Friday

August 1, 2014

August 1, 2014

Total # Posts: 1,729

**Chemistry**

Could you elaborate? I don't quite understand what that means.

**Chemistry**

Calculate the standard enthalpy change for the following reaction at 25 °C. MgCl2(s) + H2o(l) ---> MgO(s) + 2HCl(g)

**math **

thanks for your help Mrs.Sue

**math please help:asap**

what is the answer to: 3/5 + 1/3 + 1/6

**math**

what is the common factor Matty?

**math**

The answer is 1 1/10 you see just find the the common factor so kim that it little sis opps

**Calculus**

A ladder of length 10 metres is being drawn up a wall. The top of the ladder is moving upwards at 1 metre per second. Find the speed with which the foot of the ladder is approaching the wall when the foot is 6 metres from the wall.

**mathematic**

0.05

**finance**

what is the future value of $2000.00 given that it will be held in a bank for 9 years and earn an interest of 4%?

**physics**

You can paddle at 4.5 km/h and the river is ﬂowing at 3 km/h. How far downstream will you be in 44 min? Answer in units of km

**math**

So how many cakes?

**math**

An eight-inch square cake serves six people.how many twelve-inch square cakes do you need to provide equivalent servings for eighteen people?

**pre calculus**

Environmental Concerns: The spread of oil leaking from a tanker is in the shape of a circle. If the radius r (in feet) of the spread after t hours is r(t) = 200sqrt t, find the area A of the oil slick as a function of the time t. I dont get this at all. could someone please he...

**statistics**

0.57 of all college students like the idea of a new curriculum. If we select 88 students (ASSUME INDEPENDENCE), what is the Standard Deviation of (the Probability Distribution that would list the number of students (from 0 to 88) and the probability of each.) THE STANDARD DEVI...

**Chemistry**

Could somebody please explain why in gaseous reaction the collision frequency between molecules is far greater than the rate at which molecules react? Thanks! :)

**Chemistry**

But how can I explain it, concisely, in words?

**Chemistry**

The structures of NO and NO2 possess similarity to free radicals. How are they similar in electronic terms?

**Chemistry**

What method of purification is used to separate iodoethane from traces of hydrogen iodide? Thanks :)

**Chemistry**

On strong heating, 12g of NaHSO4 release 0.9g of water vapour and a white solid is left. Deduce a chemical formula for the solid. How can I work this out? Thanks :)

**Chemistry**

How is solvent extraction by ether used to separate organic entities from mixture of salt,phenol & phenylamine? Thanks!

**Chemistry**

How is solvent extraction by ether used to separate organic entities from mixture of salt,phenol & phenylamine? Thanks!

**Chemistry**

How is solvent extraction by ether used to separate organic entities from mixture of salt,phenol & phenylamine? Thanks!

**math**

if two squares have the same area of 2500 meters squared,when combined what is the perimeter?

**math**

Thank you very kind sir/ma'am you were a big help.

**math**

Step by step is what I meant.

**math**

That is what I don't get.Please can you show me how to do it.

**math**

How to solve for x.(i am terrible at this)

**math**

How do you that rbowh? I am really bad at this.(step by step please)

**math **

A math contest consists of ten problems.Three points are given for each correct answer. One point is deducted for each incorrect answer. Andy answers all the problems and scores 18 points. How many correct answers does he have?

**Math**

15-(12(divided by)2)+(-3x4)

**Chemistry**

Consider the salt FeSO4.7H20. What quantity in grams of salt could be produced from 1g of iron, assuming the overall reaction yield is 75% ? :) Thanks in advance!

**Chemistry**

Describe how one would obtain the stated pure product from the following mixtures and assume that this cannot be achieved simply by distillation of the original mixture: 1. benzoic acid from a mixture with ammonium benzoate 2. phenylamine from a mixture with nitrobenzene, HCl ...

**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.

**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 g...

**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)]

**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. Fi...

**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!

**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

**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

**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

**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?

**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 p...

**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) Fi...

**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 sale...

**Ms.Sue Help**

two numbers differ by 9.Four times the smaller is 5 more than twice the larger.Find the numbers.

**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

**Math**

Two numbers differ by 9. 4 times the smaller is 5 more then twice the larger. Find the numbers.

**calculus**

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

**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?

**math**

what is 4x+2=26,then 4x8=

**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!!!

**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?

**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

**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!!!

**math**

the shaded part isthe outside of the square. so how would i find that part?

**math**

the shaded part isthe outside of the square. so how would i find that part?

**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)

**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

**science**

Can you help me with an acrostic for science pertaing to plants

**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.

**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.

**Finite Math**

yeah you are right i just plug it in wrong , thanks soooo much!

**Finite Math**

didn't get it right, the answer in the book is 567.26

**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.

**Finite Math**

4403.80 is correct

**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.

**Finite Math**

yes thanks so much :D

**Finite Math**

Determine which is the better investment. 6.8% compounded semiannually or 6.6% compounded quarterly?

**Physics**

The back of the book says 227 km/h at 162.4 degrees

**Physics**

And your answer doesn't match the back of the book either.

**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

**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?

**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 ...

**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.

**Finite Math**

How long will it take $800 to earn $18 at 6% simple interest?

**Finite Math**

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

**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 :)

**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 :)

**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, "exce...

**math**

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

**math**

theres none

**math**

9/5xC)+32

**math**

theres none

**math**

what is 9/5x20)+32

**math**

what is expression 5 factorial equal

**math**

what is 85 nearest tenth

**math**

I need help with 40% equal x/30 what is x.

**math**

what is 3z-5+2z=25-5z

**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. Scienti...

**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 beli...

**english**

SO all I need to do is moreless add sentences together to make complete sentences?

**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. Scientis...

**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. Scientis...

**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 ...

**math**

a hiker travels for 15km on a bearing of 210T how far south is he please show working

**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" "F...

**Physics, help!**

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

**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! :)

**Math**

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

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