Wednesday

September 17, 2014

September 17, 2014

Total # Posts: 1,792

**Chemistry**

Calculate the change in pH if 0.050 g of solid NaOH is added to 250 mL of a buffer solution that contains 0.80 M NaH2PO4 and 0.17M Na2HPO4. I found the pH of the buffer solution to be 6.54.
*April 4, 2013*

**Programming and Design**

Draw the hierarchy chart and design the logic for a program that calculates the projected cost of an automobile trip. Assume that the user's car travels 20 miles per gallon of gas. Design a program that prompts the user for a number of miles driven and a current cost per ...
*April 3, 2013*

**Math**

I need to verify this equation and I get stuck after trying everything I can think of. Help! cos(4x)=4[sin(x)cos(x)-sin^3(x)cos(x)]
*April 2, 2013*

**physics**

A uniform, 264-N rod that is 2.05 m long carries a 225-N weight at its right end and an unknown weight W toward the left end. When W is placed 47.9 cm from the left end of the rod, the system just balances horizontally when the fulcrum is located 82.7 cm from the right end. ...
*April 2, 2013*

**Repost- Already Solved-Calculus**

is the inverse function of x+ floor(x) equal to x - floor (x/2) i got this after plotting points but i'm not sure. thank you Thank you 'gain!
*March 31, 2013*

**Chemistry**

Calculate both the moles and grams in each of the following? a. 6.02 x 10^23 atoms of Na e. 3.01 x 10^23 atoms of S
*March 24, 2013*

**Math**

write an equation which must be true if the line from p(x,y) to a(25,0) is perpendicular to the line from P(x,y) to the center of the circle x^2+y^2=400
*March 23, 2013*

**Math**

write an equation which must be true if the line from p(x,y) to a(25,0) is perpendicular to the line from P(x,y) to the center of the circle x^2+y^2=400
*March 23, 2013*

**physics**

After falling from rest from a height of 26 m, a 0.49-kg ball rebounds upward, reaching a height of 16 m. If the contact between ball and ground lasted 1.8 ms, what average force was exerted on the ball?
*March 20, 2013*

**Accounting 202**

I would suggest lowering miscellaneous expenses. They seem to be a large amount and we do not know what for. This takes away from the companies revenue and budget for the next year. Also, you could look at the COGS and see if producing more would provide more profit. If more ...
*March 18, 2013*

**Math**

Belmont Records produces DVD records. The fixed costs for producing a record are $160,000, and unit cost amount to 85 cents per record. The revenue is $5 per DVD. (a) How many DVDs must be sold in order to break even? (b) Find the profit or loss if 20,000 DVDs are sold. (c) ...
*March 17, 2013*

**Finite Math**

A Specialty shop owner used a revenue function and a cost-volume function to analyze his monthly sales. one month he found that with a sales volume of 1465 items he had revenues of $32,962.50 and a total cost of $26,405.50. Another month he had total costs of $17,638 on a ...
*March 16, 2013*

**Ms.Sue Help**

two numbers differ by 9.Four times the smaller is 5 more than twice the larger.Find the numbers.
*March 15, 2013*

**Help Please Math**

A principal of $2500 is invested,part at 8% per annum and the rest at 12% per annum. In a year, the 8% investment interest was doubled the 12% investment interest. How much invested at each rate? Express in the form Ax+By=C
*March 15, 2013*

**Math**

Two numbers differ by 9. 4 times the smaller is 5 more then twice the larger. Find the numbers.
*March 15, 2013*

**calculus**

Given ƒ(x) = 2x^2 - 3x - 1 find the slope and equation of the tangent line to ƒ at the point (1, -2)
*March 13, 2013*

**physics**

Shyanne (60 kg) has to walk across a single rope bridge to cross a river. When she's at the exact middle point, the rope bridge is deflected at an angle of 15 degrees from the horizontal. What is the tension in the bridge?
*March 10, 2013*

**math**

what is 4x+2=26,then 4x8=
*February 26, 2013*

**Biology**

Which of the following mutations would you expect to have the greatest effect on a living cell? A. A mutation that changes a single base in a region of noncoding DNA B. Energy release from plutonium C. Consumptions of preexisting organic compounds Im clueless!!!
*February 25, 2013*

**Survey of Calculus**

For the function below, find the slope of the tangent line at x=2 (5x^(4)+4)/(-2x^(3)+7) Can someone explain how to do this?
*February 24, 2013*

**Biology**

Which of the following mutations would you expect to have the greatest effect on a living cell? A. A mutation that changes a single base in a region of noncoding DNA B. Energy release from plutonium C. Consumptions of preexisting organic compounds
*February 24, 2013*

