Tuesday

April 28, 2015

April 28, 2015

Total # Posts: 2,243

**Probability and Statistics**

The major would like to estimate the mean number of automobile crashes per day at the intersection of 2 highways. A random sample of 40 days worth of data had a mean of 4.3 crashes and a standard deviation of 0.9. How large of a sample would be needed in order to produce a 95...
*April 29, 2012*

**Probability and Statistics**

The PGA would like to test to see if there is any difference in the distance produced by Titleist and Maxfli brand golf balls. A sample of 36 Titleist golf balls produced x1bar = 292ft, s1=16ft, while a sample of 48 Maxfli golf balls produced x2bar = 281ft, s2 20ft. Find a 90...
*April 29, 2012*

**Probability and Statistics**

The school superintendent would like to estimate the proportion of adults in the country that are in favor of an increased emphasis on the basics of education. A randomly selected sample of 150 adults found that 107 of them would favor an increased emphasis on basics of ...
*April 29, 2012*

**Probability and Statistics**

The ACT scores of applicants to college are approximately normally distributed with a mean of 20.3 and a standard deviation of 3.1. If a random sample of 20 applicants to college is chosen find the probability that their average ACT score will be 19 and 21.
*April 29, 2012*

**Probability and Statistics 2**

Bad Wheels Tire Company is interested in estimating the proportion of defective tires that it produces. The company tested a sample of 500 tires and found 16 to be defective. Find a 99% upper bound confidence interval for the true proportion of defective tires produced by the ...
*April 29, 2012*

**probability and statistics**

An electrical firm manufactures light bulbs that have a usuable life that is normally distributed with a mean of 1000 hours and a standard deviation of 80 hours. Find the probability that a package of 4 bulbs would last at least 4400 hours.
*April 29, 2012*

**Probability and Statistics**

A research psychologist believes that professional athletes tend to be more confident than the typical person. From previous testing, he knows that the scores for people in the general population are approximately normally distributed with a mean of 72 and standard deviation ...
*April 29, 2012*

**precalculus**

a rectangular piece of cardboard measuring 14 inches by 27 inches is to be made into a box with an open top by cutting squares of equal size from each corner and golding up the sides . let x represent the length of a side of each square. for what value of x will the volume be ...
*April 29, 2012*

**python programming**

Explain in python programming (x^n-1)/(x-1) = x^(n-1)+x^(n-2)+...+x+1
*April 29, 2012*

**Probability and Statistics**

A marine biologist has determined that the weight of a full weight of 2000pounds and a standard deviation of 500 pounds. Determine the probability that the average weight of the next five sharks captured will be less than 2100lbs.
*April 29, 2012*

**gcse geography**

Please could someone help me with this question. 5 arguments for wild farms and 5 argumets against wild farms. thankyou for taking the time to help me.:)
*April 27, 2012*

**pre-calc**

find the exact value of the given expression. Thank you! tan(1/2cos^-1(9/10)
*April 22, 2012*

**stoichiometry**

determine the number of moles in 4.50g of MgCl2?
*April 22, 2012*

**pre-calculus**

tan(1/2)cos^-1(9/10)
*April 22, 2012*

**MATH**

What Is Three Half Of 2/6/7 ? Pleasee Help !
*April 20, 2012*

**fractions and division**

seven
*April 18, 2012*

**Physics**

a 65 kg sled starting from the rest slides down a 14 m high frictionless ramp. at the bottom of the ramp the sled encounters a level area that is not frictionless. how much work is done by friction to stop the sled?
*April 16, 2012*

**Pharmacology**

the ration 3:100 would properly be expressed in fraction form as
*April 16, 2012*

**Physics**

An unmarked police car traveling a constant 80 km/h is passed by a speeder traveling 125 km/h. Precisely 3.00 s after the speeder passes, the police officer steps on the accelerator; if the police car's acceleration is 2.40 m/s^2, how much time passes before the police car...
*April 15, 2012*

**Math**

While digging for buried treasure, chi finds 9 3/4 lb of gold coins. If the price of gold is $806 per ounce, what is the value of the coins
*April 15, 2012*

**Math**

While digging for buried treasure, chi finds 9 3/4 lb of gold coins. If the price of gold is $806 per ounce, what is the value of the coins
*April 15, 2012*

