Monday
December 22, 2014

Posts by andrew


Total # Posts: 1,000

Statistics
Oh no.. Maybe the correct answer is A!!
July 26, 2013

Statistics
Multiple Choice Which of the following statements is true about the 95% confidence interval of the average of a sample? A) 95 of 100 avgs of samples will be within the limits of the confidence interval. B) There is a 95% chance the avg of the population to be within the limits...
July 26, 2013

Statistics
I forgot to state my answer. 1) True 2) False 3) True 4) False. Do you agree?
July 26, 2013

Statistics
True or False Questions. Statistics' students of a class of Lyceum want to calculate the average number of chocolate pieces in a standard package of biscuits SANTAS. They choose a random sample of biscuits, measure chocolate pieces in each cookie and calculate the 95% ...
July 26, 2013

Statistics
Any ideas please? Simple random sample of voters will be taken in a large state. Researchers will construct an approximate 95% confidence interval for the percent of the state¢s voters who will vote for Candidate A. Find the minimum sample size needed to ensure that the ...
July 24, 2013

Statistics
I believe that: a) is False b) is True c) Is False. Any suggestions?
July 22, 2013

Statistics
True or False Question. I need help please. A sientific paper reports the results of a drug test. This medicine used to reduce vision loss in people suffering from macular degeneration. The article state p = 0,04 section findings. The following issues are of three different ...
July 22, 2013

chem 103
Question..where to start..If you had 250.0 g of copper (specific heat = 0.385), what temperature could you raise it to (starting from 20 degrees C) if you heated it with 1685 Joules of energy? If I use the formula q=MxCsX^T, How do I find ^T if I do not have a Tf, assuming 20....
July 21, 2013

Statistics
Yeah... I think you are absolutely correct. Also from the city is very possible to be there in 10 minutes so he will pay more for the parking. I changed my mind... Thank you a lot.
July 20, 2013

Statistics
S. Sue, Thank you. To be honest i was not sure about c.. I am between a and c.. More positive on c.. Are you sure?
July 20, 2013

Statistics
I need help with this please. It is a multiple choice question, so choose one from a,b,c please. I believe the correct is c. What do you think? Ari lives about 10 minutes away from the college to which he intend to attend a summer seminar of 10 weeks. There are two main routes...
July 20, 2013

Statistics
Thank you very much PsyDAG. can you help me with the other one i posted related to this please? (multiple choice)
July 20, 2013

Statistics
I need help with this please. A researcher is designing a research study. He hopes to show that the results of an experiment are statistically significant. What size of p value would take? a) Large value of p b) Small value of p c) The size of the p value does not affect the ...
July 20, 2013

Statistics
An environmentalist do a study to investigate the effects of a specific herbicide in fish. Has 60 healthy fish and randomly distributes any fish or in the experimental group or the control group. The fish in the experimental group have higher indices enzymes. 1) Suppose that ...
July 19, 2013

Statistics
Dear MathMate, Thank you for the paper it will be very usefull for me! As I understand from this paper i was correct? a) is False b) is True c) Is False. Thank you in advance.
July 19, 2013

Statistics
Hello PsyDAG. I do not know. The question is given exactly as you see. I believe that this is tricky. Maybe wants to think that of course the demand of the researchers is the medicine is effective. So the null hypothesis is exactly the opposite (no difference). Do you agree? ...
July 19, 2013

Statistics
A research article reports the results of a drug test. This medicine used to reduce vision loss in people suffering from macular degeneration. The article state p = 0,04 section findings. The following issues are of three different interpretations of this value p. Note which ...
July 19, 2013

math
Padding 7 miles upstream, Steven and his brother averaged 2 miles per hour. On the way back, their rate of speed was 3 1/2 miles per hour. How long did it take them to make the round trip?
July 16, 2013

math
A computer train travels the distance from Acton to Boston in 1 hour and 10 minutes. If the train is traveling at an average speed of 48 miles per hour, what is the distance between the two cities?
July 16, 2013

