Thursday

April 24, 2014

April 24, 2014

Number of results: 17,066

**Chemistry**

An empty flask weighs 128.632g. After vaporization of a sample of volatile liquid, at a measured temperature of 99.8 C. The flask is sealed, cooled to room temperature, and weighed. The mass is now 129.225g. The measured P atm is 757.7 torr. The flask is rinsed and filled ...
*Wednesday, April 6, 2011 at 11:46pm by Shannon*

**Physics **

A 21.1 g ball of clay is thrown horizontally at + 38.7 m/s toward a 1.2 kg block sitting at rest on a frictionless surface. The clay hits and sticks to the block. A. What is the speed of the block and clay right after the collision? m/s B. Use the block's initial and final ...
*Wednesday, November 7, 2012 at 11:07pm by Courtney *

**physics**

please help i cannot figure this out A 0.27 kg ball of dough is thrown straight up into the air with an initial velocity of 12 m/s. Find the momentum of the ball of dough halfway to its maximum height on the way up. and A 61 kg pole-vaulter falls from rest from a height of 6.6...
*Monday, March 21, 2011 at 7:01pm by luke*

**Chemistry**

Calculate the final concentration for the standardization of KMnO4 given this information: 2MnO4- + 5C2O4^-2 + 16H+ -> 2Mn^2+ + 10CO2 + 8H2O [final redox equation] Volume of KMnO4 titrated with H2SO4 + Na2C2O4 = 293 mL Volume KMnO4 titrated with H2SO4 alone = 0.2 mL Amount ...
*Wednesday, May 2, 2012 at 1:15pm by Katherine*

**Chemistry**

Concentrated sulfuric acid is 18.4 molar and has a density of 1.84 grams per milliliter. After dilution with water to 5.20 molar the solution has a density of 1.38 grams per milliliter. This concentration of H2SO4 is often used in lead storage batteries(like a car battery). 1....
*Thursday, January 13, 2011 at 7:34am by K*

**mechanics of materials**

A cylindrical tank with flat endplates is constructed from two sections that are welded together circumferentially.The outer diameter of the tank is 1.20, and the wall of the tank is 20.0 mm thick and the mamimum internal pressure is 2.00 MPa. (a) Calculate the maximum hoop ...
*Saturday, February 9, 2013 at 12:08pm by dmkp*

**mechanics of materials**

A cylindrical tank with flat endplates is constructed from two sections that are welded together circumferentially.The outer diameter of the tank is 1.20, and the wall of the tank is 20.0 mm thick and the mamimum internal pressure is 2.00 MPa. (a) Calculate the maximum hoop ...
*Saturday, February 9, 2013 at 1:02pm by dmkp*

**mechanics of materials**

A cylindrical tank with flat endplates is constructed from two sections that are welded together circumferentially.The outer diameter of the tank is 1.20, and the wall of the tank is 20.0 mm thick and the mamimum internal pressure is 2.00 MPa. (a) Calculate the maximum hoop ...
*Sunday, February 10, 2013 at 8:36am by dmkp*

**Physics**

Assume that in interstellar space the distance between two electrons is about 0.87 cm. The electric force between them are repulsive. Calculate the electric force between these two electrons. The value of the Coulomb constant 9 × 109 N · m2/C2 and the elemental charge is 1.6...
*Sunday, March 3, 2013 at 10:01am by Terry*

**Microecon**

Using the midpoints approach to the cross elasticity of demand-calculate the cross eleasticity the demand for golf at all 3 prices. Price Demand1 D2 D3 50 15 10 15 35 25 15 30 20 40 20 50 D1 -Income $50k per yr, movies $9 D2 -Income $50k -movies $11 D3 -Income $70k -movies $11...
*Thursday, November 1, 2012 at 11:01am by AJ*

**I need HELP bad! Macroeconomics!**

1). Kelly purchased ten shares of Gentech stock for $200 in year 1 and sold all the shares in year 2 for $220 a share. Between year 1 and year 2, the price level increased by 5%. The tax on capital gains is 50%. If the capital gains tax is on nominal gains, calculate how much ...
*Tuesday, May 20, 2008 at 6:14pm by Sarah*

