 12 :)
*April 30, 2012*

**Science**

C is correct :)
*April 30, 2012*

**math**

The side that connects all of the points is the base.
*April 30, 2012*

**Science**

Vanessa pushes a box with 50 N of force. The box accelerates 2 m/s2 for 10 seconds. What is the mass of the box?
*April 29, 2012*

**science**

write a skeleton equation for this reaction hydrogen iodide(g)->hydrogen+iodide(G)
*April 29, 2012*

**chemistry**

A scuba diver takes a 2.3L balloon from the surface, where the pressure is 1.0atm and the temperature is 37degrees C, to a depth of 35m, where the pressure is 4.5atm and the temperature is 18degrees C.what is the final volume at this depth?
*April 28, 2012*

**chemistry**

How many grams of hydrogen are collected in a reaction where 1.80L of hydrogen gas is collected over water at a temperature of 40degrees C and a total pressure of 738torr?
*April 28, 2012*

**Chemistry**

A heliox deep-sea diving mixture delivers an oxygen partial pressure of 0.20 atm when the total pressure is 13.0atm .What is the partial pressure of helium in this mixture?
*April 27, 2012*

**Physics **

A rock is thrown horizontally off of a cliff. It starts with a velocity of 4.2 m/s and the cliff is 68.2 m high. How far out from the bottom of the cliff does the rock fall? 57m 59m 63m 45.8m
*April 26, 2012*

**english**

What elements of the Restoration comedy are seen in The Importance of Being Earnest? (5 points)
*April 25, 2012*

**english**

The procession was temporarily abolished because of the emperor’s interest in _____ (1 point) A.wars. B.viands. C.bicycles. D.poisons.
*April 25, 2012*

**Pre-Algebra**

The grocery store sells kumquats for $4.25 a pound and Asian pears for $2 a pound. Write an equation in standard form for the weights of kumquats k and Asian pears p that a customer could buy with $12.
*April 25, 2012*

**Enviro Science**

#4: D because slippage makes a rumble and also creates a crack in the earth surface. :)
*April 24, 2012*

**english**

The procession was temporarily abolished because of the emperor’s interest in _____ (1 point)
*April 23, 2012*

**Trigonometry**

A ladder leaning against a building makes a 40 degree angle with the ground. The top of the ladder reaches 10 feet above the ground. How tall is the ladder to the nearest whole foot?
*April 23, 2012*

**geometry**

Hexagon A is a regular hexagon. The total length of all the sides of the hexagon is 24 inches. Hexagon A is dilated about its center to create Hexagon B. The length of each side of Hexagon B is inches. By what factor was Hexagon A dilated to create Hexagon B?
*April 22, 2012*

**Math**

Jnuary 1, 1990 was a Monday. What day of the week was february 1, 1990 ?
*April 21, 2012*

**Math**

Jan and Nika ride their bikes. Jan rides 5 miles per hour for 1 hour then rides at ten miles per hour for 30 minutes.Nika rides at a constant 8 miles per hour. the tripss cover the ssme distance. Forr hoew many minutes does Nika ride ?
*April 21, 2012*

**American Government**

Ms Sue can you still help me?
*April 17, 2012*

**American Government**

yeah that was good... thank you.. can you help me with number 2?
*April 17, 2012*

**American Government**

Thats the problem, I dont know how to do it.
*April 17, 2012*

**American Government**

1. Justice Stephen Breyer stated, “people need to understand the importance of the Court as an institution, even though the Court’s decisions may at times be unpopular and possibly wrong,” Explain how this statement relates to the concepts of “Judicial ...
*April 17, 2012*

**American Government**

I know I tried but I can't get it together...
*April 17, 2012*

**American Government**

Its supposed to be an essay, between 600 to 700 words, all together, But I can't find how to do it, I tried but american government its not a stong subject for me. Can you help?
*April 17, 2012*

**American Government**

Yes
*April 17, 2012*

**American Government**

1. Justice Stephen Breyer stated, “people need to understand the importance of the Court as an institution, even though the Court’s decisions may at times be unpopular and possibly wrong,” Explain how this statement relates to the concepts of “Judicial ...
*April 17, 2012*

**Math**

It is given that the straight line passing through (2,1)and perpendicular to L.
*April 12, 2012*

**Math **

the equation of striaght line is 2x-3y+8=0 find the equation of the straight line passing through (4,-2)and parallel to L
*April 12, 2012*

**physics**

What is the angular momentum (in kilogram-meter^2/second) of a 300.0 g ball rotating on the end of a string in a circle of radius 1.87 m at an angular speed of 1.50 rad/s? Is there certain equations to find angular momentum for different shapes?
*April 12, 2012*

