# Posts by Joe

Total # Posts: 2,615

**math**

Jen,amy,linda,max and jenny are compteting to fill two remaining spots on the chess team. How mant different combinations are possible for filling the two spots? 120,60,20,or 10

**math**

Tom received 90 votes in the student council election. That was 30% of the total votes cast. How many votes were in the election? 200 270 300 360

**Calculus**

given y=sec(x^2)ln(2x^5) find dy/dx

**Calculus**

find f'(x) f(x)=(3x^2-4)^5 / √2x-1

**Calculus**

find f'(x) f(x)=cos(2x)tan(2x)/2√x

**Calculus**

find f'(x) f(x)=x^5lnx

**Calculus**

find f'(x) f(x)= sin(3x)/2x^2-4

**Chemistry**

The example I was referring to was acetic acid.

**Chemistry**

There exists a correlation between maximum electrostatic potential and acid strength. As pKa decreases (acid strength increases), the maximum electrostatic potential for a molecule increases. Given a particular acid, is there any way to determine the maximum electrostatic ...

**Art**

What are the differences between film and popular cinema?

**Chemistry**

What range of values for electrostatic potential is characteristic of strong acids? What range is characteristic of weak acids? Why is there a correlation between electrostatic potential and acid strength?

**english**

please give me a good thesis statement on the topic "Aids in Africa"

**math**

How many times does each digit (0 through 9) appear in a list of counting numbers from 1 to 100 inclusive?

**Finance**

The dividend yield is 5.7%

**intermediate algebra**

where did you get the 750? I have a similar problem here: a farmer wants to build a rectangular pen using a side of a barn and 60ft of fence. find the dimensions and area of the largest such pen

**math**

A total of four students belong to all three teams, the baseball, basketball and football team. These four students represent 10% of the baseball team, 25% of the basketball team and 8 1/3 % of the football team. There are 20 students who are just on two teams. What percent of...

**math**

Find the smallest positive whole number with exactly ten positive factors and list the factors.

**math**

Friendly's Clothing Store bought handkerchiefs, six for $10, and sold them 4 for $10. They made $60 profit. How many handkerchiefs did they sell?

**math**

Find the four-digit number described by these three clues. 1) The first digit is one-third of the third digit. 2) The fourth digit is twice the second digit. 3) The first and third digits add up to twice the sum of the second and fourth digits.

**Physics**

There are two particles of charge +Q located on the top left and bottom right corners of a square. What is the direction of the net electric field at the point on the bottom left corner of the square? And also what would be the general equation be for finding the potential ...

**physics**

There are two conducting spheres of different sizes, both with the same negative charge. If they are connected with a conducting wire, the charge would therefore flow from the smaller to the larger. Am I correct? Thanks!

**physics**

If there are two conducting spheres of different sizes, but of a same negative charge and they are connected with a conducting wire, does the charge flow from one sphere to the other?

**English**

Thank you.

**English**

What is the difference in academic papers and memos? How does it affect the tone and structure of the two papers? Im stuggling with this assignment. Please help.

**statistics**

Assume that Acme Tires sells their high performance tires for $180 each and their all weather tires for $135 each. Further assume that the cost of producing a high performance tire is $150 and the cost of producing an all weather tire is $120. Finally, assume that if a tire ...

**statistics**

What is the expected value (expected profit) of producing an all weather tire?

**math**

how do u do two step equations

**Chemistry**

Balance the following equation: C6H5COOH + O2 ==> H2O + CO2

**chemistry**

Phosphoric acid and barium hydroxide solutions mix to form water and solid barium phosphate. Write the word equation, skeletal equation, and the balanced equation for this word problem.

**chemistry**

for the second part do i subtract 100-75 = 25 = -(the constant)(time)

**chemistry**

So its Ln ( 50/100) = k (34 min)?