**physical**

A proton resistor spring system in a magnetic field going out of the page has a mass of proton 1.67*10^-27 kg, a spring constant k=500 N/m and the resistor has r=5Ω. The magnetic field strength is 0.8T. a) When released from rest, calculate the maximum displacement. b) ...
*Tuesday, March 30, 2010 at 10:30pm by Thomas *

**Physics**

A catapult on a cliff launches a large round rock towards a ship on the ocean below. The rock leaves the catapult from a height H of 31.0 m above sea level, directed at an angle q above the horizontal with an unknown speed v0. a. The projectile remains in flight for 6.00 ...
*Thursday, November 5, 2009 at 5:33pm by Anonymous*

**Physics**

Calculate the Patm And the pressure exerted by water on the block - The area Of the upper face of block is 40 cm2 Calculate the total pressure exerted on the solid Given : In the first tube : in a tube a solid .. the height from solid to the water level in the tube is 8o cm & ...
*Friday, April 23, 2010 at 11:35am by Nana*

**mechanical properties of materials**

A cylindrical tank with flat endplates is constructed from two sections that are welded together circumferentially.The outer diameter of the tank is 1.20, and the wall of the tank is 20.0 mm thick and the mamimum internal pressure is 2.00 MPa. (a) Calculate the maximum hoop ...
*Saturday, February 9, 2013 at 3:37pm by dmkp*

**Physics**

A. Calculate the force on an alpha particle in an electric field E=Exm where E=3.6E4 N/C and x is a unit vector in the x direction. What is the direction of the force? B. Calculate the acceleration of the alpha particle in this electric field. What is the direction of the ...
*Sunday, December 11, 2011 at 2:28am by Kate*

**physics**

A copper calorimeter of mass ()g contains 380g of a liquid at 12degrees Celsius. A 20W heater is used for 3 minutes to raise the temperature of the liquid and calorimeter to 17 degrees Celsius. The calorimeter has a specific heat capacity of 400 J/K kg a.Calculate the heat ...
*Thursday, March 22, 2012 at 6:47am by Matteo*

**calculus**

calculate Äƒ/Äx and Äƒ/Äy. ƒ(x,y) = xy² + x²y
*Saturday, December 8, 2007 at 12:12am by Anibal*

**math**

And if f(x)=1/2 and g (x)=x-2 how do i calculate: F-1 (4)
*Tuesday, April 15, 2008 at 12:15pm by lance*

**math**

calculate (x-3)(x+2)
*Wednesday, May 7, 2008 at 3:03pm by jenna*

**Statistics**

Calculate: 8 8 7 6 8 7 6 5 P P P P C C C C 3 4 6 1 3 5 2 0
*Friday, March 25, 2011 at 5:48am by Pavlos Cs*

**math**

calculate 10^1.27 how do i do this?
*Saturday, May 12, 2012 at 8:15am by hannah*

**calculus**

Calculate dy/dx if Ln(x+y)=e^x/y
*Thursday, November 17, 2011 at 8:34pm by Tracy*

**Chemistry**

[H^+] = 2.7 x 10^-3 Calculate for [OH^-] [OH^-] = ? M
*Sunday, February 26, 2012 at 8:46pm by Matt*

**Algebra**

How do I calculate 4^n=1/(2(n-n^2))? Thanks.
*Thursday, March 1, 2012 at 2:53am by Helga*

**Economics**

how to calculate Qd=15.0-0.2P
*Saturday, March 3, 2012 at 2:50am by Dee*

**algebra**

Calculate. 7[6+(8)^3]
*Wednesday, July 25, 2012 at 9:58am by Christina*

**math**

f f(x) = 2x and g(x) = ½ , calculate f(x) • g(x)
*Friday, August 31, 2012 at 11:40am by gff*