**physics**

A 1350 kg car rolling on a horizontal surface has a speed of 40 km/hr when it strikes a horizontal coiled spring and is brought to rest in a distance of 5.5 m. What is the spring constant (in N/m) of the spring?
*April 12, 2012*

**physics**

thanks
*April 11, 2012*

**Chemistry**

To produce 3.00 L of a 1.9 M solution of NaOH, how many grams of NaOH must be dissolved?
*April 11, 2012*

**Math**

thank you that helped alot
*April 11, 2012*

**Math **

ok so the point are A(3,0) and B(-4,6) and the question asks : the images of points A and B after a reflection in the line y=x. what im trying to ask is what axis does it go over the y or x axis?
*April 11, 2012*

**Physics**

I used that equation to solve for the contributions from each wire. I accidently used the equation for magnetic field for a loop (instead of this wire equation) the first time I submitted the homework problem. The angle was incorrect the first time I submitted it too, but it ...
*April 10, 2012*

**Physics**

The figure below shows two current carrying wires and the directions of the currents they carry. The wires carry the following currents: I1 = 7.1 A and I2 = 8.9 A. Wire 1 is at (0, 5.8) mm; wire 2 is at (15.1, 0) mm; point P is at (15.1, 5.8) mm. Wire 1 is pointing into the ...
*April 10, 2012*

**Math (Algebra)**

I am having a bit of trouble with the question stated below. I am home-schooled and learning math on your own has proven to be quite the difficult task. If someone could please explain how to do this as thoroughly as possible, I would greatly appreciate it. I honestly have no ...
*April 10, 2012*

**Chemisty Help**

for each of the molecules below, show the dipole you would expect. you must show the direction of the dipole - arrow head pointing toward the negative end. 1) CF4 2) CH3Cl
*April 9, 2012*

**Chemistry**

Addition of which of the following substances will increase the solubility of CuCO3 (s) in water ? CuCO3 ---- Cu^2+ (aq) +2 CO3^2- (aq) 1. Aqueous hydrochloric acid 2. Aqueous sodium carbonate 3. Solid copper (II) carbonate a) 1 only b) 2 only c) 3 only d) 1 and 3 only e) 1,2 ...
*April 4, 2012*

**MathLog#4**

But Steve, you used the equation 2x^n-1 rather than 2x^n+1, does that make a difference??
*April 4, 2012*

**MathLog#4**

Thank you guys so so so so much! I have been looking at this forever trying to see how to solve it, when it was right in front of me!! :D
*April 4, 2012*

**MathLog#4**

Simplify: ((2x^n)^2 - 1)/(2x^n-1) where x is an integer and n is a positive interger. for this one igot the answer the same as 2n^x+1, but will the value of the given expression be even, odd, or either? Please explain. :) Thank Yoo
*April 4, 2012*

**MathLog#4**

is the product of two linear functions always a quadratic function? Explain..
*April 4, 2012*

**algebra**

the binomial 8y^12+z^6 can be factored into a binomial and a trinomial. the binomial factor is (2y^4+z^2). whats the trinomial?
*April 3, 2012*

**Physical Science**

Distinguish between longitudinal and transverse waves. Do all waves fall into one or the other of these categories? If not, give an example of one that does not?
*April 2, 2012*

**MathLog#4**

Simplify: ((2x^n)^2 - 1)/(2x^n-1) where x is an integer and n is a positive interger.
*April 2, 2012*

**Science**

michelle weighs 900 N. How much pressure does she apply when she stands on her head, if the part of her head touching the floor has a radius of 2cm?
*April 1, 2012*

**AP English**

can someone please tell me what Luisa Santiago has to do with the role of women in a Chronicle of a Death Foretold by Gabriel Garcia Marquez?
*March 28, 2012*

**poetry, please comment**

I like the theme but your rhyme scheme is throwing me off. Why don't you try rhyming the last two words of each stanza instead. Just because it's a poem doesn't mean it has to rhyme. Hope this helps :)
*March 28, 2012*

**math**

sorry i meant simplify instead of simply
*March 28, 2012*

**math**

It's like miles per hour except in this case it's miles per minute Miles/minute Then just simply :)
*March 28, 2012*

**math**

60%
*March 23, 2012*

**algebra**

how would u factor 2x^2 +13x-7 =27? please help
*March 21, 2012*

**Chemistry**

Consider the equation: A + 4B=3C+3D, when equal masses of A and B are reacted, which is limiting? My possible answers are: A)if the molar mass of A is less than the molar mass of B, then B must be limiting. B) If the molar mass of A is greater than the molar mass of B, then A ...
*March 21, 2012*

