# 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?

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

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

Thank you soooo much!!

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?

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...

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