Monday

August 3, 2015

August 3, 2015

Total # Posts: 3,149

**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*

**Pre Cal**

Sec^2 2u-1/Sec^2 2u = Sin^2 2u
*February 19, 2013*

**MaTH**

the perpendicular line is -2 the parallel line is 3/2
*February 18, 2013*

**Chemistry**

A 62g piece of ice at 0 degrees celcius is added to a sample of water at 9 degrees celcius. All of the ice melts and the temperature of the water decreases to 0 degrees celcius. How many grams of water were in the sample
*February 17, 2013*

**English**

Are there cultures that should not be promoted in the early childhood education setting? Why or why not? Support your position.
*February 16, 2013*

**algebra**

Can you please help me with this problem? -7x-4x-5=9x
*February 14, 2013*

**math**

if the ratio of boys to girls is 3/4 and there are 49 students how many boys are there?
*February 14, 2013*

**Reading**

ok thanks
*February 13, 2013*

**Reading**

Is the correct answers 4. empathy 6. complacent 9. diligent 10. transcend
*February 13, 2013*

**Reading**

Is this the correct word for each sentence 1-2. Lynn begged the bank to __ the overdraft charge of thirty dollars, telling them that it would entirely __ her savings. 3-4. In high school, Julio was voted "Most Likely to Become a Psychologist." It was the __ of his ...
*February 13, 2013*

**Chem Help!!!!!**

Ha! I just saw your comment... I am indeed are you in his class or you've taken him before, Donovan?
*February 11, 2013*

**Chem Help!!!!!**

The angle iron pictured here is made of steel with a density of 7.78g/cm^3. (Figure 1) measurements are: 12.78cm 10.26cm 1.35cm 2.75cm 1.35cm
*February 11, 2013*

**College Physics 2**

A parallel-plate air capacitor is made from two plates 0.250 m square, spaced 0.70 cm apart. It is connected to a 140 V battery. a) What is the capacitance? C = 7.90×10−11 F b) What is the charge on each plate? Enter your answer as an absolute value of charge. Q = ...
*February 11, 2013*

**accounting**

Suppose that two years after the bonds were issued, the required interest rate fell to 7 percent. What would be the bonds’ value?
*February 11, 2013*

**business**

In portfolio analysis, the goal when purchasing leverage items is
*February 10, 2013*

**algebra**

8/3fg^2
*February 10, 2013*

**Chemistry**

I read this question wrong and posted it wrong...it should be which is incorrect? If this is the case shouldn't C be the correct one?
*February 10, 2013*

**Chemistry**

Consider the following equilibrium: NH4Cl(s)--->NH3(g) + HCl(g) Suppose a vessel containing NH4Cl(s), NH3(g) and HCl(g) is at equilibrium. If the volume of vessel is instantaneously doubled while keeping the temp constant when a new equilibrium is reacted, which of the ...
*February 10, 2013*

**Math**

x+ .76x =1.76x Or 1x+.76x=1.76x
*February 10, 2013*

**Math**

.76(.0200-x)=x .0152-.76x=x +.76x +.76x (x add to .76x = 1.76x) .0152=1.76x (divide by 1.76 to solve for x)
*February 10, 2013*

**math**

6x=-36 /6 /6 x =-6
*February 9, 2013*

**CHEM**

How many grams of magnesium chloride are needed to prepare 100ml of a 0.325 M MgCl2 solution?
*February 7, 2013*

**CHEM**

What is the molarity of potassium iodide solution prepared by adding 5.810g of KI to sufficient water to make a final solution volume of 250.0mL?
*February 7, 2013*

**CHEM**

What is the molarity of a calcium sulfate solution prepared by adding 27.89g of CaSo4 to sufficient water to make a final solution volume of 1.00L?
*February 7, 2013*

**CHEM**

How many grams of sodium chloride are required to prepare 1.00 liter of a 1.00M NaCl solution?
*February 7, 2013*

**math**

9*12=108 W+(w+44)=108 2w=64 W=32. -white roses
*February 7, 2013*

**math**

X+y=54 5x+20y=780 -5(x+y=54) -5x-5y=-270 5x+20y=780 15y=510 Y=34 X=20 5(20)+20(34)=780 Five dollars bills = 20
*February 7, 2013*

**Algebra 1- Math**

2x-3y =-3 -1(3x-3y=18) 2x-3y=-3 + -3x+3y=-18 (add two equations) -x = -21 x = 21 2(21)-3y =-3 42-3y=-3 -3y=-45 y=15
*February 7, 2013*

**math**

A man sells a nut mixture consisting of 1/3 pecans and 2/3 cashews. Pecans cost 3 times as much as cashews. if a pund of the mixture costs him $0.40, how much did he pay for a pond of cashews? a pound of pecans?
*February 7, 2013*

**Physics**

In a baseball a pitcher can accelerate a .15kg ball from rest to 98 mi/h in a distance of 1.7m a) what is the average force exerted on a ball during a pitch? b)If the mass of the ball is increased, is the force required of the pitcher increased, decreased or unchanged?
*February 7, 2013*

**MATH**

7s-5s+10<30 -10 -10 7s-5s < 20 2s < 20 \2. \2 S. < 10
*February 6, 2013*

**Math**

Tom spent 1/3 of his allowance at mall. Of the money he spent at the mall, he spent 3/5 of it on jeans. What fractions of his allowance did Tom spend on jeans?
*February 6, 2013*

**Algebra**

W(w+4)=77 W^2 + 4w - 77 = 0 (W-7)(w+11)=0 W-7=0 W=7 W+11=0 gives neg. ans. Length = 7+4=11 Width = 4
*February 6, 2013*

**physics**

a mass m=8 kg sits on top of an h=1.8 m high table. The angle of the ramp is theta= 35 degrees. What is the length of the ramp.
*February 5, 2013*

**Reading( Immediate)**

Thanks
*February 4, 2013*

**Reading( Immediate)**

Do you have a copy of the sentence check 2 questions for chapter 20 in the 4th edition of Improving Vocabulary Skill book by Sherrie L. Nist?
*February 4, 2013*

**CHem Help!!!!**

What Celsius temperature will the Fahrenheit thermometer be 4-times more than on the Celsius thermometer?
*February 4, 2013*

**Chem Help!!!!**

I just need a solution to the first half of the question I figured out the 2nd half
*February 4, 2013*