**Chemistry**

Consider the reaction of magnesium metal with hydochloric acid to produce magnesium chloride and hydrogen gas. If 3.85 mol Mg and 3.85 mol of HCl are reacted, how many mol of oxygen are left over? I balanced the equation and got Mg(OH)2+2HCl=MgCl2+2H2O. Can you please walk me ...
*March 20, 2012*

**psychology**

Is community treatment for schizophrenia effective? Think about what constitutes “community” and is it the same everywhere? Explain.
*March 20, 2012*

**Calculus**

2. An object is moving along the parabola y = 3x^2. a) When it passes through the point (2, 12), its “horizontal” velocity is dx/dt= 3. What dt is its “vertical” velocity at that instant? b)If it travels in such away that dx/dt=3 for all t,then what happens...
*March 18, 2012*

**chemistry**

which of the following chemical substances would you expect to exhibit the greatest degree of hydrogen bonding? A. ethanol B.propanol C. methanol D. butanol
*March 16, 2012*

**Pre-Calc**

The Greek mathematician Eratosthenes (ca. 276-195 B.C.) measured the circumference of the earth from the following observations. He noticed that on a certain day the sun shone directly down a deep well in Syene (modern Aswan). At the same time in Alexandria, 500 miles north (...
*March 16, 2012*

**accounting**

The predetermined overhead rate for manufacturing overhead for 2008 is $4.00 per direct labor hour. Employees are expected to earn $5.00 per hour and the company is planning on paying its employees $100,000 during the year. However, only 75% of the employees are classified as...
*March 16, 2012*

**Chemistry**

7.93 mol
*March 16, 2012*

**Chemistry**

Refer to the following equation: 4NH3 + 7O2= 4NO2 +6HO, How many moles of ammonia would be required to produce 11.9 mol of water? Can you please walk me through the steps on how to figure this problem?
*March 16, 2012*

**english 11**

D D A A B B
*March 14, 2012*

**organic chemistry**

gas chromatographic analysis of a mixture of organic compounds gave the following peak areas: 2-hexene= 2.5 2-bromogexane=4.0 2-henanol=1.8, calculate the mole percent compostion of the mixture
*March 14, 2012*

**Help please ???**

Verify the given linear approximation at a = 0.Then determine the values of x for which the linear approximation is accurate to within 0.1. (Enter your answer using interval notation. Round your answers to three decimal places.) (1+2x)^(1/4)¡Ö 1 +(1/2)x
*March 13, 2012*

**physics**

How far (in meters) above the earth's surface will the acceleration of gravity be 27.0 % of what it is on the surface? can someone please just give me an equation to figure this out please I am lost
*March 13, 2012*

**chemisty**

would you do the same thing to find out how many moles of 50 microliters of 18M sulferic acid?
*March 12, 2012*

**chemisty**

how do you convert 50 microliters of 2 butanol to moles?
*March 12, 2012*

**physics**

What is the maximum speed (in meters/second) with which a 1300 kg car can round a turn of radius 700 m on a flat road, if the coefficent of friction between tires and road is 0.530
*March 12, 2012*

**Chemistry 2**

An industrial chemical reaction has a rate law: rate = k [C]. The activation energy for the reaction is 3.0000 x 10^4 J/mol and A = 2.000 x 10^-3. What must be the reaction temperature if a rate of 1.000 x 10^-9 M/s is required and [C] must be kept at 0.03000M. Hint: What must...
*March 12, 2012*

**MATH...YUCK!!!H8 IT **

IM DOING A PROJECT FOR SCHOOL AND CAN"T FIND THE ANSWER.... WHY IS Pi so important?
*March 11, 2012*

**Math PLEASE HELP ME!!**

why son't you do it yourself. I'm not here to do your homework if you don't know this than that's really sad.
*March 7, 2012*

**Calculus**

If I factor it out, it'll be 17t/4 + 500. then plug in 3 17(3)/4+500=512 x 1000 =512,750. therefore the population would be 512,750?
*March 7, 2012*

**Calculus**

Could someone explain this question please. Suppose the population (in thousands of a certain species of insect after t months is described by the function p(t)=4t+ (100t)/(t^2+400) + 500. Determine the maximum population in the first three months.
*March 7, 2012*