chem 103
Thank you for your time! Obviously I need to review the equation set-ups again. You were very helpful!
July 14, 2013

chem 103
Thank you so much! Now for the second part of the question. How many ml of that stock solution would you need to prepare 175 ml of 0.750 M diluted Na3PO4 solution? My answer is 4.27 ml of stock solution. Is that correct? Thank you. If yes , the next part of the question is: if...
July 14, 2013

chem 103
Still stuck on this question. How many grams of Na3PO4 would you need to make 0.225L of 8.0M stock solution? 8.0 M of NaPo multiplied by .225L NaPO = 1.8 mols of Na3PO4. Then multiply the 1.8 mol times the mass of Na3PO4 which is 163.93 grams?, yes? This would make 295.07 ...
July 14, 2013

algebra 2
sorry ax-bx=2a
July 11, 2013

algebra 2
solve equation for x atate any restrections ax-bx+2a
July 11, 2013

College 103 Chem
How many grams of Sodium Phosphate would you need to make 225ml of 8.00M of stock solution? Thank you
July 10, 2013

Math
CHEATER!!!!! do not answer this. this is an ongoing problem on brilliant . org. Be ashamed of yourself, "best".
June 18, 2013

physics
A car is hauling a 89 kg trailer, to which it is connected by a spring. The spring constant is 2100 N/m. The car accelerates with an acceleration of 0.29 m/s2. By how much does the spring stretch?
June 14, 2013

pls heeelp math
Please stop cheating, mathslover. I will delete your account on Brilliant if you continue this behavior. -Calvin
June 7, 2013

plls heeeeeeelp math
How many ordered pairs of positive integers 1≤k≤n≤50 are there, such that k divides n, and (n/k )!= n!/k! ?
June 4, 2013

heeeeeeeeelp math
is it ? are you know my Brilliant Accout? hahaha freaking stupid threat
June 3, 2013

heeeeeeeeelp math
How many ordered pairs of positive integers 1≤k≤n≤50 are there, such that k divides n, and (n/k )!= n!/k! ?
June 3, 2013

heeelp tooough physics
A tunable capacitor (with variable capacitance) is charged by a U 0=12 V battery and then is connected in parallel to a R=3 Ω resistor. The capacitance C(t) of the capacitor is controlled so that the current in the circuit remains constant at all times. What is the power...
June 1, 2013

heeeeeeelp geometry
In a triangle ABC, BK is an angle bisector. A circle with radius 5/3 passes through the vertex B, intersects AB at a point L, and is tangent to AC at K. It is known that the length of AC is 3√3, and the ratio of the lengths |AK| to |BL| is 6:5. The area of the triangle ...
June 1, 2013

heeeeeeeeeelp math
Miles has 4 Lego people in his Lego town. A Lego person consists of exactly 1 set of legs, a torso, and a head. All of these body parts are distinct. Miles' son comes in and takes apart the Lego people. How many different sets of 4 Lego people can be created from the pieces?
June 1, 2013

heeeeeeeeeeeeelp math
ur answer was wrong
June 1, 2013

heeeeeeeeeeeeelp math
Miles has 4 Lego people in his Lego town. A Lego person consists of exactly 1 set of legs, a torso, and a head. All of these body parts are distinct. Miles' son comes in and takes apart the Lego people. How many different sets of 4 Lego people can be created from the pieces?
June 1, 2013

heeeeeeeelp math
Let x,y,z be non-negative real numbers satisfying the condition x+y+z=1 . The maximum possible value of x^3*y^3+y^3*z^3+z^3*x^3 has the form a/b where a and b are positive, coprime integers. What is the value of a+b ?
May 31, 2013

heeeeeeelp math
Miles has 4 Lego people in his Lego town. A Lego person consists of exactly 1 set of legs, a torso, and a head. All of these body parts are distinct. Miles' son comes in and takes apart the Lego people. How many different sets of 4 Lego people can be created from the pieces?
May 30, 2013

