Wednesday

February 22, 2017
Total # Posts: 3,409

**chemistry**

When totally digested by acid and rocessed into a sample of one liter solution volume for spectroscopy, a 3.21 gram sample of alloy yeilded an absorbance of 0.288. Calculate the percent by wieght of iron in the alloy sample

*April 23, 2013*

**calculus**

Let A be the region in the plane consisting of those points (x,y) such that 0≤y≤1−x^2. Rotate A around the x-axis in space. What is the volume of the resulting solid?

*April 23, 2013*

**calculus**

Let f(x)=3x^2+x+3/2x+1. What is the derivative of f with respect to x

*April 22, 2013*

**calculus**

limx→4 4x^2−15x−4/x−4.

*April 21, 2013*

**Math**

a person deposited $500 in a savings account that pays 5% annual interest that is compounded yearly. at the end of 10 years, how much money will ve in the savings account?

*April 18, 2013*

**Managerial Accounting**

IRR: Even Cash Flows Williams and Park Accounting Practice is considering investing in a new computer system that costs $9,000 and would reduce processing costs by $2,000 a year for the next six years. Required: Calculate the internal rate of return, using the time value of ...

*April 13, 2013*

**Managerial Accounting**

IRR: Even Cash Flows Williams and Park Accounting Practice is considering investing in a new computer system that costs $9,000 and would reduce processing costs by $2,000 a year for the next six years. Required: Calculate the internal rate of return, using the time value of ...

*April 13, 2013*

**Managerial Accounting**

IRR: Even Cash Flows Williams and Park Accounting Practice is considering investing in a new computer system that costs $9,000 and would reduce processing costs by $2,000 a year for the next six years. Required: Calculate the internal rate of return, using the time value of ...

*April 13, 2013*

**Managerial Accounting**

Kim Johnson purchased an asset for $80,000. Annual operating cash inflows are expected to be $30,000 each year for four years. At the end of the life of the asset, Kim will not be able to sell the asset because it will have no salvage value. Required: What is the net present ...

*April 13, 2013*

**Chemistry**

A student in lab gathered temperature and concentration data for the solubility of borax and generated a plot of ln(Ksp) vs. 1/T having the equation of the line y = -11655x + 35.585. Determine the temperature (in units of K) at which the reaction becomes spontaneous.

*April 11, 2013*

**4th**

solve 1/2 + 17/35 =

*April 11, 2013*

**science**

If a population is not in genetic equilibrium, what must be occurring in the population

*April 10, 2013*

**POEM FOR MS.SUE**

Aww. That is sweet. Ms. Sue has helped me in the past, too. I am grateful for her.

*April 10, 2013*

**Math**

Try drawing it. Plot a point in the middle of three of the sides. It cuts the rectangle in half. The area that remains would be 18 square units. Now draw a line from the middle of the base of the triangle (the line cutting the rectangle in half) up to the point above it. You ...

*April 10, 2013*

**7th grade science**

Both parents can't be GG, because then all of the offspring would be GG. Both parents can't be gg, because then all of the offspring would be gg. You can't have one parent be GG and the other one be Gg, because some of the offspring would be GG. You can't have ...

*April 10, 2013*

**Trig**

Solve exactly over 0 ≤ θ < 2π secx + tanx = 1

*April 10, 2013*

**science**

Assuming that a population is mating randomly, no mutation or gene flow is occurring, calculate the frequencies of the two alleles for the five generations shown in the table below. Generaton #AA #Aa #aa p q Initial (P1) 42 46 12 0.65 0.35 F1 40 45 15 (?) (?) F2 38 49 13...

*April 10, 2013*

**accounting**

On April 25, 2010, Bullseye Company purchased all of the outstanding common stock of Vista Company, paying $14,000,000. The book values and fair values of Vista's assets and liabilities acquired are shown below in dollar amounts: Accounts Book Value Fair Value Accounts ...