**Biology**

Which of the following mutations would you expect to have the greatest effect on a living cell? A. A mutation that changes a single base in a region of noncoding DNA B. Energy release from plutonium C. Consumptions of preexisting organic compounds Im clueless!!!
*February 24, 2013*

**math**

the shaded part isthe outside of the square. so how would i find that part?
*February 23, 2013*

**math **

find the area of the shaded region in the figure assuming the quadrilateral inside the circle is a square. x^2+y^2=36 (the picture is of a square inside a circle on a coordinate plane)
*February 23, 2013*

**physics**

a curling rock with a mass 22 kg is traveling 0 degrees at 3m/s and collides with a stationary object with the same mass the collision is a glancing one and the struck roce is moving 1m/s at 65 degrees what is the velocity after the collision
*February 19, 2013*

**science**

Can you help me with an acrostic for science pertaing to plants
*February 19, 2013*

**Finite Math**

The amount desired in a sinking fund is given. Find the periodic payments required to obtain the desired amount. A = $75,000, the interest rate is 7.2%, and payments are made quarterly for 4 years.
*February 18, 2013*

**Finite Math**

The amount (future value) of an ordinary annuity is given. Find the periodic payments. A = $14,500, and the annuity earns 6% compounded monthly for 10 years.
*February 18, 2013*

**Finite Math**

yeah you are right i just plug it in wrong , thanks soooo much!
*February 18, 2013*

**Finite Math**

didn't get it right, the answer in the book is 567.26
*February 18, 2013*

**Finite Math**

The amount (future value) of an ordinary annuity is given. Find the periodic payments. A = $2500, and the annuity earns 6.5% compounded annually for 4 years.
*February 18, 2013*

**Finite Math**

4403.80 is correct
*February 18, 2013*

**Finite Math**

Determine the amount of the ordinary annuities at the end of the given periods. $200 deposited monthly at 1% per month for 20 months.
*February 18, 2013*

**Finite Math**

yes thanks so much :D
*February 18, 2013*

**Finite Math**

Determine which is the better investment. 6.8% compounded semiannually or 6.6% compounded quarterly?
*February 18, 2013*

**Physics**

The back of the book says 227 km/h at 162.4 degrees
*February 18, 2013*

**Physics**

And your answer doesn't match the back of the book either.
*February 18, 2013*

**Physics**

lol can you solve this for me? We have done this multiple times (we think) and we are getting a different answer than that's in the back of the book
*February 18, 2013*

**Physics**

A plane is flying 25 degrees north of west at 190 km/h and encounters a wind from 15 degrees north of east at 45 km/h. What is the planes new velocity with respect to the ground in standard position?
*February 18, 2013*

**english**

We have to rewrite this correcting fragments and run on sentences can someone check my work below the original. Scientists report (1) that creatures living in the deep sea are in danger of starving to death. Millions of undiscovered species live, in the deep sea. Creatures in ...
*February 18, 2013*

**Finite Math**

Find (a) the final amounts and (b) the total interest earned on the original investment. 1. $4500 is invested at 7.5% compounded annually for 6 years.
*February 17, 2013*

**Finite Math**

How long will it take $800 to earn $18 at 6% simple interest?
*February 17, 2013*

**Finite Math**

Kathy borrowed $800 at 6% interest. The amount of interest paid was $144. What was the length of the loan?
*February 17, 2013*

**Chemistry**

How many grams of HCl need to be dissolved in 0.5L of water to prepare a solution of pH 1.5? Does anybody know how to work this out? Thanks :)
*February 13, 2013*

**Chemistry**

How many grams of HCl need to be dissolved in 0.5L of water to prepare a solution of pH 1.5? Does anybody know how to work this out? Thanks :)
*February 13, 2013*

**english**

Can someone please help, I'm supose to write explaining what advice one would give George and Lydia Hadley on how to be become better parents. I don't understand this passage so I don't know what to write. "I don’t know anything," he said, "...
*February 13, 2013*

**math**

What scale would you use for a room that is 12 feet by 15 feet on a 7 inch by 8 inch paper?
*February 13, 2013*

**math**

theres none
*February 11, 2013*

**math**

9/5xC)+32
*February 11, 2013*

**math**

theres none
*February 11, 2013*

**math**

what is 9/5x20)+32
*February 11, 2013*

**math**

what is expression 5 factorial equal
*February 11, 2013*

**math**

what is 85 nearest tenth
*February 11, 2013*

**math**

I need help with 40% equal x/30 what is x.
*February 11, 2013*

**math**

what is 3z-5+2z=25-5z
*February 11, 2013*

**english**

Scientists report (1) THAT CREATURES LIVING IN THE DEEP SEA ARE IN DANGER OF STARVING TO DEATH. Millions of undiscovered species live, in the deep sea. Creatures in the seabed are suffering from growing food shortages. Which may be a result of rising sea temperatures. ...
*February 6, 2013*