**maths**

how to calculate 36^6/7 ???
*Monday, February 11, 2013 at 11:53am by tuhituhi*

**math**

calculate: 6% + 1.2 * 8%
*Saturday, November 30, 2013 at 6:54pm by Serenity1*

**physics**

a worker lays a rubber handled 0.500kg hammer down a sloped roof. it slides down the roof to a level portion of the roof where it slides another 2.oo m long this horizontal surface. the coefficient of friction between the rubber handle and the shingles is 0.850 a)draw free ...
*Saturday, January 12, 2013 at 3:15pm by teed*

**Stats ()**

Coal is carried from a mine in West Virginia to a power plant in Pittsburgh in hopper cars on a long train. The automatic hopper car loader is set to put 75 tons of coal into each car. The actual weights of coal loaded into each car are normally distributed with an average of...
*Friday, July 12, 2013 at 6:31pm by penelope*

**physics**

A proton resistor spring system in a magnetic field going out of the page has a mass of proton 1.67*10^-27 kg, a spring constant k=500 N/m and the resistor has r=5Ω. The magnetic field strength is 0.8T. a) When released from rest, calculate the maximum displacement. b) ...
*Tuesday, March 30, 2010 at 10:31pm by Thomas *

**Chemistry**

XeF2 is a linear molecule with vibrational frequencies of 515 cm–1 (symmetric stretch), 555 cm–1 (antisymmetric stretch) and 213 cm–1 (bend). A vibrational Raman spectrum is acquired using radiation at 488 nm from an argon-ion laser. Predict, with justification, which ...
*Sunday, May 22, 2011 at 2:48pm by Alice*

**Grade 12 physics**

At the beach, 3 children pull on a floating toy. Child 1 plus with a force of 15N [N 24°E], child 2 pulls south and child 3 pulls west. The net force of the toy is zero. Assume that there are no other significant forces acting on the toy. a) Calculate the magnitude of the ...
*Sunday, September 29, 2013 at 1:09pm by keisha*

**Macroeconomics**

1). Kelly purchased ten shares of Gentech stock for $200 in year 1 and sold all the shares in year 2 for $220 a share. Between year 1 and year 2, the price level increased by 5%. The tax on capital gains is 50%. If the capital gains tax is on nominal gains, calculate how much ...
*Tuesday, May 20, 2008 at 6:01pm by Sarah*

**physics**

in an electron microscope, a tungstun cathode with work function 4.5 eV is heated to release electrons that are then initially at rest just outside the cathode. The electrons are accelerated by a potential difference to create a beam of electrons with a de Broglie wavelength ...
*Monday, June 9, 2008 at 10:06pm by shelly*

**Chemistry**

You are asked to prepare 500. mL of a 0.150 M acetate buffer at pH 5.00 using only pure acetic acid, 3.00 M NaOH, and water. Calculate the quantities needed for each of the following steps in the buffer preparation. 1. Add acetic acid to ~400 mL of water in a 500 mL beaker. ...
*Friday, September 28, 2012 at 2:33am by Kw1h*

**Economics**

Help The answer i got is : GDP grew 10% GDP for 2006 using 2005 as the base year increase by 20% real GDP grow? 10% If i'm right, let me know, if not, please show Calculation Thank You Use the following data to answer questions 1-3 (be sure to provide all calculations). ...
*Monday, December 1, 2008 at 10:27pm by Randy Johnson*

**physics**

Two pucks collide on an air hockey table. Puck A has a mass of 17.0 g and is initially traveling in the +x direction at 7.00 m/s. Puck B has a mass of 51.0 g and is initially at rest. After the pucks collide, puck A moves away at an angle of 52.0 deg above the +x axis, while ...
*Monday, March 24, 2014 at 9:47am by Tsion*

**Chemistry**

The ionisation of water plays an important role in the equilibria of aqueous solutions. Kw= 1.008 x 10-14 mol2 dm-6 at 298K. (a) Calculate the pH of the following solutions at 298K showing all your working. Assume full dissociation in each case. (i) 0.054 mol dm-3 aqueous HNO3...
*Sunday, April 22, 2012 at 3:10pm by Henry*