heeeelp physics
A tunable capacitor (with variable capacitance) is charged by a U 0=12 V battery and then is connected in parallel to a R=3 Ω resistor. The capacitance C(t) of the capacitor is controlled so that the current in the circuit remains constant at all times. What is the power...
May 30, 2013

pllllls heeeeeeeeelp math
Let x,y,z be non-negative real numbers satisfying the condition x+y+z=1 . The maximum possible value of x^3*y^3+y^3*z^3+z^3*x^3 has the form a/b where a and b are positive, coprime integers. What is the value of a+b ?
May 30, 2013

math plllls heelp
How many integers 1≤N≤1000 can be written both as the sum of 26 consecutive integers and as the sum of 13 consecutive integers?
May 29, 2013

heeeeeeeeeeeeeeeeeeeelp maths
In triangle ABC, points D,E,F are on sides BC,CA,AB respectively such that AD,BE,CF are angle bisectors of triangle ABC. The lines AD,BE,CF are concurrent at I, the incenter of triangle ABC. If ∠BAC=92∘, what is the measure (in degrees) of ∠EIF?
May 28, 2013

help math
In triangle ABC, points D,E,F are on sides BC,CA,AB respectively such that AD,BE,CF are angle bisectors of triangle ABC. The linesAD,BE,CF are concurrent at I,the incenter of triangle ABC. If Angle BAC=90, what is the measure (in degrees) of Angle EIF?
May 28, 2013

help maths
f(x) is a cubic polynomial such that f(n)=1/n^2+1 for n=1,2,3,4. If f(0)=a/b,where a and b are coprime positive integers, what is the value of a+b
May 28, 2013

geometry
A rectangular prism has a volume of 250 cubic cm.What would the volume be if one dimension stayed the same, a second dimension was three times as long, and the third was twice as long?
May 23, 2013

Probability
Andrew has ten different two-player board games on his shelf. He has them numbered 1 through 10. When he plays the game i against Diego, he has a i^2/100 chance of winning. If Andrew rolls a fair ten-sided die to determine which game to play, the probability that he will win ...
May 20, 2013

Geometry
ABC is a triangle with a right angle at A. M and N are points on BC such that AM is the altitude, and AN is the angle bisector of ÚBAC. If CN/NB =21 , what is CM/MB ?
May 16, 2013

Algebra
Suppose x and y are real numbers and 4x+3xi+yi−43=2y+2xi−x+2yi+5i . What is the product xy .
May 15, 2013

Science
Two point charges +q=1 ìC and −q=−1 ìC with mass m=1 g are fixed at the positions ±r ⃗ 0 with |r 0 |=1 m . The charges are released from rest at t=0 . Find the time ô in seconds at which they collide.
May 15, 2013

math
what is a pentagon
May 13, 2013

algebra
4x-3y=24
April 28, 2013

Statistics
help
April 24, 2013

accounting
Ziegler Corporation purchased 25,000 shares of common stock of the Sherman Corporation for $40 per share on January 2, 2010. Sherman Corporation had 100,000 shares of common stock outstanding during 20 I3, paid cash dividends of $120.000 during 20 I3, and reported net income ...
April 20, 2013

College Physics
A uniform ladder of mass, m, and length, l, leans at an angle, theta, against a frictionless wall. Determine a formula for the minimum angle at which the ladder will not slip.
April 20, 2013

College Physics
A large 61.0 kg board is propped at a 45 degree angle against the edge of a barn door 2.9m wide. How great a horizontal force must a person behind the door exert (at the edge) in order to open it? Assume that there is negligible friction between the door and the board but that...
April 20, 2013