**chemistry**

A reaction is 50% complete in 34.0 min. 1.) How long after its start will the reaction be 75% complete if it is first order? 2.)How long after its start will the reaction be 75% complete if it is zero order? steps would be helpful

**Math - Algebra**

This is a fraction algebra. n/24=25 (not divide sign). I don't know if I have to multifly and which number do i use.

**chemistry**

Do I use the t(1/2) = ln2 / K formula? In that case...would I just substitute any of the data that I want? Like t(1/2) = 0.715, ln2, then find k?

**chemistry**

For the reaction A to products}, the following data were obtained: t=0 s, A}]=0.715 M; 22 s, 0.605 M; 74 s, 0.345 M; 132 s, 0.055 M. What is the half-life of the reaction? ive been posting this for awhile now...can someone just show me how to go about doing this problem? i ...

**chemistry**

For the reaction A to products}, the following data were obtained: t=0 s, A}]=0.715 M; 22 s, 0.605 M; 74 s, 0.345 M; 132 s, 0.055 M. What is the half-life of the reaction?

**chemistry**

For the reaction A to products}, the following data were obtained: t=0 s, A}]=0.715 M; 22 s, 0.605 M; 74 s, 0.345 M; 132 s, 0.055 M. What is the half-life of the reaction?

**chemistry**

for this one do i just plug in k A^2B^0 = rate?

**chemistry**

The reaction A + B to C + D is second order in A and zero order in B. The value of k is 1.10×10−2 M^{-1}\;min^{-1}. What is the rate of this reaction when A}]=0.124 M and B}]=3.89 M?

**Chem- follow up question**

Sorry i posted this as an answer after my question had been answered, this is continued from the qualitative analysis question: That reallly cleared some things up, but I do still have a few questions. Umm im not completely clear on the hyrogen peroxide subject. its added to a...

**Chemistry**

That reallly cleared some things up, but I do still have a few questions. Umm im not completely clear on the hyrogen peroxide subject. its added to a solution containing aluminum chloride and iron chloride, and you said it is ther eto make sure the ion is Al3+, can you please ...

**Chemistry**

HI, we conducted a qualitative analysis, to identify the cations in an unknown sollution..trying to determine whether it had Al 3+, Fe (3), and Lead ions..i am having trouble understanding some parts of the procedure. before testing for aluminum and iron, hydrogen peroxide was...

**chemistry**

For the reaction A to products}, the following data were obtained: t=0 s, A}]=0.715 M; 22 s, 0.605 M; 74 s, 0.345 M; 132 s, 0.055 M. What is the half-life of the reaction?

**chemistry**

The reaction A + B to C + D is second order in A and zero order in B. The value of k is 1.10×10−2 M^{-1}\;min^{-1}. What is the rate of this reaction when A}]=0.124 M and B}]=3.89 M?

**chemistry**

The reaction A to products is first order in A. 1.) If 2.00 g A is allowed to decompose for 42 min, the mass of A remaining undecomposed is found to be 0.50 g. What is the half-life, t_{1/2}, of this reaction? 2.)Starting with 2.00 g A, what is the mass of A remaining ...

**Art**

Does anyone know what the difference between analytical and expressive lines are and where I can find some art examples of each?

**physics**

0.490 mol of argon gas is admitted to an evacuated 50.0 cm^3 container at 60.0 C. The gas then undergoes an isochoric heating to a temperature of 400 C. What is the pressure?

**Accounting**

Given the data, would you have invested in Quality Department Store in 2006? Explain why or why not. Summarize your analysis of the financial data to support your reasoning. What recommendations would you make to improve the financial health of this company? Explain why.

**physics**

If 2.0J of work is done in raising a 180g apple, how far is it lifted?

**Crt/205 Critical Thinking**

I need help with this assignment: Argument Evaluation DUE: Day 7 Points: 100 · Read the essay “Bush’s Environmental Record” by Bob Herbert found in the “Appendix 1”, pgs. 461-462. To find this, click on the “Controlling Irrational Fears ...