**Art**

Explain how Florence reflects the ideals of the dominant city-state and how some of the geographical, economical, social, and artistic forces shape this ideal
*April 9, 2012*

**biology**

Below the human hemoglobin sequence are the first thirty amino acid sequences of several other species’ hemoglobins. Inspect the sequences and answer the following questions: Human) h l t p e e k s a v t a l w g k v n v d e v g g e a l g r l A) ml t a e e k a a v t a f w ...
*April 1, 2012*

**Finance**

We are currently bidding on Treasury bills and have determined that we must have a 5% return for a $1,000 T-Bill that will mature in one year. How much would we be willing to bid on the Treasury bill? If we are bidding on a 13 weeks Treasury bill with a 1% return and a 26 ...
*March 30, 2012*

**Scale Representations**

123
*March 29, 2012*

**chemisrty**

what volume of hydrogen gas at STP can be produced by reacting 15.0 grams of uluminum with sulfuric acid? the equation is: 2Al+ 3H2SO4---> Al2(SO4)3+ 3H2
*March 29, 2012*

**chemistry**

what would the pressure of H2 gas collected in lab over water at 20.0 degrees celcius and 767 torr?
*March 29, 2012*

**chemistry**

FIND THE PH IF THE {H30Z+1) IS 6.2 X 10-10 M
*March 27, 2012*

**ALGREBA**

oFFICE JET PRINTERCOPY SUES DISSERTATION IN 22 MIN LASER PRINTER CAN COPY THE SAME IN 20 MIN HOW LONG WOULD IT TAKE TO TO COPY THE DISSERATION.
*March 26, 2012*

**UNIVERSITY OF PHONEX**

HELP ME WITH MATT 117 WEEK 4 QUIZ
*March 26, 2012*

**science**

At 472 deg C the reaction reaches equilibrium with the following composition: [H2]=7.38atm, [N2]=2.46atm, [NH3]=0.166atm. Into the equilibrium mixture 1.5 atm of N2 is introduced: a. Calculating Kp and Q, determine in which direction the reaction will proceed after addition of...
*March 26, 2012*

**english**

In the article, "How Lethal Was the K-T Impact?" by Richard A. Kerr and Virginia Morell, what is listed as part of the related subject matter?
*March 19, 2012*

**Physics**

An archer shoots an arrow into a piece of wood. The arrow is traveling at 120 km/h when it strikes the wood. The arrow penetrates 3.8 cm into the wood before stopping. What is its average acceleration (in m/s2) into the wood?
*March 19, 2012*

**chemistry**

if the rate of a reaction doubled with temperature increase from 30 to 40 degrees celcius, what is the activation energy
*March 19, 2012*

**Chem!!!:/**

Determine whether or not AgI will be more soluble in acidic solution than in pure water.
*March 19, 2012*

**Chemistry**

what is the mass in kilograms of 750.0mL of mercury at 25.0 C(d=13.5g/mL)
*March 19, 2012*

**geometry**

Use the Pythagorean distance formula to calculate the distance between the following points on a graph: (-7,-3) (8,-11)
*March 18, 2012*

**Algebra**

Your kids have asked you to set up a cable fromtheir tree house to the ground so that they can slide down quickly when it’s time to head in for lunch. The tree house is 12 feet from the ground. You determine that in order to get a gentle enough slope from the tree house ...
*March 18, 2012*

**Algebra**

At a local park, there is a large circular fountain feature that is 50 feet across, surrounded by a path that is 8ft wide. A father and son plan to have a “friendly” race around the path. To be fair, the father agrees to run around the outside circle of the path, and...
*March 18, 2012*

**Algebra**

At a local park, there is a large circular fountain feature that is 50 feet across, surrounded by a path that is 8ft wide. A father and son plan to have a “friendly” race around the path. To be fair, the father agrees to run around the outside circle of the path, and...
*March 18, 2012*

**algebra**

the fax corporation bought a fax machine for $700. the fax machine depreciates at a rate of $25 a month A) Find a function F that can be used to determine the value of the fax machine t months after purchase. complete the model below. F(t)=
*March 17, 2012*