*April 9, 2013*

**life orintation**

In 10-15 lines critically discuss 5 ways in which human or environmental problem on the community(water pollution)

*April 9, 2013*

**Science**

When 2 resistors, R1 and R2 are connected in series across a 6V battery the potential difference across R1 is 4V. When R1 and R2 are connected in parallel to the same battery the current through R2 is 0.45 A. Find the values of R1 and R2. Thanks :)

*April 8, 2013*

**grade12 life orintation**

which 5 ways you critically discuss how lifestyle disease/behaviour impact on the teenager (cancer)

*April 4, 2013*

**grade12 LO**

describe the lifestyle disease/behaviour of cancer and mention 5 factors that contribute to the disease/behaviour of cancer

*April 4, 2013*

**Chemistry**

How do you calculate the standard enthalpy change for the reaction of an aqueous solution of barium hydroxide, Ba(OH)2, with an aqueous solution of ammonium nitrate, NH4NO3, at 25 degrees C? The complete ionic equation is: Ba2+(aq) + 2OH-(aq) + 2NH4+(aq) + 2NO3-(aq) ---> ...

*April 2, 2013*

**college math**

An initial investment of $1000 is appreciated for 4 years in an account that earns 6% interest, 2) compounded semiannually. Find the amount of money in the account at the end of the period.

*March 31, 2013*

**CHEMISTRYY!**

@DrBob222 I worded the question exactly like they have asked it. What would be the equation for HNO3 with Sn? And how do you figure out these equations?

*March 31, 2013*

**CHEMISTRYY!**

Determine if HNO3 can dissolve in the following metal: 1) Write a balanced chemical reaction showing how the 2.09g Cu dissolves in HNO3. I had put down: Cu(s) + 4HNO3(aq) ——> Cu(NO3)2(aq) + 2NO2(g) + 2H2O(l) but it's wrong. 2) Determine the minimum volume of 6...

*March 31, 2013*

**math**

A family refers to a group of two or more people related by birth, marriage, or adoption who reside together. In 2000, in Country A, the average family net worth was $230,000, and there were about 7.2*10 to the seventh power families. Calculate the total of family net worth in...

*March 30, 2013*

**Math**

Seattle Chocolates for the year ended December 31, 2002: The following are selected items from the accounting records of Seattle Chocolates for the year ended December 31, 2002: Note payable to northwest Bank $500,000 Income taxes payable 40,000 Accrued expenses and payroll ...

*March 29, 2013*

**Math**

Harper Co. has outstanding $100 million of 5% bonds, due in 7 years, and callable at 102. The bonds were issued at par and are selling today at a market price of 92. If Harper Co. retires $10 million of these bonds by purchasing them from bondholders at current market price, ...

*March 29, 2013*

**math**

The Thompson Company uses standard costing and has established the following direct material and direct labor standards for each unit of Lept. Direct materials: 2 gallons at $4 per gallon Direct labor: 0.5 hours at $8 per hour During September, the company made 6,000 Lepts and...

*March 28, 2013*

**chem**

consider the system I2(g)+262 KJ ¡ê 2 I (g) at 1000¡ÆC. In which direction, if any, will the reaction proceed if gaseous iodine atoms are added, the system is compressed, the temperature is decreased, a catalyst is introduced, and gaseous idodine atoms ...

*March 27, 2013*

**Math**

Suppose you had d dollies in your bank account.you spent $12 but have at least $51 left.how much money did you have initially?write and solve an inequality that represents this situation.

*March 25, 2013*

**math**

A professor grades students on three tests, four quizzes, and a final examination. Each test counts as two quizzes and the final examination counts as two tests. Sara has test scores of 60, 80, and 89. Sara's quiz scores are 85, 94, 83, and 84. Her final examination score...

*March 24, 2013*

**Counseling**

are there in big differences in the ACA and NCDA codes of ethics?

*March 24, 2013*

**Math**

Im helping my son to find the area of a rectangle that is 7 3/8 inches and 4 inches the height. I need to know how to convert the fraction into a whole number.

*March 20, 2013*

**math**

How do you evaluate the following: Bill has two times as many coins as Tina.