**english**

Scientist report that creatures living in the deep sea are in danger of starving to death. Millions of undiscovered species live in the deep sea. Creatures in the seabed are suffering from growing food shortages, which may be a result of rising sea temperatures. Scientist ...
*February 6, 2013*

**english**

SO all I need to do is moreless add sentences together to make complete sentences?
*February 6, 2013*

**english**

Scientists report (1) that creatures living in the deep sea are in danger of starving to death. Millions of undiscovered species live, in the deep sea. Creatures in the seabed are suffering from growing food shortages. Which may be a result of rising sea temperatures. ...
*February 6, 2013*

**grammar**

Scientists report (1) that creatures living in the deep sea are in danger of starving to death. Millions of undiscovered species live, in the deep sea. Creatures in the seabed are suffering from growing food shortages. Which may be a result of rising sea temperatures. ...
*February 6, 2013*

**Finance**

Orbital Communications has operating plants in over 100 countries. It also keeps funds for transaction purposes in many foreign countries. Assume that in 2010 it held 100,000 kroner in Norway worth $35,000. The funds drew 12 percent interest, and the krone increased 6 percent ...
*February 4, 2013*

**math**

a hiker travels for 15km on a bearing of 210T how far south is he please show working
*February 1, 2013*

**Chemistry**

Need for two balanced chemical equations? I am in need of these two equations which I however do not know how they react. If anyone could help, it is greatly appreciated :) "Formation of products by heating a solid mixture of calcium propanoate and soda lime" "...
*January 29, 2013*

**Physics, help!**

How many protons are needed to produce a total charge of 2.5*10^-15 C?
*January 27, 2013*

**Chemistry**

Air in the vicinity of a local power station contains 8.8x10^-4 gm^-3 SO2. What volume of 0.001moldm^-3 Iodine solution would be required to react with a solution obtained from 200dm^3 of contaminated air? The equation given is SO2 + I2 + 2H2O ==> H2SO4 + 2HI Thanks! :)
*January 26, 2013*

**Math**

What acceleration will cause a bus to travel a distance of 200 meters in 10 sec if it starts from rest
*January 21, 2013*

**Acceleration**

A toy car moves down an incline with an acceleration of 20 cm/s/s. what will its velocity be in 5 sec? what distance will it have traveled..?
*January 21, 2013*

**Physics**

A car starts from school gaining a speed at the rate of 2 km/min/sec. how long will it take to nave a speed of 50 km/min?
*January 21, 2013*

**Physics**

A jeep has a speed of 50 m/s at a given instant and 10 m/s later. fin its retardation, assuming it to be constant.
*January 21, 2013*

**Physics, help me please?!**

A car travels around a circular turn of radius 50 meters while maintaining a constant speed of 15m/s find the minimum value for the coefficient of friction necessary to keep the car on the road in icy conditions, the coefficient of friction drops to 0.15, Now find the maximum ...
*January 18, 2013*

**physics**

A small sphere of mass m=.0064kg and charge q1= +28.9 nC is attached to the end of a string and hangs vertically. A second charge of equal mass and charge q2= -58nC is located below the first charge by a distance d= 2.00cm. a. Find the Tension in the string b. If the string ...
*January 14, 2013*

**history**

please help me with this!!!!!! 13. Which statement below would an Islamist be most likely to agree with? (Points : 3) All aspects of society—political, legal, economic, social, and cultural—should be guided by strict Muslim teaching. If people of the Muslim world ...
*January 11, 2013*

**Science**

Students wer given materials to complete a circuit to turn on one light. The materials received were 2 wires, a AA battery, and various sizes of light bulbs. What is the variable in the experiment?
*January 10, 2013*

**Algebra**

IF Tony earned $600 after investing $3,000 for five years, what was his interest rate?
*January 10, 2013*

**trig**

Solve sin θ = -0.204 for 90º < θ < 270º. Give your answer to the nearest tenth of a degree. Honestly have no idea how to do this.
*January 8, 2013*

**Chemistry**

An aqueous solution of HCl has a high electrical conductivity when compared to the compound in hexane, whilst the conductivity of a solution of the compound in diethyl ether has an intermediate value. Explain.
*January 8, 2013*

**Chemistry**

An aqueous solution of (NH4)2SO4 has a pH lower than 7. Explain this observation. Thanks! :)
*January 3, 2013*

**US History**

I have a few questions about World War I that I can't seem to find information about in any textbooks or online: Was Russia forced to act in defense of Serbia to protect access to the warm water of the Black Sea? Did France extend support to Russia in an effort to recover ...
*January 2, 2013*