**chemistry**

which pair(s) of liquids will be miscible ? H2O AND CH3CH2CH2CH2CH3(PENTANE) C6H6 (BENZENE) AND CCl4(CHLOROFORM) C2H5OH (ETHANOL) AND CH3COOH(ACETIC ACID) how do you know if they are miscible?
*March 16, 2012*

**chemistry**

which solution has highest freezing point if all are at the same molality calcium chloride sodium nitrate potassium sulfate iron(III) nitrate all have same freezing point please explain
*March 16, 2012*

**MATH!**

The mass of a radioactive substance follows an exponential decay model, with a decay rate of 5% per day. A sample of this radioactive substance was taken six days ago. If the sample has a mass of 3 kg today, find the initial mass of the sample. Round your answer to two decimal...
*March 15, 2012*

**Math**

sketch the region bounded by the graphs of f(y)=(y/Squareroot of(16-y^2)), g(y)=0, y=3 and find the area of the region.
*March 15, 2012*

**Chemistry**

2NaOH + H2SO4 -> Na2SO4 + 2H2O
*March 15, 2012*

**E.C.E**

To broaden a search
*March 15, 2012*

**Math**

Well, think of an apple pie cut in pieces (denominator). 1 slice out of 8 slices would be the smallest. Take an identical pie and cut it into 4 pieces. 3 slices out of 4 is quite a bit (75% of the pie fatso!). Get it? That is the visual way. You can also do percents. Just ...
*March 15, 2012*

**Related rate**

Ha! I figured it out. dA=8pir dr r=10 , dr=10.2 dA=8(10)(.2)pi dA=16pi (approx) check: A(10)=4(10)^2pi A(10)=400pi A(10.2)=4(10.2)^2pi A(10.2)=416.16 A(10.2)-A(10)=16.16pi (exact)
*March 14, 2012*

**Related rate**

Use differentials to find the approximate change in the surface area when the radius of the sphere is increased from 10cm to 10.2cm. I know A=4pir^2 and A' is 8pir but I'm not sure how to set it up from here. Can someone please show me all the steps involved? (This isn...
*March 14, 2012*

**english**

Not sure what the context is so include the subject(s) after "Both". Also, try "their place in" or "their position in" in place of "fitting in among". Maybe add "personal" before identity.
*March 14, 2012*

**political science**

a)
*March 14, 2012*

**Algebra**

The value of almost everything you own, such as a car, computer, or appliance, depreciates over time. When the value decreases by a fied amount each year, the depreciation is called straight-line depreciation. Suppose your car has an initial value of $16,750 and depreciates $...
*March 12, 2012*

**logic**

"P v Q" is best interpreted as
*March 12, 2012*

**Algebra**

Two companies sell software products. In 2010. Company 1 had total sales of $17.2 million. Its marketing department projects that sales will increase by $1.5 million per year for the next several years. Company 2 had total sales of $9.6 million for software products in 2010 ...
*March 11, 2012*

**Algebra**

The life expectancies for men and women in the United States can be approximated by the following formulas: Women: E= 0.126t+76.74 Men: E=0.169t+69.11 where E represents the length of life in years and t represents the year of birth,measured as number of years since 1975. a. ...
*March 11, 2012*

**Algebra**

n 1966, the U.S. Surgeon General's health warnings began appearing on cigarette packages. Data gathered after 1965 indicate that public awareness of the health hazards of smoking has had some effect on consumption of cigarettes. The percentage, p, of the total population (...
*March 10, 2012*

**Algebra**

In 1966, the U.S. Surgeon General's health warnings began appearing on cigarette packages. Data gathered after 1965 indicate that public awareness of the health hazards of smoking has had some effect on consumption of cigaretts. The percentage, p, of the total population (...
*March 10, 2012*

**Algebra**

Archaeologists and forensic scientists use the length of of human bones to estimate the height of his/her femur f(the bone from the knee to the hip socket), in centimeters using the following formulas: Male h=69.089+2.238f Female: h = 61.412+2.317f a. a partial skeleton of a ...
*March 10, 2012*

**Algebra**

The value of many things we own depreciates over time. When an asset's value decreases by a fixed amount each year, the depreciation is called straight-line depreciation. Suppose your Ford Escape from Exercise 1 depreciates $1950 per year. a.Let v represent the value of ...
*March 10, 2012*