*March 20, 2013*

**calculus**

I have spilled 200cm^3 of vegetable oil on my kitchen floor. The resulting oil slick can be modeled as a cylinder with a very small height; the height is decreasing at a rate of 1/1000πcm/sec and the radius is currently 50cm. How quickly is the radius of the oil slick ...

*March 16, 2013*

**calculus**

Consider the interval I=[6,7.6]. Break I into four subintervals of length 0.4, namely the four subintervals [6,6.4],[6.4,6.8],[6.8,7.2],[7.2,7.6]. Suppose that f(6)=19, f'(6)=0, f'(6.4)=−0.5, f'(6.8)=−0.1, and f'(7.2)=−0.1. What is the ...

*March 16, 2013*

**Chemistry**

For calculating the concentration of a metal Ion in Equilibrium with a complex ion...how do I get the right hand side of this equation to equal 5.9 E -8? x(0.98 + 2x)2 _____________ = 1.7 E 7 (0.010-x) then, x(0.98)2 ________ = 5.9 E -8 0.010 I understand that you cancel out ...

*March 16, 2013*

**calculus**

Consider the interval I=[6,7.6]. Break I into four subintervals of length 0.4, namely the four subintervals [6,6.4],[6.4,6.8],[6.8,7.2],[7.2,7.6]. Suppose that f(6)=19, f'(6)=0, f'(6.4)=−0.5, f'(6.8)=−0.1, and f'(7.2)=−0.1. What is the ...

*March 14, 2013*

**Language Arts**

Directions: Read the poem and answer the questions that follow. Fossil Flitting, flickering, flashing black, white, and a note of red passes beneath trees that were already old at the end of the Civil War. The lovely departed species announces its fearless refusal to cease to ...

*March 12, 2013*

**physics**

a kids marble rolls of a 63 cm tall table a a speed of 30 cm/s. How far from the based of the table will the ball land?

*March 12, 2013*

**math**

4 hours

*March 11, 2013*

**math**

its -2x+9

*March 11, 2013*

**math**

find the inverse of each function. is the inverse a function? 1) f(x)=-2x+9 2) f(x) x^2+2

*March 11, 2013*

**Maximum Area-Calculus-Edit**

THANK YOU SO MUCH! I got 250 for each dimension :)

*March 10, 2013*

**Maximum Area-Calculus-Edit**

We have 900 ft of fencing and we want to construct a back yard. If we are using the building as part of the barrier for the yard what are the dimensions that allow maximum area? I am not even sure how to start though I know I am supposed to calculate the derivative of the ...

*March 10, 2013*

**Maximum Area**

As the text drawing did not come out clear I hope this may clarify what I meant. imgur /F5NJVqp

*March 10, 2013*

**Maximum Area**

I do not think I made it clear sir. The part where I was stuck was where 100 ft. of the building is covered by the side of the yard. ___________________ | yard | | | -------------------- } building { ------------ the building length is 100 feet Sorry for any confusion this ...

*March 10, 2013*

**Maximum Area**

We have 900 ft of fencing and we want to construct a back yard. If we are using the building as part of the barrier for the yard what are the dimensions that allow maximum area? I am not even sure how to start though I know I am supposed to calculate the derivative of the ...

*March 10, 2013*

**Concavity-Calculus**

Determine the concavity for f(x)= 4/x^2-1 I took the second derivative and solved for zeros. I got x=-1 and x=1. However when plugged into the orig. equation this results in 4/0 (undefined). Does this mean there is no concavity?

*March 10, 2013*

**Calculus Derivative- Taylor Series?**

*look

*March 10, 2013*

**Calculus Derivative- Taylor Series?**

Yes I did get those as my derivatives. Thank you very much for your help Reiny. I did not know which patterns to look for. I think that it would be (-1)^n for the alternating neg. and pos.? Then n! for the factorial? And lastly x^ -(n+1) for the power of x in the denominator? ...

*March 10, 2013*

**Calculus Derivative- Taylor Series?**

let f(x)= x/x-1 find f'(x) f ''(x) and a formula for f ^ (n) * x. I found the first and second derivatives but do not know how to make a general equation for this. I have not learnt the Taylor or Maclaurin Series either. Thank you.