**Chemistry**

Molar volume of an ideal gas at S.A.T.P. (25oC and 1.00 bar is 24.8 dm3 mol-1. Assume that gases are at 225oC and P=1.00 atmosphere before and after the combustion and behave as ideal gases. The chemical equation for the combustion of butane is: 2C4H10(g) + 13O2(g) → ...
*Friday, February 10, 2012 at 6:28am by JRMM*

**Physics **

A block of mass m1 is connected to an empty bucket of mass 1.35 kg by a cord over a frictionless pulley. The coefficient of the static friction between the table and the block is 0.45 and the coefficient of kinetic friction between the table and the block is 0.32. Water is ...
*Monday, May 2, 2011 at 3:40pm by Mawuli*

**Chemistry**

Calculate the temperature change in the water upon complete melting of the ice. Hint: Determine how much heat is absorbed by the melting ice and then use q =mC*Delta T to calculate the temperature change of the 314 g of water. under the following conditions: A 14.7 g ice cube ...
*Thursday, November 18, 2010 at 1:32am by Ricardo*

**Chemistry(Please check)**

. Ksp for Fe(IO3)3 is 10-14. Two solutions, one being iron(III) nitrate and the other being sodium iodate, were mixed. At the instant of mixing, [Fe3+] = 10-4M and [IO3-] = 10-5M. What happens? My answer is that a precipitate forms because Qsp > Ksp. Would you agree? ...
*Monday, April 9, 2012 at 9:51pm by Hannah*

**Physics**

In a playground, there is a small merry-go-round of radius 1.20 m and mass 190 kg. Its radius of gyration (see Problem 85 of Chapter 10) is 91.0 cm. A child of mass 44.0 kg runs at a speed of 4.50 m/s along a path that is tangent to the rim of the initially stationary merry-go...
*Monday, October 26, 2009 at 10:46pm by Ray*

**Mathematics**

an aircraft's reading shows time 8:55 at distance travelled 957km time 9:07 at distance travelled 1083 calculate distance travelled in km calculate the average speed of aircraft in km/h (for the 1st question 1083-957= 126km) (the second one should i add 1083+957km then divided...
*Thursday, July 26, 2012 at 11:47am by INDIANA *

**Physics**

I have to design a procedure which will allow me to calculate the applied force(thrust) of a stomp rocket. We are allowed to use tools to find measurements. So far, I have calculated the height that the rocket reached (22.5) m using trig. (right angle triangle where one angle ...
*Thursday, July 22, 2010 at 3:35pm by Mackenzie*

**Physics**

When William Tell shot the apple off his son's head, the arrow remained stuck in the apple, which means the collision between the arrow and apple was totally inelastic. Suppose that the velocity of the arrow was horizontal at 75 m/s before it hit, the mass of the arrow was 45 ...
*Sunday, April 12, 2009 at 10:24pm by Claire*

**Chemistry**

Suppose that 30.0 mL of 0.20 M C6H5COOH(aq) is titrated with 0.30 M KOH(aq). Refer to table 1 and table 2. (a) What is the initial pH of the 0.20 M C6H5COOH(aq)? Using ICE i found to be 2.46 The rest I do not know how to set up or solve... (b) What is the pH after the addition...
*Friday, March 12, 2010 at 3:58pm by Val*

**Physics -Bungee Jumping Problem**

A 75kg person jumps off a tower with a bungee cord tied around their leg. The cord obeys Hooke's Law and has a cord constant value of k=50 Nts/m. After falling a distance of 15m, the cord begins to stretch. Neglecting air resistance and the mass of the cord, a) calculate how ...
*Wednesday, February 21, 2007 at 10:19pm by kbmr*