**Business Law**

As company ombudsman, your task is to investigate complaints of wrongdoing on the part of corporate directors and officers, decide whether there is a violation of the law, and deal with the wrongdoers accordingly, Jane, a shareholder of Goodly Corporation, alleges that its ...
*March 9, 2012*

**Business Law**

As company ombudsman, your task is to investigate complaints of wrongdoing on the part of corporate directors and officers, decide whether there is a violation of the law, and deal with the wrongdoers accordingly, Jane, a shareholder of Goodly Corporation, alleges that its ...
*March 9, 2012*

**Business Law**

As company ombudsman, your task is to investigate complaints of wrongdoing on the part of corporate directors and officers, decide whether there is a violation of the law, and deal with the wrongdoers accordingly, Jane, a shareholder of Goodly Corporation, alleges that its ...
*March 8, 2012*

**Pre-Cal**

given the function y=2sin3x-1, identify the following below. also show its graph for the primary cycle. (identifying parts of a trig. equation) asymptotes= k= c= axis= primary cycle= period=
*March 6, 2012*

**Pre-Cal**

solve and round your answer to 4 dec. sinx= .4 in [0,2pi] secx= -3 in [0,pi]
*March 6, 2012*

**pre-cal**

5 t values used to graph (called key pts or inflection pts) and primary cycle? 1) y=2sin(x-pi) 2) y=-sin3x-2 3) -3cos(1/2x+pi/3)+1 4) cospi(x-1)
*March 5, 2012*

**geometry**

The diameter of Earth is 12,742 kilometers; the diameter of the moon is 3476 kilometers. a. If you flew around Earth by following the equator at a height of 10 kilometers, how many trips around the Moon could you take in the same amount of time, at the same height from the ...
*March 4, 2012*

**geometry**

A flower bed in the corner of your yard is in shape of a right triangle. The perpendicular sides of the bed measure 6 feet 8 inches and 8 feet 4 inches. Calculate the area of the flower bed.
*March 4, 2012*

**geometry**

you want to buy a pickup truck and are interested in one with a large carrying capacity. One model features a rectangular prism-shaped cargo space, measuring 6ft by 10ft by 2ft;another has a space with dimensions 5ft by 11ft by 3ft. Which truck provides you with most carrying ...
*March 4, 2012*

**geometry**

you want to buy a pickup truck and are interested in one with a large carrying capacity. One model features a rectangular prism-shaped cargo space, measuring 6ft by 10ft by 2ft;another has a space with dimensions 5ft by 11ft by 3ft. Which truck provides you with most carrying ...
*March 4, 2012*

**geometry**

you want to buy a pickup truck and are interested in one with a large carrying capacity. One model features a rectangular prism-shaped cargo space, measuring 6ft by 10ft;another has a space with dimensions 5ft by 11ft by 3ft. Which truck provides you with most carrying ...
*March 3, 2012*

**geometry**

Hot air balloons require large amounts of both hot air and fabric material. A hot air balloon is spherical with a diameter of 25 feet . a. Does finding the surface area help you determine the amount of the hot air or the fabric material? Explain
*March 3, 2012*

**geometry**

You are buying a ladder for your 30-foot-tall house. for safety, you would like to ensure that the base of the ladder be placed at least 8 foot from the base of the house. What is the shorest ladder you can buy in order to be able to reach to top of your house?
*March 3, 2012*

**geometry**

Tree stands 25 feet tall and 15 feet wide base 7.5 feet . You want to hang strings of lights from top to bottom on the outside. How long should each string be?
*March 3, 2012*

**Chemistry**

What is the molarity of an aqueous ammonia solution that has an OH- concentration of 0.0011 M? Kb = 1.8x10-5
*March 2, 2012*

**Chemistry**

What is the molarity of an aqueous ammonia solution that has an OH- concentration of 0.0011 M? Kb = 1.8x10-5
*March 2, 2012*

**Pre-Cal**

This exercise is based on the following table, which lists interest rates on long-term investments (based on 10-year government bonds) in several countries in 2008. Assuming that you invest $9,000 in the United States (3.9%), how long (to the nearest year) must you wait before...
*February 29, 2012*