**Calculus-verify **

What is the second derivative of f(x) = 5/3x^(3) - x^(3/2) + 6? Second derivative of f(x) = 5/3x^(3) - x^(3/2) + 6 is f''(x)=10x + 3/(4sqrt of x)
*March 7, 2012*

**Science**

Radioactive substance decays so that after t years, the amount remaining, expressed as a percent of the original amount, is A(t)=100(1.6)^(-t). a) Determine the function A’, which represent the rate of decay of the substance. b) what is the half-life for this substance? c...
*March 6, 2012*

**Physics**

Yes, I do have calculus. So the acceleration function is -60(0.7t)(In0.7) b) What is the accerlation at t=2s? -60(0.7(2))(In0.7)= 29.996. The acceleration would be 29.99 m/s^2? --------------------------------------- How do I do part c and d?
*March 6, 2012*

**Physics**

I have no idea how to do this question. Would be appreciated if someone help =) The velocity of a car is given by v(t)=60(1-[0.7]^t), where v is measured in m/s and t is measured in s. Determine the following: a)What is the acceleration function? b) What is the accerlation at ...
*March 6, 2012*

**Calculus**

2. Determine the minimum value of the function f(x)= e^(-x) - 2e^x on the interval -1≤x≤2. Answer is minimum value 7.12?
*March 6, 2012*

**Calculus**

I have no idea how to do this question. Would be appreciated if someone help =) The velocity of a car is given by v(t)=60(1-[0.7]^t), where v is measured in m/s and t is measured in s. Determine the following: a)What is the acceleration function? b) What is the accerlation at ...
*March 6, 2012*

**Calculus**

1.Determine the maximum value of the function f(x)= 5^x -x^5 on the interval 0≤x≤≤2. 2. Determine the minimum value of the function f(x)= e^(-x) - 2e^x on the interval -1≤x≤2.
*March 6, 2012*

**Chemistry**

At a given temperature, the elementary reaction A <=> B in the forward direction is first order in A with a rate constant of 2.60 x 10^-2 s^-1. The reverse reaction is first order in B and the rate constant is 8.50 x 10^-2 s^-1. What is the value of the equilibrium ...
*March 5, 2012*

**Calculus**

Determine the point on the curve y^2=4x that is closest to the point (1,0) a) (0,0) b) (1,2) c) (0.5,sqrt of 2)
*March 5, 2012*

**Calculus**

Determine the absolute extreme values of f(x)=4√x -2x on the interval [1,4] I found the derivative of f(x)=4√x -2x f'(x)=2/x^(1/2) - 2 - I have no idea what to do now.
*March 5, 2012*

**Calculus**

Thank you!
*March 5, 2012*

**Calculus**

What values of x is there an absolute minimum for the function y= -1/3x^2 + 2x? I found the derivative of the function which is y'=-2/3x + 2 set it to 0=y'=-2/3x + 2 x=3 What do I do now?
*March 5, 2012*

**Calculus**

The fuel efficiency, E, in litres per 100 km, for a car driven at speed v, in km/h is E(v)=1600v/(v^2+6400) a)If the speed limit is 50 km/h, determine the legal speed that will maximize the fuel efficiency. Could someone explain to me why the legal speed is 50 km/h to maximize...
*March 5, 2012*

**Calculus**

Could someone help me with these questions. If an equation s(t)=t^3 - 2t^2 + 1 describes an object's motion in metres, at what time t, in seconds, will the object be stationary? a) 1s b) 0s and 4/3s c) 0s d) 4/3s -------------------------------------- A box is to be ...
*March 4, 2012*

**Calculus**

Could someone help me with these questions. If an equation s(t)=t^3 - 2t^2 + 1 describes an object's motion in metres, at what time t, in seconds, will the object be stationary? a) 1s b) 0s and 4/3s c) 0s d) 4/3s -------------------------------------- A box is to be ...
*March 4, 2012*

**Chemistry**

you think you could help me with another? How many moles of chlorine are needed to react with 2.5 moles of sodium?
*February 28, 2012*

**Chemistry**

thank you(:
*February 28, 2012*

**Chemistry**

6*2=12/1= 12? am i right?
*February 28, 2012*

**Chemistry**

How many moles of sodium chloride (salt) can be made from 6 moles of chlorine?
*February 28, 2012*

**chemistry**

a gas sample is collected at 16 degrees c and 0.982 atm. if the sample has a mass of 7.40 g and a volume of 3.96 l, find the volume of the gas at stp and the molar mass?
*February 28, 2012*

**algebra 2**

solve -x^2+6x-15=0
*February 28, 2012*

**Science**

hehehehehehehe
*February 27, 2012*

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