Friday
April 18, 2014

# Posts by Devon

Total # Posts: 152

math
25 over 100 = n/100 how do i solve for n?

Math
convert the number to scientific notation. .0000000009

Math
Multiply (4r+4)(4r-4)

math
In the set of numbers 2,3,5,7,7,8,10 what is a) the arithmatic mean b) the harmonic mean c) geometric mean

math
A fitness company surveyed the weights of its 90 costumers. Assume that the weights are normally distrubted with a mean of 162 lbs and a standard deviation of 3.5 lbs. If you select one of its costumers randomly, what is the probability that the costumer's weight is a) mor...

math
A fitness company surveyed the weights of its 90 costumers. Assume that the weights are normally distrubted with a mean of 162 lbs and a standard deviation of 3.5 lbs. If you select one of its costumers randomly, what is the probability that the costumer's weight is a) mor...

math
A class of 43 students took an exam. Their mean grade average is 67 and standard deviation is 7. a) how many students should get a C? b) how many should get a B? c) what score is necessary to get an A?

math
9 -2 1/5

Histories/Social Studies
The Rule of Wang Mang!

math
TWO WORKERS CAN MAKE TWO CHAIRS IN TWO DAYS HOW MANY CHAIRS CAN 8 WORKERS WORKING AT THE SAME RATE MAKE IN TWO DAYS?

Math
What is the answear to add. 5. 5/8 7. 2/3 19. 3/4

Math
A projectile is fired with an initial velocity of 350 feet per second at an angle of 45° with the horizontal. To the nearest foot, find the maximum altitude of the projectile. The parametric equations for the path of the projectile are x = (350 cos 45°)t, and y = (350 ...

math
For the vectors u=(2,-3) and w=(-1,2), calculate |-3u| - |2w|.

pre-calc
A ship travels 200km west from port and then 240km due south before it is disabled. Illustrate this in a vector diagram. Usa trigonometry to find the course that a rescue ship must take from port in order to reach the disabled ship. i dont know where to begin, could someone ju...

Economics
A person must decide whether or not to proceed with a particular investment project. If the project succeeds, She will gain \$15 million. If the project fails, she will lose \$3 million. She estimates there is a 20% chance that the project will succeed and an 80% chance it will ...

Economics
A person must decide whether or not to proceed with a particular investment project. If the project succeeds, She will gain \$15 million. If the project fails, she will lose \$3 million. She estimates there is a 20% chance that the project will succeed and an 80% chance it will ...

precalc
thank you!

precalc
simplify: (x^-2 - y^-2) / (x^-1 - y^-1) i know you have to get rid of the negative powers, but i cant figure out how, any help?

pre calc
sketch the graph y=abs(x)+2 then sketch over the y=x line.

research paper
i have to include these questions in my report, and i can't seem to find them anywhere, any help? What influences may China and India have on other Asian countries as their economies begin to emerge on the global scene? What benefits have American corporations and the Amer...

math
Solve (x - 3)(x – 4)/(x – 5)(x – 6)^2 >or= 0 any help?

math
thank you for both your help, i think i got it now!

math
solve the inequality: n^3-7n+6<0 it said to use the rational route theorem, but i dont quite understand how to use it. any help?

Science
How do i find the valence electron for Chlorine.

Physical science
In my tenth-grade-level physical science class, we're studying heat, and I completely don't get it. I'll read the definition for specific heat over and over, and I still don't understand it. "For all substances, specific heat is a characteristic physical p...

math

math
Subtract one from each side, like bobpursley said. r<or=(-1)

Simple machines: physic science
What was your idea? And please, elaborate some. Were those all of your guidelines? What are the exacts?

math
i dont really know how to go about anwsering this problem: the weight of the eggs produced by a certain breed of hen is Normally distributed with mean 65 grams and standard deviation 5 grams. think of cartons of such eggs as SRSs of size 12 from the population of all eggs. wha...

math
thank you so much!

math
A study to determine whether or not a football filled with helium traveled farther when kicked than one filled with air found that while the football filled with helium went, on average, farther than the one filled with air, the difference was not statistically significant. Th...

Statistics
Standard Normanl Drill: A. Find the number z such that the proportion of observations that are less than z in a standard Normal distribution is 0.8. B. Find the number z such that 35% of all observations from a standard Normal distribution are greater than z. i have now idea w...