**math**

A scale model racing car is 11 inches long, 3 inches wide, and 2 inches tall. The actual racing car is show at the right. How wide is the actual racing car?
*February 28, 2012*

**chemistry**

A sample of gas has an initial volume of 14.7L at a pressure of 1.02 atm. If the sample is compressed to a volume of 10.2L, what will its pressure be?
*February 28, 2012*

**Chemistry**

how do u complete these questions? 2HCI(aq)+Pb(NO3)2(aq)---> 2HI(aq)+K2SO3(s)---> Pb(NO3)2(aq)+2KCI(aq)---> Ba(NO3)2(aq)+Na2SO4(aq)---> K2CO3(aq)+Ba(NO3)2(aq)---> HCI(aq)+AgNO3(aq)--->
*February 28, 2012*

**math**

how much money do i need for simple interest for $2000 at 5% interest in 2 years?
*February 27, 2012*

**Math**

x+y=5 x-y=3 Please help me solve this system of equation and show your work thanks
*February 24, 2012*

**algebra**

solve by the substitution method. 6x+3y=-21 -4x+y=41
*February 24, 2012*

**statistics**

1.25
*February 24, 2012*

**Math**

6-1/5y is less than or equal to 7 Please help me solve this and show your work thanks.
*February 22, 2012*

**Math**

Evaluate the following expressions: A.) P(105,1) B.) P(10,4) C.) P(11,3)
*February 21, 2012*

**INF 336: Project Procurement **

a. Why is it preferable to separate need identification and defining commercial equivalents into two separate stages? b. Why is early supply/supplier important? c. What are the disadvantages of specifying by performance? What are the advantages? d. How does a supply ...
*February 21, 2012*

**eng 225**

Which of the following leads to the deepest appreciation of a film? (Points : 1) Turning off your brain completely and letting life’s pressures slip away Paying attention to what a film is trying to say Learning the technical names of a film’s elements Learning the ...
*February 19, 2012*

**eng 22**

Which of the following leads to the deepest appreciation of a film? Turning off your brain completely and letting life’s pressures slip away Paying attention to what a film is trying to say Learning the technical names of a film’s elements Learning the roles of the ...
*February 19, 2012*

**algebra**

Factor completely. 25a^2-64
*February 13, 2012*

**pre-algebra**

One side of a rectangle is 6 in and the other side is x inches. Find the possible value of x if the area must be at least 84 sq inches.
*February 9, 2012*

**Chemistry**

Time(seconds) 0 200 500 800 1200 1500 [A in Moles] .184 .129 .069 .031 .019 .016 What is the instantaneous rate of the reaction at t= 800 seconds?
*February 9, 2012*

**Chemistry**

A flask is charged with 0.100 mol of A and allowed to react to form B according to the hypothetical gas-phase reaction A(g)--> B(g) The following data are collected: Time (s) 0 40 80 120 160 Moles of A .100 .067 .045 .030 .020
*February 9, 2012*

**Physics **

A rescue plane wants to drop supplies to isolated mountain climbers on a rocky ridge H = 231 m below. If the plane is traveling horizontally with a speed of 227 km/h (63.1 m/s), how far in advance of the recipients (horizontal distance) must the goods be dropped? 433m Suppose...
*February 7, 2012*

**Math**

I have to solve the equation by finding a common base. 9^(x2-1)= 1/27^x Do i cross multiply and solve for x?
*February 4, 2012*

**algebra**

you can rent a boogie board at tybee island for a $ 10 flat fee plus $.50 for each hour.The situation can be modeled by a linear eqution.What is the slope
*January 31, 2012*

**central highschool**

ken's cartoons for the school newspaper, but they wouldn't be good
*January 26, 2012*

**geometry**

need help with pythagorean theoren
*January 25, 2012*

**math**

Shane invests $7,000 in bonds that earn simple interest of 3%. The interest is payable at the maturity of the bonds after 5 years. Find the total amount that Shane will receive at the end of 5 years.
*January 25, 2012*

**electrochemistry**

How do I determine the standard potential for an aluminum half cell? Can someone please explain to me how I do this? like what are the steps? thanks
*January 25, 2012*