**algebra**

5 yrs ago Montys age was 5 years less than twice Rachels age. In 3 years, one third of Rachels age will be 12 years less than Montys age. How old are they now?

**math**

No - that comes out to a negative number - doesnt it? Can you show the next steps?? I am not sure why it is not coming out -

**math**

5 yrs ago Montys age was 5 years less than twice Rachels age. In 3 years, one third of Rachels age will be 12 years less than Montys age. How old are they now?

**science**

it has less density

**Math**

The week before a big concert, five friends (Alvin, Bert, Chip, Dennis, and Ethan) stood in line to buy tickets. There were other people between them, but the five friends were in line in the order listed above. The line was really long, and they were pretty bored. Chip ...

**math**

5 Hundredths.

**Health**

Which one of the following subcategories of the E/M section has separate codes for new and established patients? A. Office or Other Outpatient Services B. Hospital Observation Services C. Initial Inpatient Consultation D. Emergency Department Services

**7th grade essay writing**

What's with the stupid mama joke?

**Physics**

The acceleration due to gravity on planet X is one fifth that on the surface of the earth. If it takes 3.9 s for an object to fall a certain distance from rest on earth, how long would it take to fall the same distance on planet X?

**chem**

That's the problem, I have to make a diagram using only the data made available to me, and I have no idea how to make use of the critical point to solve this. If 179 is indeed equilvalent to 1 atm or 760 mm Hg, i can conclude that at 125 degrees its 0.1-0.9 atm, i just don...

**chem**

Benzaldehyde, C6H5CHO}, has a normal boiling point of 179.0 C and a critical point at 422 C and 45.9 atm. Using a phase diagram, estimate its vapor pressure at 125 Degrees I'm directing it up again to Dr. Bob. (or anyone else who can help) **** If the boiling point (179) ...

**chemistry**

that was me who posted the comment above. my friend had the same question.

**chemistry**

1.) How much ethanol, C2H5OH, in liters (d=0.789g/ml) must be dissolved in water to produce 190.5 of 1.65 M C2H5OH? (Molarity problem.) 2.) How much concentrated hydrochloric acid solution (36.0% HCl by mass, d = 1.18g/mL}), in milliliters, is required to produce 11.0 L of 0....

**english**

I'm black,approx. 6" square,I have a hole in the middle ,and my sides go round and round

**History-PLEASE HELP**

Thank you soooo much!!

**History-PLEASE HELP**

I am stuck on a homework assignment and am having a hard time finding information on this topic. Can someone please please help!! Why is Kenneth Clark’s interpretation of the African mask ethnocentric?

**math**

ok, I realize that I should cut each remaining square into 9 quadrants leaving the middle open of each of them. Now, I just don't know how to get the percent of the original square that remains in stage 3.

**math**

Hello, Here is a question with something i've never heard of. These are the first two stages of a fractal known as the Sierpinski carpet. The carpet begins with a square (stage 1). The square is cut into 9 congruent squares and the middle square is removed (stage 2). Draw ...

**MATH**

On the xy-coordinate plane, point O is the origin. Suppose vector OE=(3,8) and vector OF=(-2,-4). What ordered pair represents vector EF? I tried graphing them but they don't even end up in the same quadrant. Not sure what to do..

**MATH**

Oh, so you had to find a pattern... Thanks

**MATH**

Hello, This figure shows the number of segments used to form longer and longer rows of squares. It shows that 1 square has 4 segments 2 squars has 7 segments and 3 squares has 10 segments. The question is how many segments will be in a row with 100 squares? Thought maybe a ...

**Math**

Oh thanks!

**Math**

For 5 consecutive days, the price of a lamp in jill's store is reduced by 10% from the previous day's price. At the end of the fifth day, by what percetage will the price of the lamp have been reduced from its initial price? I'm not sure where to begin since I don...