*March 10, 2013*

**math**

describe the transformation of y=log (x-4) -1 2 from the graph of y=log X. 2 then state the asymptote and the domain range.

*March 10, 2013*

**Chemistry**

How will the addition of sodium acetate to an acetic acid solution affect the pH? A. solution becomes hotter B. It will lower the pH C. It will raise the pH D. pH will not change E. pH cannot be measured I selected answer D and got it wrong. I don't understand why...

*March 10, 2013*

**math**

8^x+1=3

*March 10, 2013*

**math**

log(3x+1)=2

*March 10, 2013*

**math**

write a polynomial function in standard form with the given zeros. 1-2i,2

*March 10, 2013*

**math**

solve each equation 1) log5-log2x=1 2) 2log(x+1)=5

*March 10, 2013*

**math**

describe the transformation of y=8^x+2 from the graph of y=8^x then state the asymptote and domain and range.

*March 9, 2013*

**calculus**

Let f(x)=e^(x2). By the Mean Value Theorem, there exists a point c such that f′(c)=f(6)−f(4)6−4 with c between 4 and 6. Approximate c to within two decimal places; we're asking you to approximate c, because you can't "solve" for c.

*March 9, 2013*

**calculus**

its cubed

*March 9, 2013*

**calculus**

Use a linear approximation of f(x)=^3√x at x=8 to approximate ^3√7. Express your answer as an exact fraction.

*March 9, 2013*

**math**

Einsteins famous formula E=mc^2 relates energy E,mass m and the speed of light c. solve the formula for c.

*March 9, 2013*

**calculus**

Use the Euler Method with a step size of 0.2 to estimate f(3) where f′(x)=2x−7 and f(2)=4. Your answer should be correct to two decimal places.

*March 9, 2013*

**calculus**

Use a linear approximation of f(x)=log(x) at x=1 to approximate log(3/4). Express your answer as an exact fraction; remember that log denotes the natural log.

*March 9, 2013*

**math**

At a football game, a vender sold a combined total 210 of sodas and hot dogs. The number of sodas sold was 44 more than the number of hot dogs sold. Find the number of sodas sold and the number of hot dogs sold.

*March 8, 2013*

**Chemistry**

At a certain temperature, the equilibrium constant, Kc, for this reaction is 53.3. H2(g)+I2(g) <--> 2HI(g) Kc= 53.3 At this temperature, 0.300 mol of H2 and 0.300 mol of I2 were placed in a 1.00-L container to react. What concentration of HI is present at equilibrium? HI...

*March 8, 2013*

**physics**

A car with a weight of 5000.0 N is accelerated across a level surface at 2.5 m/s^2. What is the net force acts on the wagon? (g= 9.81 m/s^2)

*March 6, 2013*

**College Mathematics**

write the statement in symbolic form. Let p: the temperature is 90 degrees Let q: The air conditioner is working r: the apartment is hot. If the apartment is hot and the air conditioning is working, then the tempurature is 90 degrees.

*March 6, 2013*

**Chemistry 101**

2HCl(aq)+K2SO3(aq)➡️2KCl(aq)+SO2(g)+H2O(l) Is is a gas evolution reaction:)

*March 5, 2013*

**College Mathematics**

write the statement in symbolic form. Let p: The Temperatue is 90 degrees Let q: The air conditioner is working Let r: If the apartment is hot and the air conditioner is working, then the temperature is 90 degrees.

*March 5, 2013*

**College Mathematics**

write the statement in symbolic form. Let p: The Temperatue is 90 degrees Let q: The air conditioner is working Let r: If the apartment is hot and the air conditioner is working, then the temperature is 90 degrees.

*March 5, 2013*

**College Mathematics**

Construct a truth table for the statement (p<--->q)--->p

*March 5, 2013*

**math**

hi i wanted to know what is 1.8387 rounded three decimal places please im stuck

*March 4, 2013*

**calculus**

A cylindrical container is to hold 20π cm^3. The top and bottom are made of a material that costs $0.40 per cm^2. The material for the curved side costs $0.32 per cm^2. Find the height in centimeters of the most economical container.