College Physics
A cubic crate of side s=2.0m is top-heavy: its CG is 18cm above its true center. Part A) How steep an incline can the crate rest on without tipping over? Part B) What would your answer be if the crate were to slide at constant speed down the plane without tipping over? (The ...
April 20, 2013

chemistry
URGENT THANKYOU
April 17, 2013

chemistry
C2H5OH+O2-CH3COOH+H2O HOW MANY MOLES OF ETHANOL IN 5g
April 17, 2013

language arts & writing
probably c if i were to guess
April 15, 2013

chemistry (electrochemistry)
1) For the following electrochemical cell Cu(s)|Cu2 (aq, 0.0155 M)||Ag (aq, 1.50 M)|Ag(s) write the net cell equation. Calculate the following values using standard potentials as needed. Eo cell and dGo for each reaction...
April 15, 2013

chemistry
A current of 3.78 A is passed through a Pb(NO3)2 solution for 1.40 hours. How much lead is plated out of the solution?
April 15, 2013

accounting
Hillsborough Co. has an available-for-sale investment in the bonds of Schuyler with a carrying (and fair) value of $ 85,540. Hillsborough determined that due to poor economic prospects for Schuyler, the bonds have decreased in value to $ 59,710. It is determined that this loss...
April 14, 2013

accounting
Rushia Company has an available-for-sale investment in the 10%, 10-year bonds of Pear Co. The investment’s carrying value is $3,200,000 at December 31, 2010. On January 9, 2011, Rushia learns that Pear Co. has lost its primary manufacturing facility in an uninsured fire. ...
April 14, 2013

Algebra
a,b,c are positive integers such that a:b=7:9 and b:c=12:7 . What is the smallest possible value of a ?
April 11, 2013

math
Thank you sir
March 31, 2013

math
Hi ! Here is my question: The pythagorean theorem gives the relationships between the sides of a right triangle. The following identities show the relationships between the trigonometric functions of a particular angle. sin^2(theta) + cos^2(theta) = 1 tan^2(theta) + 1 = sec^2(...
March 31, 2013

math
find the monthly payment for the loan. Finance $ 750.000 for a warehouse with a 9.50% 30 year loan.
March 17, 2013

math
thank you I got this 65.89
March 17, 2013

math
Ms Sue where did you add 5%
March 17, 2013

math
Ms Sue What about 15% installment loan
March 17, 2013

math
Karen and Wayne need to buy a refrigerator because theirs just broke. Unfortunately, their savings account is depleted, and they will need to borrow money in order to buy a new one. Sears offers them an installment loan at 15% (add-on rate). If the refrigerator at Sears costs...
March 17, 2013

math
Thank you for help.
March 17, 2013

math
Find the number of decibels for the power of the sound given. Round to the nearest decibel. A rocket engine, 2.65 times 10^-5 watts/cm^2
March 17, 2013

math
Find the number of decibels for the power of the sound given. Round to the nearest decibel. A rocket engine, 2.65 times 10^-5 watts/cm^2
March 16, 2013

math
Thank you for your help.
March 15, 2013

math
Thank you for answering my question.But I really do not know what happend to the 4 in front of the equation?
March 15, 2013

math
4 In e= In (ã(3))/(x)-4 In e Solve the equations by finding the exact solution.
March 15, 2013

Chemistry
I just tried that and it told me the answer was incorrect. It gave a hint saying In acidic solution, use the reaction given for the solvation of CaCO3 in acidic solution. Construct a concentration table that allows for the calculation of final concentration as if the reaction ...
March 11, 2013

Chemistry
Compare the g/L solubility of CaCO3 in pure water, a H3O+ (aq) solution with a PH of 3.00 and a H30+(aq) solution with a pH of 1.00. Ksp for CaCO3 is 3.36 x 10^-9 CaCO3 (s) + H3O (aq) = Ca (aq) + HCO3 (aq) + H2O (l) (equilibrium equation) Keq= 71 I knew how to do this for pure...
March 11, 2013

chemistry
Chlorine gas is collected in a gas collecting tube above water. The gas is at 20oC and the total pressure in the tube is 755 mmHg. What is the pressure (in mmHg) of chlorine gas in the tube?
March 11, 2013

math
The breaking strength (in pounds) of a certain new synthetic is normally distributed with a mean of 175 and a variance of 4. The material is considered defective if the breaking strength is less than 170 pounds. What is the probability that a single, randomly selected piece of...
March 10, 2013