**PHYSICS!!!**

A liquid (ñ = 1.65 g/cm3) flows through a horizontal pipe of varying cross section as in the figure below. In the first section, the cross-sectional area is 10.0 cm2, the flow speed is 288 cm/s, and the pressure is 1.20 105 Pa. In the second section, the cross-sectional area ...
*Sunday, November 11, 2012 at 5:33pm by k*

**POPULATION**

If a population consists of 10,000 individuals at time t=0 years (P0), and the annual growth rate (excess of births over deaths) is 3% (GR), what will the population be after 1, 15 and 100 years (n)? Calculate the "doubling time" for this growth rate. Given this growth rate, ...
*Tuesday, October 6, 2009 at 11:16pm by Anonymous*

**sociology**

Describe other measurements sociologists use to calculate prejudice. http://www.jiskha.com/search/search.cgi?query=Describe+other+measurements+sociologists+use+to+calculate+prejudice
*Saturday, June 30, 2007 at 5:55pm by ann*

**physics**

a) A set of crash tests consists of running a test car moving at a speed of 12.6 m/s (27.7 m/h) into a solid wall. Strapped securely in an advanced seat belt system, a 69.0 kg (151.8 lbs) dummy is found to move a distance of 0.600 m from the moment the car touches the wall to ...
*Monday, February 27, 2012 at 1:28pm by Katie*

**kinetics**

a stationary car is hit from behind by another car travelling at 40km per hr. After collision both cars remain locked together. The masses of the stationary car and the moving car are 1500kg and 1300kg respectively (use g=9.8ms-2) a) is this an elastic or inelastic collision b...
*Thursday, March 8, 2012 at 5:54pm by dmkp*

**kinetics**

a stationary car is hit from behind by another car travelling at 40km per hr. After collision both cars remain locked together. The masses of the stationary car and the moving car are 1500kg and 1300kg respectively (use g=9.8ms-2) a) is this an elastic or inelastic collision b...
*Friday, March 16, 2012 at 6:15am by dmkp*

**kinetics**

a stationary car is hit from behind by another car travelling at 40km per hr. After collision both cars remain locked together. The masses of the stationary car and the moving car are 1500kg and 1300kg respectively (use g=9.8ms-2) a) is this an elastic or inelastic collision b...
*Friday, March 16, 2012 at 6:17am by dmkp*

**kinetics**

a stationary car is hit from behind by another car travelling at 40km per hr. After collision both cars remain locked together. The masses of the stationary car and the moving car are 1500kg and 1300kg respectively (use g=9.8ms-2) a) is this an elastic or inelastic collision b...
*Wednesday, March 28, 2012 at 12:51pm by dmkp*

**science**

The moon is the earth's nearest neighbor in space the radius of the moon is approximately one quarter of the earth's radius and it's mass is one eightieth of the earth's mass.(a)calculate the weight of an object with a mass of 50.0kg on the surface of the moon.(b)calculate the...
*Thursday, February 21, 2013 at 4:21pm by lebo*

**12 Chemistry**

What is the molar enthalpy of combustion of magnesium? This was the lab question that I was asked to find after performing a lab based on Hess' law. I can't find anywhere in my notes how to calculate this, and the text book doesn't explain their steps properly, and I have ...
*Saturday, March 29, 2008 at 10:58am by Chase (sorry if this long)*

**Chemistry**

given 6.7 grams of sodium acetate and 6.7 g of magnesium acetate, calculate the number of moles of acetate in sodium acetate. calculate the number of moles of acetate in magnesium acetate.
*Sunday, August 28, 2011 at 9:36am by Jessica*

**Chemistry**

Suppose that 50.0 mL of 0.25 M CH3NH2(aq) is titrated with 0.35 M HCl(aq). (a) What is the initial pH of the 0.25 M CH3NH2(aq)? (b) What is the pH after the addition of 15.0 mL of 0.35 M HCl(aq)? (c) What volume of 0.35 M HCl(aq) is required to reach halfway to the ...
*Wednesday, November 3, 2010 at 5:00pm by Dana*