*March 2, 2013*

**calculus**

Suppose you have 400 meters of fencing and you wish to enclose a rectangular space with two parallel partitions: What is the maximum total area of the enclosed space, in square meters?

*March 2, 2013*

**math**

Miss Ramirez has invested $6,000 at 5%. How much additional money must she invest at 8% so that her annual income from the two investments will be 6% of the total amount invested?

*March 2, 2013*

**AP Chem**

Is that because it's a solid and not a gas?

*February 26, 2013*

**AP Chem**

For the following equilibrium system, which of the following changes will form more CaCO3? CO2(g) + Ca(OH)2(s) <--> CaCO3(s) + H2O(l) deltaH(rxn) = -113 kJ My choices are: a) Decrease temperature at a constant pressure (no phase change) B) Increase volume at a constant ...

*February 26, 2013*

**6th grade math**

n/4+32=72 (sub. 32) n/4=40 (multiply by 4) n=160

*February 26, 2013*

**6th grade math**

Multiply both sides by 4

*February 26, 2013*

**Chem Help!!!!**

I balanced the equation and got 2Cr+3O2->2CrO3.. but I was informed that this is the incorrect answer

*February 25, 2013*

**Chem Help!!!!**

In an experiment, 0.771g Cr(s)reacts completely with 0.712g O2 to form a single solid compound. Write a balanced equation

*February 25, 2013*

**Chemistry Help!!!!!**

How many milliliters of 0.635M K2CrO4 are needed to precipitate all the silver in 410mL of 0.158M AgNO3 as AgCrO4 ?

*February 25, 2013*

**calculus**

At noon, you and I start at the same place, and then you head east at a speed of 5 kilometers per hour, and I head north at a speed of 4 kilometers per hour. After two hours, how fast are we moving apart, in kilometers per hour?

*February 23, 2013*

**Microeconomics**

Thanks, Anonymous...Although I understand the concept I need to actually see the formula. I am a visual kindda person.

*February 23, 2013*

**Microeconomics**

If fixed cost is $8,000, variable cost is $5,000 at an output of 2 and $9,000 at an output of 3, how much is marginal cost at an output of 3? Can someone show me how to do the formula step by step?

*February 23, 2013*

**reading**

Fill in the blank 1-2. Although Jenny chose the songs from her __ that she knew best, she wasn't complacent about being prepared. Afraid she would __ the night of the concert, she practiced the songs over and over. 3-4. The __ of the lecture was that although the United ...

*February 20, 2013*

**Intermediate reading**

Is this a correct sentence? The gist of the lecture was that although the United States encourages free trade, some other countries falter it

*February 20, 2013*

**Math help**

the answer is 40 years. Hope this helps

*February 20, 2013*

**Reading**

1. repertoire 2. hamper 3. gist 4. falter 5. variable 6. conducive 7. frenzy 8. paradox 9. bizarre 10. flaunt

*February 20, 2013*

**Reading**

Can you help me with the following sentences? 1-2. Although Jenny chose the songs from her __ that she knew best, she wasn't complacent about being prepared. Afraid she would __ the night of the concert, she practiced the song over and over. 3-4. The __ of the lecture was ...

*February 20, 2013*

**math**

Thank you c:

*February 20, 2013*

**math**

oh because i thought it was a negative and a positive so they cancel out but its 7x^2-6x-6? or...?

*February 20, 2013*

**math**

so would it be 7x^2-6??

*February 20, 2013*

**math**

what is the sum of (x^2-3x+2) and (5x^2-3x-8)? how would you solve this???? please help

*February 20, 2013*

**Chemistry**

Thank you

*February 20, 2013*

**Chemistry**

A thoroughly dried 1.281g sample of Na2SO4 is exposed to the atmosphere and found to gain 0.383g in mass. What is the percent, by mass, of Na2SO4*10 H2O in the resulting mixture of anhydrous Na2SO4 and the decahydrate

*February 20, 2013*