**Advanced Statistics**

What is Conceptual Framework...?
*January 1, 2013*

**Chemistry**

To 40cm^3 of 1mol AgNO3 is added 20cm^3 of 0.500 AlCl3. What is the molar concentration of the resulting AgNO3 solution. The reaction, if needed, is 3AgNO3 + AlCl3 ==> 3AgCl + Al(NO3)3 I worked out the number of moles present in AgNO3 which is 0.04 mol, and the number of ...
*December 30, 2012*

**Chemistry**

Woops I was mistaken! 0.02/0.25L ... the answer comes 0.08moldm^-3! thanks a million
*December 30, 2012*

**Chemistry**

A volume of 10cm^3 of 2M H2SO4 is placed in a volumetric flas of 250cm^3 and filled to the mark with distilled water. What is the molar conc. of the H2So4 in the flask? After I found how many moles there are in 10cm^3, which is 0.02 mol, what is my next step, as because the ...
*December 30, 2012*

**Chemistry**

A mixture containing 0.5 mol of H2 (g) and 0.5 mol of I2 (g) was introduced into a 10L container at a temperature of 448 C. At this temperature the equilibrium constant Kp is 50. i. What is the total pressure in the container before the reaction starts and at equilibrium. ii. ...
*December 26, 2012*

**Chemistry**

A mixture containing 0.5 mol of H2 (g) and 0.5 mol of I2 (g) was introduced into a 10L container at a temperature of 448 C. At this temperature the equilibrium constant Kp is 50. i. What is the total pressure in the container before the reaction starts and at equilibrium. ii. ...
*December 26, 2012*

**algebra 2**

In short: 2x^2-5x-3 becomes 2x^2-6x+x-3. Split and factorise for: 2x(x-3) 1(x-3) Which becomes: (2x+1)(x-3) x=-1/2 or x=3
*December 19, 2012*

**algebra 2**

Are you wanting it factorised? If so: multiply the constant, in this case '-3' by the co-efficient of x^2, so: (2x-3=6) Take the 2 off the co-efficient and replace the constant, -3, with -6, so you have: x^2 -5x -6 Find products of -6 that also add to make -5. The ...
*December 19, 2012*

**Physics**

what grade is this for?
*December 17, 2012*

**algebra**

The owner of a health food store combined cranberry juice that cost $7.79 per quart with apple juice that cost $7.19 per quart. how many quarts of each were used to make 10 quarts of cranberry juice mixture costing $7.61 per quart
*December 10, 2012*

**algebra**

Melissa drives her car 200 kilometers in 2.5 hours. How far can she drive in 6 hours at the same rate?
*December 6, 2012*

**math**

You have found a summer job manning a lighthouse off the northern coast of Vancouver Island. It is a lonely job and you feel the need for some mental stimulation. In your position, 40 m above sea level, you observe two sailboats in line with the lighthouse. The angles of ...
*December 4, 2012*

**Stats**

The Ledd Pipe Company has received a large shipment of pipes, and a quality control inspector wishes to estimate the average diameter of these pipes. A random sample of 18 pipes produces an average diameter of 2.56 mm with a standard deviation of 0.05 mm. You may assume that ...
*November 28, 2012*

**Stats**

Many colleges and universities hold a “blood drive” for organizations such as the Red Cross. To help with the planning of an upcoming blood drive, we want to estimate the proportion, p, of students and faculty who would be willing to donate a pint of blood. The Red ...
*November 28, 2012*

**chemistry**

how do i convert Pa to atm?
*November 27, 2012*

**chemistry**

calculate number of dichlorine molecules in a 5.00ml container at 40 degrees Celsius and a pressure of 2.14 x 10^4 Pa.
*November 27, 2012*

**math**

Determine all local and global extrema of the function f(x)=x(x−1)
*November 26, 2012*

**TRIF HELP**

No, but thank for the help
*November 20, 2012*

**TRIG HELP**

find the exact solutions over the interval tanx = 1 all real x
*November 20, 2012*

**Chemistry**

@DrBob222- Temperature does not need to be in Kelvin because it is a ratio, converting to Celsius would give her the same answer.
*November 19, 2012*

**Chemistry**

5.0 dm^3= 5 Liters (P1V1/T1)=(P2V2/T2) P1= .92 atm V1= 5.0 L T1=? P2= (800 mmHg/760 mmHg)= 1.05 atm (There are 760 mmHg in 1 atmosphere) V2= 5.7 L T2= 30 degrees Celsius ((.92 atm)*(5.0 L))/(T1)=((1.05 atm)*(5.7 L))/(30 Degrees) 4.6/T1= .1995 4.16/.1995= T1 T1= 20.8 Degrees ...
*November 19, 2012*

**math**

Suppose e^y=sin(x+cosy) Find dy/dx using implicit differentiation
*November 19, 2012*

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