**Physics**

In a playground, there is a small merry-go-round of radius 1.20 m and mass 190 kg. Its radius of gyration (see Problem 85 of Chapter 10) is 91.0 cm. A child of mass 44.0 kg runs at a speed of 4.50 m/s along a path that is tangent to the rim of the initially stationary merry-go...
*Monday, October 26, 2009 at 11:18pm by Ray*

**physics**

An unstable atomic nucleus of mass 17.0 ¡Ñ 10¡V27 kg which is at rest disintegrates into three particles. One of the particles, of mass 5.00 ¡Ñ 10¡V27 kg, moves in the y direction with speed 4.50 Mm/s. Another, with mass 8.40 ¡Ñ 10¡V27 kg, moves in the x direction with speed ...
*Monday, March 28, 2011 at 4:29am by Matthew*

**physics**

A square plate made of copper has a length of 4.253 m on a side, at 15.00 degrees Celsius. A hole is drilled in the plate, the diameter of which is 1.750 m. The plate is heated to 177.00 degrees Celsius. Assume that alpha= 16.8* 10^-6 for copper. A) calculate the length of a ...
*Monday, March 7, 2011 at 10:54am by Shreya*

**chemistry**

When 1.0 mol of ammonia gas in injected into a o.50L flask, the following reaction proceeds to equilibrium. 2NH3 <--> N2 (g) + 3H2 (g) At equilibrium, 0.30 mol of hydrogen gas is present. a) calculate the equilibrium concentrations of N2 and Nh3. b) what is the value of ...
*Sunday, November 26, 2006 at 2:39pm by Luke*

**MATH**

If a population consists of ten thousand individuals at time t=0 (P0), and the annual growth rate (excess of births over deaths) is 3% (GR), what will the population be after 1, 15, and a 100 years (n)? Calculate the "doubling time" for this growth rate. Given this growth rate...
*Friday, October 9, 2009 at 11:16am by HEENA*

**Biochemistry**

You wish to measure the change in G°'for the hydrolysis of ATP: ATP ---> ADP + Pi but the equilibrium for the hydrolysis lies so far toward products that analysis of the ATP concentration at equilibrium is neither practical nor accurate. However, you have the following data...
*Saturday, September 12, 2009 at 7:56pm by Mallory*

**chemistry**

CH3NH2(aq)+H2O(l)=>CH3NH3+(aq)+OH-(aq) Kb=4.4 x 10^-4 Methylamine, CH3NH2, is a weak base that reacts with water according to the equation above. A student obtains a 50.0 mL sample of a methylamine solution and determines the pH of the solution to be 11.77. (a) Write the ...
*Thursday, April 4, 2013 at 6:08pm by ashdawg*

**AP Chemistry**

CH3NH2(aq)+H2O(l)=>CH3NH3+(aq)+OH-(aq) Kb=4.4 x 10^-4 Methylamine, CH3NH2, is a weak base that reacts with water according to the equation above. A student obtains a 50.0 mL sample of a methylamine solution and determines the pH of the solution to be 11.77. (a) Write the ...
*Thursday, May 2, 2013 at 12:41am by Christina*

**chemistry**

how to calculate persenteil
*Tuesday, March 11, 2008 at 6:44am by Anonymous*

**math**

For the vectors u=(2,-3) and w=(-1,2), calculate |-3u| - |2w|.
*Friday, April 4, 2008 at 5:34pm by Devon*

**maths**

f(x)= 2x+5/x-4 and g(x)=2x-3 1)Calculate the value of g(4) 2)fg(2) 3)g`1 (7)
*Wednesday, April 9, 2008 at 10:19am by cassie*

**Algebra**

Calculate the value of |7.3| – |–2.1|
*Monday, June 1, 2009 at 1:13pm by Laurie*

**Calculus**

Given that f(x)=x^6h(x) h(-1)=3 h'(-1)=6 Calculate f'(-1).
*Friday, September 4, 2009 at 4:54pm by Z32*

**math**

how do you calculate 12 2/3 minus5 7/9
*Wednesday, January 20, 2010 at 11:46pm by darion*