Physics
Your grandfather clock’s pendulum has a length of 0.9930 m. If the clock loses 95.6 seconds per day, by how many millimeters should you adjust the length of the pendulum?
March 10, 2013

Physics
What is the period of a simple pendulum 83 cm long on the Earth?
March 10, 2013

Physics
A pendulum has a period of 4.28 s on Earth. What is its period on Mars, where the acceleration of gravity is about 0.37 that on Earth?
March 10, 2013

math
Suppose that people's heights (in centimeters) are normally distributed, with a mean of 170 and a standard deviation of 5. We find the heights of 80 people. (a) How many would you expect to be between 170 and 175 cm tall? (b) How many would you expect to be taller than 179...
March 10, 2013

Literature
I'm doing a literary analysis of Mark Twain's "The Private History of a Campaign that Failed" and I'm having a hard time coming up with a good these statement... Any suggestions?
March 6, 2013

probability
the probability of drawing a club from a deck of card is 1/4 what are the odds in favor of drawing a club from an ordinary deck of cards?
March 3, 2013

math
An advertising agency conducted a survey and found that the number of units sold, N, is related to the amount 'a' spent on advertising (in dollars) by the following formula: N= 1,500 + 400 ln a ( a ¡Ý 1 ) How many units are sold after spending $ 1,000 (to ...
March 3, 2013

math
calculate the monthly finance charge for the credit card transaction. Assume that it takes 10 days for a payment to be received and recorded and that the month is 30 days long. ( round your answers to the nearest cent). $ 400 balance, 15%, $ 50 payment. A) previous balance ...
March 3, 2013

math
calculate the monthly finance charge for the credit card transaction. Assume that it takes 10 days for a payment to be received and recorded and that the month is 30 days long. ( round your answers to the nearest cent). $ 400 balance, 15%, $ 50 payment. A) previous balance ...
March 3, 2013

math
Classify the finacial problem. Assume a 7% interest rate compounded annually. Find the value of a $ 1,000 certificate in 4 years. a) sinking fund, b) ordinary annuity, c) future value, d) present value e) amortization
March 3, 2013

math
Classify the finacial problem. Assume a 7% interest rate compounded annually. Find the value of a $ 1,000 certificate in 4 years. a) sinking fund, b) ordinary annuity, c) future value, d) present value e) amortization.
March 2, 2013

math
Classify the finacial problem. Assume a 7% interest rate compounded annually. Find the value of a $ 1,000 certificate in 4 years. a) sinking fund, b) ordinary annuity, c) future value, d) present value e) amortization.
March 2, 2013

math
calculate the monthly finance charge for the credit card transaction. Assume that it takes 10 days for a payment to be received and recorded and that the month is 30 days long. ( round your answers to the nearest cent). $ 400 balance, 15%, $ 50 payment. A) previous balance ...
March 2, 2013

math
find the monthly payment fot the loan. $ 500 loan for 12 months at 13%
March 2, 2013

math
calculate the monthly finance charge for the credit card transaction. Assume that it takes 10 days for a payment to be received and recorded and that the month is 30 days long. ( round your answers to the nearest cent). $ 400 balance, 15%, $ 50 payment. A) previous balance ...
March 2, 2013

Math
3) Bobby Ray brought 14 gallons of green punch to a St Patrick’s Day party. He wanted to fill each cup with 2/3 of punch. How many people got a cup of punch? _______________
February 28, 2013

us history
How did the Supreme Court rule on the Indian Removal Act? is it Jackson's order to move the Indians west was unconstitutional. or The Indian Removal Act was unconstitutional.
February 24, 2013

math
Assume the car can be purchased for 0% down for 60 months (in lieu of rebate). A car with a sticker price of $42,500 with factory and dealer rebates of $5,100 (a) Find the monthly payment if financed for 60 months at 0% APR. (Round your answer to the nearest cent.) $ (b) Find ...
February 24, 2013

us history
plz someone give me the answer ive read m book over and over i cant find the answer to why is new orleans important
February 23, 2013

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