**MATH**

Hello I have to draw a pentagon with 30 square units on graph paper. My question is how can I get 30 square units if the slanted sides are not full squares?

**math repost Please Help!**

Hello, In a class of 24 students, every student flips fairly two coins 40 times each and records the results. Assume that the class obtained the expected results when they conducted the experiment. a. Make a bar graph illustrating the combined class results b. explain why an ...

**Math**

Patricia's teacher asked her to find the perimeter of the school's rectangular parking lot. After school, patricia walks along the short side of the lot and finds it is 50 yards long. She then walks diagonally from one corner of the rectangle to the other and throught ...

**math**

Ok you have to write a system of equations. x+y=40 2x+4y=100 y=40-x 2x+4(40-x)=100 solve: X=30 Y=10 then 30+y = 40 y=10

**MATH**

Hello, In a class of 24 students, every student flips fairly two coins 40 times each and records the results. Assume that the class obtained the expected results when they conducted the experiment. a. Make a bar graph illustrating the combined class results b. explain why an ...

**algebra**

Jennifer is twice as old as Ramon. The sum of their ages 7 years ago was 13. How old are they now?

**math**

Hello, A ship's movements are being tracked on a radar screen. The ship is first seen on point a with coordinates (-5,8) 1. It moves along vector AB represented by the ordered pair (-6,-1) 2. Then it travels along vector BC represented by the ordered pair (4,-3) 3. Finally...

**Math**

Ok, thanks. But how did you get 12 and 5?

**Math**

Hello, I'm not sure how to go about this question. To get to work on the first day, Jose has the following directions. Travel 15 miles due East. Turn right and travel 12 miles due south. Turn right again and travel 10 miles due West. If Jose could travel in a straight line...

**Math**

ahh, so simple in hind sight

**Math**

Hello, I can't find a pattern to answer this question, can you help? The beginning of the fibonacci number sequence is listed below: 1,1,2,3,5,8,13,...... What is the smallest term in the sequence which has a value greater than 100?

**physics**

45

**physics**

PE=(13/3)k(Q^2)/a

**Math**

Solve by the elimination method. 2r-5s = -11 5r + 2s = 16

**Math**

Find the indicated outputs for f(x)= 5x^2-5x. F(0) = 0 f(-1)= 1 f(2)= 45 is this right?

**Elimination Method...**

Solve by eliminatin method. 2r-5s= -11 5r+2s= 16

**equal group riddles**

i am a number between 20 and 30.when you put me into 6 equal groups;there is an even number in each group and 1 is left over.what number am i

**Finance**

2142

**math**

In how many ways can 7 basketball players of different heights line up in a single row so that no player is standing between 2 people taller than she is?

**chemistry**

22%

**Algebra**

69

**Math-Fractions**

How would I solve these two problems. (We have to simplify our answer) 5/7 divided by 8/21 12/7 divided by 9/21

**Elementary Math**

On a number where would 4/3 go? Would it go one third the way between 3 and 4? Where would 5/3 go?

**Molarity**

Determine the molarity and normality of a solution prepared by dissolving 55 mg of sodium bicarbonate (NaHCO3) in 750 mL of water.

**Precal**

use graphic techiques in radians I found that it is roughly equal to -.5 sin [ 20.42036^-1(x + 40.84071)pi ] + 1

**Precal**

I do not understand how to do this problem ((sin^3 A + cos^3 A)/(sin A + cos A) ) = 1 - sin A cos A note that all the trig terms are closed right after there A's example sin A cos A = sin (A) cos (A) I wrote it out like this 0 = - sin^6 A - cos^6 A + 2sin^3 A cos^3 A - ...

**Physics**

I'm having some trouble with this question A 4200-kg rocket is traveling in outer space with a velocity of 120m/s toward the Sun. It needs to alter its course by 23 degrees, which can be done by shooting is rockets briefly in a direction perpendicular to it’s original...