**Chemistry**

How do you calculate Cwater?
*Tuesday, July 27, 2010 at 4:29pm by Anonymous*

**math**

calculate the discriminant of 3x^2 - 4x + 2
*Saturday, October 30, 2010 at 12:36pm by jake*

**calculus**

Calculate the integral from 0 to 4 of |x^2 - 1|. Thanks!
*Monday, November 8, 2010 at 9:09pm by Jp*

**chemistry**

Calculate the pH of 3.9 10-8 M HNO3.
*Sunday, November 28, 2010 at 9:47pm by justin*

**Chemistry**

Calculate the [H+] in a solution that has a pH of 9.00.
*Saturday, May 14, 2011 at 10:49pm by teena*

**Chemistry**

Calculate the [H+] in a solution that has a pH of 9.00.
*Saturday, May 14, 2011 at 10:49pm by teena*

**chemistry**

calculate the solubility of na cl
*Tuesday, June 21, 2011 at 10:20am by shafie*

**Chemistry**

Calculate the ph of 10^-8 M (HCL).
*Wednesday, June 29, 2011 at 1:05pm by gagan *

**mahs**

calculate the range for 20,44,18,16,27,20,14,18,22,27,16
*Saturday, November 5, 2011 at 1:47pm by dorcas*

**calculus**

calculate y = log_10(x) where x = 0.3
*Monday, January 23, 2012 at 4:53pm by Sara*

**maths**

calculate the derivative of x^5-x+2/x^3+7
*Friday, February 3, 2012 at 1:43am by victor.m*

**Chemistry**

Calculate the pH of 1.7M of KCl
*Wednesday, July 4, 2012 at 1:19pm by Lynette*

**chem**

What is the formula to calculate qp?
*Thursday, July 12, 2012 at 2:54am by lani*

**math**

how i calculate this equation 32/14*6+40-8
*Tuesday, October 9, 2012 at 10:47am by navi*

**math**

Calculate the sum of 1/4 and 1/3.
*Tuesday, February 12, 2013 at 12:45pm by monet*

**math**

Calculate the sum of 1/4 and 1/3.
*Wednesday, February 13, 2013 at 1:45pm by Anonymous*

**Calculus**

calculate the derivative (2,5) (2.1,5.3) h'(2) if h(x)=(f(x))^3 k'(2) if k(x)=f(x))^-1 g'(5) if g(x)=f^-1(x)
*Monday, February 18, 2013 at 10:53pm by Jake*

**math**

please calculate: 67.95% * 9% + 27.98% * 5% + 4.08% * 7%
*Wednesday, November 27, 2013 at 10:07pm by Serenity1*

**math**

please calculate: 6% + 1.2 * 8%
*Saturday, November 30, 2013 at 8:33pm by Serenity1*

**geometry**

Calculate lengths of ap,bp,cp. A(0,0) B(0,2k) C(2h,0) P(h,k)?
*Wednesday, January 22, 2014 at 2:10pm by ann*

**science**

Bill finds an unusual object and wishes to calculate it's density. He discovers a problem of accurately weighing it, because it won't stay on the weighing pan. To solve this he adds the object to a beaker containing 59 mL of distilled water and finds the water level rises to ...
*Tuesday, August 18, 2009 at 10:54pm by Arthur*

**physics**

Two point charges, q1 and q2, are placed 0.30 m apart on the x-axis, as shown in the figure above. Charge q1 has a value of –3.0 x 10–9 C. The net electric field at point P is zero Q: Calculate the magnitude of charge q2. Q: Calculate the magnitude of the electric force on q2 ...
*Thursday, February 23, 2012 at 4:09pm by Kayberlynn*

**Chemistry**

I have had this question in my homework, and honestly I got stuck in these questions. I managed to convert 5.3g of Na2CO3 into moles, but then I got stuck and do not know what to do next to solve the question. If anyone knows how to work this out, help from anyone is greatly ...
*Saturday, September 29, 2012 at 5:04am by Matthias*

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