Friday

May 6, 2016
Total # Posts: 1,116

**physics**

A roller coaster at an amusement park has a dip that bottoms out in a vertical circle of radius 11.0 m. A passenger feels the seat of the car pushing upward on her with a force equal to three times her weight at the bottom of the dip. What is her speed as she goes through the ...
*July 29, 2013*

**Statistics**

True or False. Help please! 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 28, 2013*

**Statistics**

I am confused.. maybe is D. I am copying this paragraph from wikipedia. Meaning and interpretation[edit] For users of frequentist methods, various interpretations of a confidence interval can be given. The confidence interval can be expressed in terms of samples (or repeated ...
*July 26, 2013*

**Statistics**

Thank you PsyDAG. Are yousure about B? I believe that B is correct but maybe A is correct. I have to choose only one.. You believe B is absolutely correct?? Can you help me and with the other one please?
*July 26, 2013*

**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*

**Statistics and Research Methods**

reject
*April 4, 2013*

**help making equations**

Jeb has to pay a plumber $65 to come to his house and $40 per hour after that. Write an equation for the cost (y) based on the number of hours (x)
*April 2, 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*