Biology
Why do you suppose AIDS has infected people across the entire planet, and Ebola "retreats"?

science/chemistry
thank you! What is the molar concentration of hydroxide ions in a solution with a pH of 6? Find the concentration of H ions first.. [H+]= antilog -ph Then, find [OH-] [OH-]= 1*10^-14/[H+]

Writing
I have to write a page on my take about Oprah Winfrey speech at Howard university. Where can i find a transcript of her speech at Howard? I've looked at www.oprah.com, www.howard.edu, and searched www.google.com, but all I find are excerpts. The entire transcript may not b...

trig...again
gahh i cant figure this one out either. you have you verify the identity only using one side of the equation: sec^2x*sin^2x+sec^2x=-1 this identity cannot possible be true. on the left side you are adding 2 squared quantities, how can that result be negative? Check your typing...

trig
it says to verify the following identity, working only on one side: cotx+tanx=cscx*secx Work the left side. cot x + tan x = cos x/sin x + sin x/cos x = (cos^2 x +sin^2x)/(sin x cos x) = 1/(sin x cos x) = 1/sin x * 1/cos x You're almost there. thanks so much! i could not fi...

trig
it says solve for all real solutions, compute inverse functions to 4 sigfigs. cos^2x=3-5cosx Devon, what grade level are these questions from? I am having the same problems as with your 9:14 post. Please see my partial solution in the post to bobpursely at 10:54 Devon, I have ...

trig
find the exact solutions 2cos^2x+3sinx=0 the way it stands, that is a "nasty" question. Are you sure the second term isn't 2sin(2x) ? no, its as i wrote it. then it's got me stymied, I must be missing something rather obvious, sorry! thanks for trying! 2cos^2...

trig
find the exact solutions (¦È in degrees) sin^2¦È+2cos¦È=-2 range= 0¡Ü¦È<360¡ã see the other problem, same procedure.

trig
find the exact solutions (è in degrees) sin^2è+2cosè=-2 change the sin^2 to 1-cos^2, then rearrage the equation into quadratic form, use the quadratic equaion.

(Life)
What is a good conflict resolution technique for employees? Talk together. Work it out. Compromise. If you cannot do this, consult your employer. Are you talking about conflict resolution among employees or between employees and employers? Elizabeth's suggestion are good a...

Chemistry
How do i balance this equation? Al+N2---->AlN 2Al + N2 ----> 2AlN

Algebra 2
What is the determinant of -2 -3 5 0 15 How you get 15 Use the definition of a determinant. From the first column you take take the element that is in the position of a permutation of 1, from the second you take the element that is in the position given by the permutation of 2...

Chemistry
Hydrogen boils at 20K. What is the boiling point of hydrogen on the Celsius scale? K is 273.15 degrees plus the celsius. so take 20(K) and minus 273.15 this would give your answer in celsius thanks.. One more question What is the volume of a board that measures 1.8 by 8.8cm by...

Science/Chemistry
How many electrons can occupy a single molecular orbital? and Alumimum is a group 3A metal, Which ion does A1 typically form? I'm thinking Al3+ Your first question depends on the molecule involved and how it is bonded. Hybrid molecular orbits can be formed. Now in an atom,...

Chemical Compounds
How can a flow chart help you to name chemical compounds? Some people like to memorize rules and use the analysis of compounds then to apply the rules. CAN YOU HELP ME!!

Writing/ New York Times
i just read in the Editorial Section of the New York Times about Uinted States Losing the Good War.. You know where i can find more information on this? Every where i look its the same exact article. Where is it written not the same way but talking about the same thing? go to ...

Math (Algebra)
A=1/2h(b+c) h=8=5 and c=2. What is the value of A What do you mean by h=8=5?? Given the formula A=1/2h(B+C) If H=8, B=5, And C=2, what is the value of A? If H=8 B=5 C=2, then first, you would do (B+C)= 7. Then convert 1/2 to 0.50 and multiply 0.50 by 8, and you should get 4. N...

Science
What is the general trend in atomic size within a group?within a period? within a period...it decreases In a group..it increases as atomic number increases.

Food Webs and Food Chains
Help with a forest ecosystem food chain